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When 2D materials meet metals 2D Mater. (IF 5.5) Pub Date : 2024-02-23 Luka Pirker, Jan Honolka, Matěj Velický, Otakar Frank
This review delves into the intricacies of the interfaces formed between two-dimensional (2D) materials and metals, exploring a realm rich with fundamental insights and promising applications. Historically, our understanding of 2D materials emanated from studies employing dielectric substrates or suspended samples. However, integrating metals in the exfoliation and growth processes of 2D materials
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Flux-pinning mediated superconducting diode effect in NbSe2/CrGeTe3 heterostructure 2D Mater. (IF 5.5) Pub Date : 2024-02-22 A Mehrnejat, M Ciomaga Hatnean, M C Rosamond, N Banerjee, G Balakrishnan, S E Savel’ev, F K Dejene
In ferromagnet/superconductor bilayer systems, dipolar fields from the ferromagnet can create asymmetric energy barriers for the formation and dynamics of vortices through flux pinning. Conversely, the flux emanating from vortices can pin the domain walls of the ferromagnet, thereby creating asymmetric critical currents. Here, we report the observation of a superconducting diode effect (SDE) in a NbSe2/CrGeTe3
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Klein tunneling degradation and enhanced Fabry-Pérot interference in graphene/h-BN moiré-superlattice devices 2D Mater. (IF 5.5) Pub Date : 2024-02-21 Viet-Anh Tran, Viet-Hung Nguyen, Jean-Christophe Charlier
Hexagonal boron-nitride (h-BN) provides an ideal substrate for supporting graphene devices to achieve fascinating transport properties, such as Klein tunneling, electron optics and other novel quantum transport phenomena. However, depositing graphene on h-BN creates moiré superlattices, whose electronic properties can be significantly manipulated by controlling the lattice alignment between layers
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Search on stable binary and ternary compounds of two-dimensional transition metal halides 2D Mater. (IF 5.5) Pub Date : 2024-02-14 Dzmitry Ch Hvazdouski, Мaryia S Baranava, Elena A Korznikova, Andrey A Kistanov, Viktor R Stempitsky
Ab initio driven density functional theory-based high throughput simulations have been conducted to search for stable two-dimensional (2D) structures based on transition metal halides. Binary MeX2 and MeXY (Me—transition element, X and Y–Cr, Br, I, where X ≠ Y) 2D structures in two structural polymorphic modifications, which are 1T-phase and 1H-phase, have been studied. The main structural stability
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New twisted van der Waals fabrication method based on strongly adhesive polymer 2D Mater. (IF 5.5) Pub Date : 2024-02-13 Giung Park, Suhan Son, Jongchan Kim, Yunyeong Chang, Kaixuan Zhang, Miyoung Kim, Jieun Lee, Je-Geun Park
Observations of emergent quantum phases in twisted bilayer graphene prompted a flurry of activities in van der Waals (vdW) materials beyond graphene. Most current twisted experiments use a so-called tear-and-stack method using a polymer called polypropylene carbonate (PPC). However, despite the clear advantage of the current PPC tear-and-stack method, there are also technical limitations, mainly a
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Superconductivity and electron self-energy in tungsten-sulfur-hydride monolayer 2D Mater. (IF 5.5) Pub Date : 2024-02-13 J Seeyangnok, M M Ul Hassan, U Pinsook, G J Ackland
Hydrogen-rich structures have recently gained attention as a candidate for room-temperature superconductors. Hydrogen has high phonon frequencies and can be an ideal component for superconductors if it also exhibits strong electron–phonon coupling. In bulk materials, this has been achieved only under very high pressure. Two-dimensional hydrogen-decorated materials can also be expected to become superconductors
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Dipolar interactions enhanced by two-dimensional dielectric screening in few-layer van der Waals structures 2D Mater. (IF 5.5) Pub Date : 2024-02-13 Yuhang Hou, Hongyi Yu
We theoretically examined how the dielectric screening of two-dimensional (2D) layered materials affects the dipolar interaction between interlayer excitons (IXs) in few-layer van der Waals structures. Our analysis indicates that the dipolar interaction is largely enhanced by 2D dielectric screening at an inter-exciton separation of several nanometers or larger. The underlying mechanism can be attributed
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X-ray photoelectron diffraction as a modern tool for determining surface stacking sequence in layered materials 2D Mater. (IF 5.5) Pub Date : 2024-02-12 L H de Lima, A de Siervo
We investigated the surface structure of a NbSe2 single crystal at room temperature, using angle-scanned x-ray photoelectron diffraction (XPD) combined with multiple scattering calculations. Different stacking sequences were tested (1T, 2H a , 2H c , and 3R), including possible stacking faults and a mixed 2H–3R stacking proposed earlier in the literature. We confirm the capability of XPD to distinguish
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Monolayer WS2 electro- and photo-luminescence enhancement by TFSI treatment 2D Mater. (IF 5.5) Pub Date : 2024-02-08 A R Cadore, B L T Rosa, I Paradisanos, S Mignuzzi, D De Fazio, E M Alexeev, A Dagkli, J E Muench, G Kakavelakis, S M Shinde, D Yoon, S Tongay, K Watanabe, T Taniguchi, E Lidorikis, I Goykhman, G Soavi, A C Ferrari
Layered material heterostructures (LMHs) can be used to fabricate electroluminescent devices operating in the visible spectral region. A major advantage of LMH-based light emitting diodes (LEDs) is that electroluminescence (EL) emission can be tuned across that of different exciton complexes (e.g. biexcitons, trions, quintons) by controlling the charge density. However, these devices have an EL quantum
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Transfer doping of epitaxial graphene on SiC(0001) using Cs 2D Mater. (IF 5.5) Pub Date : 2024-02-02 Fabian Göhler, Philip Schädlich, Niels Rösch, Mike Zeißig, Thomas Seyller
Control of the charge carrier concentration is essential for applications of graphene. Here, we demonstrate the doping of epitaxial graphene on SiC(0001) via charge transfer from an adsorbed layer of Cs atoms with sub-monolayer coverage. The electronic structure of the graphene is analyzed using x-ray and angle-resolved photoelectron spectroscopy. In H-intercalated, quasi-freestanding monolayer graphene
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Ferroelectricity in twisted double bilayer graphene 2D Mater. (IF 5.5) Pub Date : 2024-02-01 Renjun Du, Jingkuan Xiao, Di Zhang, Xiaofan Cai, Siqi Jiang, Fuzhuo Lian, Kenji Watanabe, Takashi Taniguchi, Lei Wang, Geliang Yu
Two-dimensional (2D) ferroelectrics can maintain electrical polarization up to room temperature and are, therefore, promising for next-generation nonvolatile memories. Although natural 2D ferroelectrics are few, moiré superlattices provide us with a generalized method to construct ferroelectrics from non-ferroelectric parent materials. We report a realization of ferroelectric hysteresis in an AB-BA
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Unraveling the mechanism of vanadium self-intercalation in 1T-VSe2: atomic-scale evidence for phase transition and superstructure model for intercalation compound 2D Mater. (IF 5.5) Pub Date : 2024-02-01 Daliang He, Bo Wang, Wang Cao, Yongjun Jiang, Sheng Dai, Wei Zhao, Xiaodong Cui, Chuanhong Jin
Self-intercalation is an efficient strategy for tailoring the property of layer structured materials like transition metal dichalcogenides (TMDCs), while the associated kinetics and mechanism remain scarcely explored. In this study, we investigate the atomic-scale dynamics and mechanism of vanadium (V) self-intercalation in multi-layer 1T-VSe2 using in situ high resolution scanning transmission electron
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Graphene Roadmap Briefs (No. 3): meta-market analysis 2023 2D Mater. (IF 5.5) Pub Date : 2024-01-31 Thomas Schmaltz, Lorenzo Wormer, Ulrich Schmoch, Henning Döscher
Graphene and related materials (GRMs) promise ample application potential throughout numerous industries. A dedicated graphene market gradually forms around emerging suppliers aspiring to satisfy future demands. Its growth critically depends on the interplay of supply stream maturation and initial utilizations to drive the demand. The present issue of Graphene Roadmap Briefs provides quantitative insights
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The deep-acceptor nature of the chalcogen vacancies in 2D transition-metal dichalcogenides 2D Mater. (IF 5.5) Pub Date : 2024-01-30 Shoaib Khalid, Bharat Medasani, John L Lyons, Darshana Wickramaratne, Anderson Janotti
Chalcogen vacancies in the semiconducting monolayer transition-metal dichalcogenides (TMDs) have frequently been invoked to explain a wide range of phenomena, including both unintentional p-type and n-type conductivity, as well as sub-band gap defect levels measured via tunneling or optical spectroscopy. These conflicting interpretations of the deep versus shallow nature of the chalcogen vacancies
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Exploring graphene-substrate interactions: plasmonic excitation in Sn-intercalated epitaxial graphene 2D Mater. (IF 5.5) Pub Date : 2024-01-25 Zamin Mamiyev, Christoph Tegenkamp
Graphene plasmons, including those in intercalated graphene, are an important research focus, with the promise of enabling light manipulation and providing a unique platform for gaining fundamental insights into many-body electronic interactions. In the present work, we discuss the results of low-energy plasmonic excitations in epitaxial quasi-free monolayer graphene formed by intercalation of Sn beneath
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Scanning tunneling microscopy study of epitaxial Fe3GeTe2 monolayers on Bi2Te3 2D Mater. (IF 5.5) Pub Date : 2024-01-25 Brad M Goff, Wenyi Zhou, Alexander J Bishop, Ryan Bailey-Crandell, Katherine Robinson, Roland K Kawakami, Jay A Gupta
Introducing magnetism to the surface state of topological insulators, such as Bi2Te3, can lead to a variety of interesting phenomena. We use scanning tunneling microscopy (STM) to study a single quintuple layer (QL) of the van der Waals magnet Fe3GeTe2 (FGT) that is grown on Bi2Te3 via molecular beam epitaxy. STM topographic images show that the FGT grows as free-standing islands on Bi2Te3 and outwards
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Raman spectroscopy of monolayer to bulk PtSe2 exfoliated crystals 2D Mater. (IF 5.5) Pub Date : 2024-01-24 Marin Tharrault, Eva Desgué, Dominique Carisetti, Bernard Plaçais, Christophe Voisin, Pierre Legagneux, Emmanuel Baudin
Raman spectroscopy is widely used to assess the quality of 2D materials thin films. This report focuses on PtSe2 , a noble transition metal dichalcogenide which has the remarkable property to transit from a semi-conductor to a semi-metal with increasing layer number. While polycrystalline PtSe2 can be grown with various crystalline qualities, getting insight into the monocrystalline intrinsic properties
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Recent progress on degradation mechanism and antioxidation of low-dimensional black phosphorus 2D Mater. (IF 5.5) Pub Date : 2024-01-23 Mingfu Fu, Jiabao Li, Wen Yang, Yong Zhang, Peizhi Yang
Among the allotropes of phosphorus, black phosphorus (BP) is one of the most thermodynamically stable structures. Due to its unique physical and chemical properties, BP has shown considerable potential in many applications, such as field-effect transistors, energy storage and conversion, and photocatalysis. However, low-dimensional BP is easily corroded by oxygen and water owing to the large specific
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Tuning the atomic and electronic structures of mirror twin boundaries in molecular beam epitaxy grown MoSe2 monolayers via rhenium doping 2D Mater. (IF 5.5) Pub Date : 2024-01-22 Zhoubin Yu, Yipu Xia, Hannu-Pekka Komsa, Junqiu Zhang, Maohai Xie, Chuanhong Jin
Interplay between defects like mirror twin boundaries (MTBs) and dopants may provide additional opportunities for furthering the research on two-dimensional monolayer (ML) transition metal dichalcogenides. In this work, we successfully dope rhenium (Re) into molecular beam epitaxy grown ML MoSe2 and confirm the formation of a new type of MTBs, named 4|4E-M (M represents metal, Mo/Re) according to the
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Five near-infrared-emissive graphene quantum dots for multiplex bioimaging 2D Mater. (IF 5.5) Pub Date : 2024-01-19 Alina R Valimukhametova, Olivia Fannon, Ugur C Topkiran, Abby Dorsky, Olivia Sottile, Roberto Gonzalez-Rodriguez, Jeffery Coffer, Anton V Naumov
Due to high tissue penetration depth and low autofluorescence backgrounds, near-infrared (NIR) fluorescence imaging has recently become an advantageous diagnostic technique used in a variety of fields. However, most of the NIR fluorophores do not have therapeutic delivery capabilities, exhibit low photostabilities, and raise toxicity concerns. To address these issues, we developed and tested five types
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Control of the valley polarization of monolayer WSe2 by Dexter-like coupling 2D Mater. (IF 5.5) Pub Date : 2024-01-17 Jakub Jasiński, Joshua J P Thompson, Swaroop Palai, Maciej Śmiertka, Mateusz Dyksik, Takashi Taniguchi, Kenji Watanabe, Michał Baranowski, Duncan K Maude, Alessandro Surrente, Ermin Malic, Paulina Płochocka
Intervalley scattering mechanisms strongly affect the dynamics of excitonic complexes in transition metal dichalcogenide monolayers. Here, we investigate the excitation energy dependence of the valley polarization of excitons in a WSe2 monolayer. We observe that the valley polarization drastically decreases when the excitation is resonant with the B 1s resonance. This behavior can be explained by a
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Spatially-indirect and hybrid exciton–exciton interaction in MoS2 homobilayers 2D Mater. (IF 5.5) Pub Date : 2024-01-17 Valeria A Maslova, Nina S Voronova
Interlayer excitons in transition-metal dichalcogenide (TMD) bilayers, alongside their interplay with direct excitonic species, are supposed to offer a pathway towards robust nonlinearity, enabling the exploration of many-body quantum effects. We present a theoretical investigation of interaction among various exciton species within these structures where Coulomb attraction and repulsion are subject
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Control of stripe, skyrmion and skyrmionium formation in the 2D magnet Fe3−xGeTe2 by varying composition 2D Mater. (IF 5.5) Pub Date : 2024-01-17 Max T Birch, Lukas Powalla, Kai Litzius, Vanessa Nehruji, Ondrej Hovorka, Sebastian Wintz, Frank Schulz, Daniel A Mayoh, Geetha Balakrishnan, Markus Weigand, Marko Burghard, Gisela Schütz
Two-dimensional (2D) van der Waals (vdW) magnets have recently emerged as novel skyrmion hosts. This discovery has opened a new material platform for tuning the properties of topological spin textures, such as by exploiting proximity effects induced by stacking of 2D materials into heterostructures, or by directly manipulating the structural composition of the host material. Previous works have considered
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Area-selective chalcogenization of transition metals through graphene mask 2D Mater. (IF 5.5) Pub Date : 2024-01-12 Jaekwang Song, Jong-Hwan Lee, Seoungwoong Park, Yunseok Lee, Chan-Jin Kim, Minchul Ahn, Byung Hee Hong
Area-selection reactions have been extensively investigated to control or change physicochemical properties of substances with micro- or nanoscale precision. Several polymeric materials called photoresists have been used to mask and pattern the specific region, which can block chemical reactions or deposition. However, they are not suitable for certain chemical reaction since they are vulnerable to
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Pressure-driven superconductivity in layered isostructural germanium phosphides 2D Mater. (IF 5.5) Pub Date : 2024-01-11 Junwei Huang, Caorong Zhang, Kun Zhai, Feng Qin, Lingyi Ao, Zeya Li, Ling Zhou, Ming Tang, Xueting Dai, Caiyu Qiu, Yi Zhang, Fusheng Wen, Zhongyuan Liu, Hongtao Yuan
The discovery of superconductivity and its modulation are long-standing cutting-edge research topics in condensed matter physics. As a powerful tool, the high-pressure technique can be used to achieve novel superconductors and tune their physical properties. One typical example is binary germanium phosphides with different stoichiometries, which exhibit abundant physical properties with layered lattice
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Modification of interlayer interaction in bilayer MoS2 due to monolayer WSe2 in heterostructures 2D Mater. (IF 5.5) Pub Date : 2024-01-11 Siwon Oh, Han-gyu Kim, Jungcheol Kim, Huiseok Jeong, Hyoung Joon Choi, Hyeonsik Cheong
The low-frequency interlayer vibration modes in bilayer-MoS2/monolayer-WSe2 heterostructures were investigated to study the modification of interlayer interactions due to the moiré periodicity. The interplay of the interlayer interaction within bilayer MoS2 and the interfacial interaction between the two materials results in rich features in the phonon spectra. Several shear and breathing modes are
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Photogating enhanced photodetectors dominated by rubrene nanodots modified SnS2 films 2D Mater. (IF 5.5) Pub Date : 2024-01-11 Guoxiang Si, Fangjun Liu, Lizhao Su, Zhaoxuan Wu, Qi Zhang, Shuoqi Sun, Hongbin Zhang
The hybrid-induced photogating effect is considered as an effective way for photoconductance modulating in low-dimensional photodetectors. Besides, through constructing the local photogate vertical heterostructures on two-dimensional SnS2 surface can significantly increase its photoconductive gain. However, the potential of this photogain mechanism for SnS2 films has not yet been revealed in practical
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MXene Fe2C as a promising candidate for the 2D XY ferromagnet 2D Mater. (IF 5.5) Pub Date : 2024-01-04 E M Agapov, I A Kruglov, A A Katanin
Monolayer Fe2C is expected to possess strong electronic correlations, which can significantly contribute to electronic and magnetic properties. In this study we consider electronic and magnetic properties of MXene Fe2C within the DFT+DMFT approach. We establish the existence of local magnetic moments μloc=3.3μB in this compound, characterized by sufficiently long lifetime of τ∼350 fs. We also calculate
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Exfoliation of graphite to turbostratic graphene 2D Mater. (IF 5.5) Pub Date : 2023-12-28 K Vijay Kumar, Aminul Islam, P Sai Kiran, Niranjan Pandit, Rahul Kumar, Satish Indupuri, Anup Kumar Keshri
Here, we exfoliated high-quality turbostratic graphene with a clean interface at a high production rate (10 g h−1) directly from graphite using an industrial-friendly technique i.e. plasma spraying, catching note of its growing global interest. The reduction of the (002) x-ray diffraction peak and the transparent scanning electron microscope image are used to characterize the exfoliation. The thickness
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Solution-processed graphene films for electrochemical monitoring of extracellular nitric oxide released by breast cancer cells 2D Mater. (IF 5.5) Pub Date : 2023-12-20 Derrick Butler, Chinmay S Sankhe, Pouya Soltan Khamsi, Esther W Gomez, Aida Ebrahimi
Nitric oxide (NO) plays an important role in cardiovascular function, immune response, and intercellular signaling. However, due to its short lifetime, real-time detection of NO is challenging. Herein, an electrochemical sensor based on fibronectin-modified, solution-processed graphene ink for NO detection is developed using a facile fabrication method involving spin-coating and hot-plate annealing
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Delving into the anisotropic interlayer exchange in bilayer CrI3 2D Mater. (IF 5.5) Pub Date : 2023-12-15 Srdjan Stavrić, Paolo Barone, Silvia Picozzi
Bilayer CrI3 attracted much attention due to stacking-induced switching between the layered ferromagnetic and antiferromagnetic order. This discovery brought under the spotlight the interlayer Cr–Cr exchange interaction, which despite being much weaker than the intralayer exchange, plays an important role in shaping the magnetic properties of bilayer CrI3. In this work we delve into the anisotropic
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Paramagnetic two-dimensional silicon-oxide from natural silicates 2D Mater. (IF 5.5) Pub Date : 2023-12-12 Preeti Lata Mahapatra, Caique Campos de Oliveira, Gelu Costin, Suman Sarkar, Pedro A S Autreto, Chandra Sekhar Tiwary
Silicon dioxide’s potential for having magnetic properties is fascinating, as combining its electronic capabilities with magnetic response seems promising for spintronics. In this work, the mechanisms that drive the change from diamagnetic behavior in pure silicates like SiO2 to paramagnetic behavior in transition metal-doped silicates like Rhodonite silicate (CaMn3Mn(Si5O15)) are explored. This naturally
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Controllable superconducting to semiconducting phase transition in topological superconductor 2M-WS2 2D Mater. (IF 5.5) Pub Date : 2023-12-11 Sabin Gautam, Joseph McBride, William R Scougale, Piumi I Samarawickrama, Danilo De Camargo Branco, Peilin Yang, ZhuangEn Fu, Wenyong Wang, Jinke Tang, Gary J Cheng, John Ackerman, TeYu Chien, Brian M Leonard, Jifa Tian
The investigation of exotic properties in two-dimensional (2D) topological superconductors has garnered increasing attention in condensed matter physics, particularly for applications in topological qubits. Despite this interest, a reliable way of fabricating topological Josephson junctions (JJs) utilizing topological superconductors has yet to be demonstrated. Controllable structural phase transition
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The role of solvent interfacial structural ordering in maintaining stable graphene dispersions 2D Mater. (IF 5.5) Pub Date : 2023-12-08 Urvesh Patil, Nuala M Caffrey
Liquid phase exfoliation is the most promising method for the low-cost, scalable production of two-dimensional nanosheets from their bulk counterparts. Extensive exfoliation occurs in most solvents due to the huge amount of energy introduced by sonication or shear mixing. However, the subsequent dispersion is not always stable, with extensive reaggregation occurring in some solvents. Identifying the
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Two-dimensional MSi2N4 (M = Ge, Sn, and Pb) monolayers: promising new materials for optoelectronic applications 2D Mater. (IF 5.5) Pub Date : 2023-12-05 Mirali Jahangirzadeh Varjovi, Soheil Ershadrad, Biplab Sanyal, Sergio Tosoni
The recent growth of two-dimensional (2D) layered crystals of MoSi2N4 and WSi2N4 has sparked significant interest due to their outstanding properties and potential applications. This development has paved the way for a new and large family of 2D materials with a general formula of MA 2 Z 4. In this regard, motivated by this exciting family, we propose two structural phases (1T- and 1H-) of MSi2N4 (M
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Higher-order obstructed atomic insulator phase in pentagonal monolayer PdSe2 2D Mater. (IF 5.5) Pub Date : 2023-12-05 Victor Nuñez, Sergio Bravo, J D Correa, Leonor Chico, M Pacheco
We investigate a pentagonal monolayer of palladium diselenide, a stable two-dimensional system, as a material realization of a crystalline phase with nontrivial topological electronic properties. We find that its electronic structure involves an atomic obstructed insulator related to higher-order topology, which is a consequence of the selenium-selenium bond dimerization along with inversion and time-reversal
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Oxygen vacancy in CoO/reduced graphene oxide composite for enhancing long-term effectiveness of photocatalytic CO2 reduction via mediating exciton 2D Mater. (IF 5.5) Pub Date : 2023-12-04 Rui Wang, Libo Du, Yang Liu, Yueliang Gu, Xiaolong Li, Yuehui Li
Photocatalytic reduction of carbon dioxide (CO2) has been expected to be an effective way to reduce carbon emissions. Designing photocatalytic materials with long-term effectiveness is the key of photocatalytic technology. In this work, CoO nanoparticles loaded on the surface of reduced graphene oxide (rGO) membranes on silicon substrate were in-situ fabricated by one-step method. The resulting materials
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Above-room-temperature ferromagnetism in a layered CrIr2Sn10 crystal 2D Mater. (IF 5.5) Pub Date : 2023-11-30 Xuzhou Sun, Ke Yang, Yuqiang Fang, Hua Wu, Fuqiang Huang
Layered ferromagnetic (FM) materials are significant for nano-spintronic devices, however, low transition temperature and air instability remain major challenges for layered FM compounds. Herein, we have synthesized layered crystals CrIr2Sn10 with FM transition below 315 K. The ratio of the magnetization between in-plane and out-of-plane is 41. Moreover, the magnetism of CrIr2Sn10 is derived from the
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Transient vortex dynamics and evolution of Bose metal from a 2D superconductor on MoS2 2D Mater. (IF 5.5) Pub Date : 2023-11-22 Sreevidya Narayanan, Anoop Kamalasanan, Annu Anns Sunny, Madhu Thalakulam
The true character of physical phenomena is thought to be reinforced as the system becomes disorder-free. In contrast, the two-dimensional (2D) superconductor is predicted to turn fragile and resistive away from the limit I → 0, B → 0, in the pinning-free regime. It is intriguing to note that the very vortices responsible for achieving superconductivity by pairing, condensation, and, thereby reducing
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Polarization-tuneable excitonic spectral features in the optoelectronic response of atomically thin ReS2 2D Mater. (IF 5.5) Pub Date : 2023-11-13 Daniel Vaquero, Olga Arroyo-Gascón, Juan Salvador-Sánchez, Pedro L Alcázar-Ruano, Enrique Diez, Ana Perez-Rodríguez, Julián D Correa, Francisco Dominguez-Adame, Leonor Chico, Jorge Quereda
The low crystal symmetry of rhenium disulphide (ReS2) leads to the emergence of dichroic optical and optoelectronic response, absent in other layered transition metal dichalcogenides, which could be exploited for device applications requiring polarization resolution. To date, spectroscopy studies on the optical response of ReS2 have relied almost exclusively in characterization techniques involving
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Growth of aligned and twisted hexagonal boron nitride on Ir(110) 2D Mater. (IF 5.5) Pub Date : 2023-11-10 Thomas Michely, Jason Bergelt, Affan Safeer, Alexander Bäder, Tobias Hartl, Jeison Fischer
The growth of monolayer hexagonal boron nitride (h-BN) on Ir(110) through low-pressure chemical vapor deposition is investigated using low energy electron diffraction and scanning tunneling microscopy. We find that the growth of aligned h-BN on Ir(110) requires a growth temperature of 1500 K, whereas lower growth temperatures result in coexistence of aligned h-BN with twisted h-BN. The presence of
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Enhanced vacuum ultraviolet photoemission from graphene nanoribbons 2D Mater. (IF 5.5) Pub Date : 2023-11-03 Martina Corso, Jorge Lobo-Checa, Andrew P Weber, Ignacio Piquero-Zulaica, Zakaria M Abd El-Fattah, Patrick Le Fèvre, J Enrique Ortega, Eugene Krasovskii
Photon-energy dependence of photoemission from seven-atoms-wide armchair graphene nanoribbons (GNRs) is studied experimentally and theoretically up to ℏω=95 eV. A strong photon energy dependence of the normal emission from the valence band maximum (VB1) is observed, sharply peaked at ℏω=12 eV. The detailed analysis of the light-polarization dependence of the photoemission from VB1 unambiguously characterizes
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Power efficient MoS2 synaptic devices based on Maxwell–Wagner interfacial charging in binary oxides 2D Mater. (IF 5.5) Pub Date : 2023-11-03 Jingyi Zou, Sen Lin, Tianyi Huang, Hefei Liu, Yushuang Liu, Yibai Zhong, Yuxuan Cosmi Lin, Han Wang, Sheng Shen, Min Xu, Xu Zhang
Synaptic devices with tunable weight hold great promise in enabling non-von Neumann architecture for energy efficient computing. However, conventional metal-insulator-metal based two-terminal memristors share the same physical channel for both programming and reading, therefore the programming power consumption is dependent on the synaptic resistance states and can be particularly high when the memristor
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Cross-dimensional valley excitons from Förster coupling in arbitrarily twisted stacks of monolayer semiconductors 2D Mater. (IF 5.5) Pub Date : 2023-10-27 Ci Li, Wang Yao
In stacks of transition metal dichalcogenide monolayers with arbitrary twisting angles, we explore a new class of bright excitons arising from the pronounced Förster coupling, whose dimensionality is tuned by its in-plane momentum. The low energy sector at small momenta is two-dimensional, featuring a Mexican Hat dispersion, while the high energy sector at larger momenta becomes three-dimensional (3D)
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Controllable growth of wafer-scale two-dimensional WS2 with outstanding optoelectronic properties 2D Mater. (IF 5.5) Pub Date : 2023-10-27 Shiwei Zhang, Yulong Hao, Fenglin Gao, Xiongqing Wu, Shijie Hao, Mengchun Qiu, Xiaoming Zheng, Yuehua Wei, Guolin Hao
As one of two-dimensional (2D) semiconductor materials, transition metal dichalcogenides (TMDs) have sparked enormous potential in next-generation electronics due to their unique and excellent physical, electronic and optical properties. Controllable growth of wafer-scale 2D TMDs is essential to realize the various high-end applications of TMDs, while it remains challenging. Herein, 2 inch 2D WS2 films
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Metal–metal bonding, electronic excitations, and strong resonance Raman effect in 2D layered α-MoCl3 2D Mater. (IF 5.5) Pub Date : 2023-10-26 Sandra Schiemenz, Samuel Froeschke, Marco Naumann, Marco Rosenkranz, Bernd Büchner, Andreas Koitzsch, Martin Knupfer, Silke Hampel, Stanislav M Avdoshenko, Alexey A Popov
Covalent bonding between transition metal atoms is a common phenomenon in honeycomb lattices of layered materials, which strongly affects their electronic and magnetic properties. This work presents a detailed spectroscopic study of α-MoCl3, 2D van der Waals material with covalently bonded Mo2 dimers, with a particular focus on the Mo–Mo bonding. Raman spectra of α-MoCl3 were studied with multiple
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Phonon-mediated magneto-resonances in biased graphene layers 2D Mater. (IF 5.5) Pub Date : 2023-10-26 Mrityunjay Pandey, Kenji Watanabe, Takashi Taniguchi, Srinivasan Raghavan, U Chandni
We explore the non-equilibrium transport regime in graphene using a large dc current in combination with a perpendicular magnetic field. The strong in-plane Hall field generated in the graphene channel results in Landau levels that are tilted spatially. The energy of cyclotron orbits in the bulk varies as a function of the spatial position of the guiding center, enabling us to observe a series of compelling
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MXenes hierarchical architectures: electromagnetic absorbing, shielding and devices 2D Mater. (IF 5.5) Pub Date : 2023-10-25 Qiang-qiang Wang, Wen-qiang Cao, Mao-sheng Cao
Layered transition metal carbides or nitrides (MXenes), as a novel two-dimensional material, are widely used in the field of electromagnetic (EM) functions and devices due to their unique EM properties. However, the excessive conductivity of MXenes nanosheets often causes impedance mismatch, resulting in a single EM function. Moreover, original MXenes nanosheets are too small in size and needed to
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What governs the atomic structure of the interface between 2D transition metal dichalcogenides in lateral heterostructures? 2D Mater. (IF 5.5) Pub Date : 2023-10-19 Francis H Davies, Kai Mehlich, Carsten Busse, Arkady V Krasheninnikov
The development of lateral heterostructures (LHs) based on two-dimensional (2D) materials with similar atomic structure but distinct electronic properties, such as transition metal dichalcogenides (TMDCs), opened a new route towards realisation of optoelectronic devices with unique characteristics. In contrast to van der Waals vertical heterostructures, the covalent bonding at the interface between
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Graphdiyne (CnH2n−2)/NiWO4 self-assembled p–n junction characterized with in situ XPS for efficient photocatalytic hydrogen production 2D Mater. (IF 5.5) Pub Date : 2023-10-18 Linqing Zhang, Minjun Lei, Zhiliang Jin
As is well known, how to deeply understand the charge separation and charge transfer capabilities of catalysts, as well as how to optimize these capabilities of catalysts to improve hydrogen production performance, remains a huge challenge. In recent years, a new type of carbon material graphdiyne (GDY) has been proposed. GDY acetylene has a special atomic arrangement that graphene does not have a
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Enhancing pseudocapacitive intercalation in Ti3C2T x MXene with molecular crowding electrolytes 2D Mater. (IF 5.5) Pub Date : 2023-10-12 Chaofan Chen, Albert de Kogel, Mark Weijers, Lars J Bannenberg, Xuehang Wang
The growing demand for safe, cost-efficient, high-energy and high-power electrochemical energy storage devices has stimulated the development of aqueous-based supercapacitors with high capacitance, high rate capability, and high voltage. 2D titanium carbide MXene-based electrodes have shown excellent rate capability in various dilute aqueous electrolytes, yet their potential window is usually narrower
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Strain-induced topological transitions and tilted Dirac cones in kagome lattices 2D Mater. (IF 5.5) Pub Date : 2023-10-06 M A Mojarro, Sergio E Ulloa
We study effects of strain on the electronic properties of the kagome lattice in a tight-binding formalism with spin–orbit coupling (SOC). The degeneracy at the Γ point evolves into a pair of emergent tilted Dirac cones under uniaxial strain, where the anisotropy and tilting of the bands depend on the magnitude and direction of the strain field. SOC opens gaps at the emergent Dirac points, making the
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Temperature dependent temporal coherence of metallic-nanoparticle-induced single-photon emitters in a WSe2 monolayer 2D Mater. (IF 5.5) Pub Date : 2023-09-29 Martin von Helversen, Lara Greten, Imad Limame, Ching-Wen Shih, Paul Schlaugat, Carlos Antón-Solanas, Christian Schneider, Bárbara Rosa, Andreas Knorr, Stephan Reitzenstein
In recent years, much research has been undertaken to investigate the suitability of two-dimensional materials to act as single-photon sources with high optical and quantum optical quality. Amongst them, transition-metal dichalcogenides, especially WSe2, have been one of the subjects of intensive studies. Yet, their single-photon purity and photon indistinguishability remain the most significant challenges
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Magnetic field assisted stabilization of circular double wall domain lattice in oxidized Fe3GeTe2 flakes 2D Mater. (IF 5.5) Pub Date : 2023-09-29 P Pappas, E Georgopoulou-Kotsaki, A Lintzeris, A Dimoulas
The family of 2D ferromagnets is in the center of research for novel spintronics applications. Among the various 2D ferromagnets, Fe3GeTe2 has drawn significant attention since it combines a high Curie temperature with a van der Waals structure, which allows easy exfoliation, and a high spin polarization/large spin–orbit coupling. The presence of interfacial DMI in 2D ferromagnets have a significant
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Band type engineering using different stacking configurations of anisotropic and isotropic monolayer transition metal dichalcogenides 2D Mater. (IF 5.5) Pub Date : 2023-09-26 Gowtham Polumati, Barbara A Muñiz Martínez, Chandra Sekhar Reddy Kolli, Venkatarao Selamneni, Mario Flores Salazar, David Emanuel Sanchez, Andres Fest Carreno, Mauricio Terrones, Andres De Luna Bugallo, Parikshit Sahatiya
This work demonstrates the band-type engineering and the detailed charge transport mechanism upon visible light illumination for various configurations of vertically stacked monolayers of MoS2-ReS2 grown by a two-step chemical vapour deposition method. In order to understand the stacking order of both materials has a direct impact on the band alignment arrangements, we investigate the optical properties
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Screening induced crossover between phonon- and plasmon-mediated pairing in layered superconductors 2D Mater. (IF 5.5) Pub Date : 2023-09-25 Y in’t Veld, M I Katsnelson, A J Millis, M Rösner
Two-dimensional (2D) metals can host gapless plasmonic excitations that strongly couple to electrons and thus may significantly affect superconductivity. To investigate the dynamical interplay of the electron–electron and electron–phonon interactions in the theory of 2D superconductivity, we apply a full momentum- and frequency-dependent one-loop theory treating electron–phonon, electron–plasmon, and
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Raman study of layered breathing kagome lattice semiconductor Nb3Cl8 2D Mater. (IF 5.5) Pub Date : 2023-09-25 Dylan A Jeff, Favian Gonzalez, Kamal Harrison, Yuzhou Zhao, Tharindu Fernando, Sabin Regmi, Zhaoyu Liu, Humberto R Gutierrez, Madhab Neupane, Jihui Yang, Jiun-Haw Chu, Xiaodong Xu, Ting Cao, Saiful I Khondaker
Niobium chloride (Nb3Cl8) is a layered two-dimensional semiconducting material with many exotic properties including a breathing kagome lattice, a topological flat band in its band structure, and a crystal structure that undergoes a structural and magnetic phase transition at temperatures below 90 K. Despite being a remarkable material with fascinating new physics, the understanding of its phonon properties
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Dielectric breakdown and sub-wavelength patterning of monolayer hexagonal boron nitride using femtosecond pulses 2D Mater. (IF 5.5) Pub Date : 2023-09-25 Sabeeh Irfan Ahmad, Arpit Dave, Emmanuel Sarpong, Hsin-Yu Yao, Joel M Solomon, Jing-Kai Jiang, Chih-Wei Luo, Wen-Hao Chang, Tsing-Hua Her
Hexagonal boron nitride (hBN) has emerged as a promising two-dimensional (2D) material for many applications in electronics and photonics. Although its linear and nonlinear optical properties have been extensively studied, the interaction of hBN with high-intensity laser pulses, which is important for realizing high-harmonic generation, creating deterministic defects as quantum emitters, and resist-free
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Revealing flat bands and hybridization gaps in a twisted bilayer graphene device with microARPES 2D Mater. (IF 5.5) Pub Date : 2023-09-18 Zhihao Jiang, Kimberly Hsieh, Alfred J H Jones, Paulina Majchrzak, Chakradhar Sahoo, Kenji Watanabe, Takashi Taniguchi, Jill A Miwa, Yong P Chen, Søren Ulstrup
Controlling the electronic structure of two-dimensional materials using the combination of twist angle and electrostatic doping is an effective means to induce emergent phenomena. In bilayer graphene with an interlayer twist angle near the magic angle, the electronic dispersion is strongly modified by a manifold of hybridizing moiré Dirac cones leading to flat band segments with strong electronic correlations
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Imaging lattice reconstruction in homobilayers and heterobilayers of transition metal dichalcogenides 2D Mater. (IF 5.5) Pub Date : 2023-09-18 Anna Rupp, Jonas Göser, Zhijie Li, Ismail Bilgin, Anvar Baimuratov, Alexander Högele
Moiré interference effects influence profoundly the optoelectronic properties of vertical van der Waals structures. Here we systematically establish secondary electron imaging in a scanning electron microscope as a powerful technique for visualizing reconstruction of moiré lattices into registry-contrasting domains in vertical homobilayers and heteorbilayers of transition metal dichalcogenides (TMDs)