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  • Strong exciton-photon coupling in large area MoSe 2 and WSe 2 heterostructures fabricated from two-dimensional materials grown by chemical vapor deposition
    2D Mater. (IF 7.14) Pub Date : 2020-11-21
    Daniel J Gillard, Armando Genco, Seongjoon Ahn, Thomas P Lyons, Kyung Yeol Ma, A-Rang Jang, Toby Severs Millard, Aurélien A P Trichet, Rahul Jayaprakash, Kyriacos Georgiou, David G Lidzey, Jason M Smith, Hyeon Suk Shin and Alexander I Tartakovskii

    Two-dimensional semiconducting transition metal dichalcogenides embedded in optical microcavities in the strong exciton-photon coupling regime may lead to promising applications in spin and valley addressable polaritonic logic gates and circuits. One significant obstacle for their realization is the inherent lack of scalability associated with the mechanical exfoliation commonly used for fabrication

  • Phonon properties and photo-thermal oxidation of micromechanically exfoliated antimonene nanosheets
    2D Mater. (IF 7.14) Pub Date : 2020-11-21
    Michael Fickert, Mhamed Assebban, Josep Canet-Ferrer and Gonzalo Abellán

    Two-dimensional (2D) sheets of antimonene have attracted increasing attention due to their unique physical and chemical properties prompting potential for diverse applications. We present a facile method to prepare high-quality antimonene nanosheets (ANSs) by micromechanical exfoliation on SiO 2 /Si substrate. The temperature- and laser power-dependent Raman studies of exfoliated ANSs are reported

  • Two stage epitaxial growth of wafer-size multilayer h-BN by metal-organic vapor phase epitaxy – a homoepitaxial approach
    2D Mater. (IF 7.14) Pub Date : 2020-11-14
    Aleksandra Krystyna Dąbrowska, Mateusz Tokarczyk, Grzegorz Kowalski, Johannes Binder, Rafał Bożek, Jolanta Borysiuk, Roman Stępniewski and Andrzej Wysmołek

    Van der Waals heterostructures based on hexagonal boron nitride (h-BN) and other 2D materials may pave the way for future electronic applications. Wafer-scale uniform h-BN substrates are a must in this respect. In this work, we demonstrate a new growth regime which allows for scalable, uniform synthesis of high quality h-BN layers on 2’ sapphire substrates. We propose a new approach to metal organic

  • Probing the structure and composition of van der Waals heterostructures using the nonlocality of Dirac plasmons in the terahertz regime
    2D Mater. (IF 7.14) Pub Date : 2020-10-30
    I R Lavor, L S R Cavalcante, Andrey Chaves, F M Peeters and B Van Duppen

    Dirac plasmons in graphene are very sensitive to the dielectric properties of the environment. We show that this can be used to probe the structure and composition of van der Waals heterostructures (vdWh) put underneath a single graphene layer. In order to do so, we assess vdWh composed of hexagonal boron nitride and different types of transition metal dichalcogenides (TMDs). By performing realistic

  • Synthesis of layered silicon-graphene hetero-structures by wet jet milling for high capacity anodes in Li-ion batteries
    2D Mater. (IF 7.14) Pub Date : 2020-10-30
    Romeo Malik, Qianye Huang, Laura Silvestri, Danqing Liu, Vittorio Pellegrini, Luigi Marasco, Eleonora Venezia, Sara Abouali, Francesco Bonaccorso, Michael J Lain, David Greenwood, Geoff West, Paul R Shearing and Melanie J Loveridge

    While silicon-based negative electrode materials have been extensively studied, to develop high capacity lithium-ion batteries (LIBs), implementing a large-scale production method that can be easily transferred to industry, has been a crucial challenge. Here, a scalable wet-jet milling method was developed to prepare a silicon-graphene hybrid material to be used as negative electrode in LIBs. This

  • Ghost anti-crossings caused by interlayer umklapp hybridization of bands in 2D heterostructures
    2D Mater. (IF 7.14) Pub Date : 2020-10-30
    Abigail J Graham, Johanna Zultak, Matthew J Hamer, Viktor Zolyomi, Samuel Magorrian, Alexei Barinov, Viktor Kandyba, Alessio Giampietri, Andrea Locatelli, Francesca Genuzio, Natalie C Teutsch, Cuauhtémoc Salazar, Nicholas D M Hine, Vladimir I Fal’ko, Roman V Gorbachev and Neil R Wilson

    In two-dimensional heterostructures, crystalline atomic layers with differing lattice parameters can stack directly one on another. The resultant close proximity of atomic lattices with differing periodicity can lead to new phenomena. For umklapp processes, this opens the possibility for interlayer umklapp scattering, where interactions are mediated by the transfer of momenta to or from the lattice

  • Recent progress and strategies in photodetectors based on 2D inorganic/organic heterostructures
    2D Mater. (IF 7.14) Pub Date : 2020-10-30
    Hongwei Li, Zhuo Dong, Yan Zhang, Liqiang Li, Zhongchang Wang, Cong Wang, Kai Zhang and Han Zhang

    Two-dimensional (2D) inorganic/organic heterostructures have attracted great attention in the field of optoelectronics due to their unique properties. Comparing with purity organic semiconductors or 2D inorganic heterostructures, the 2D inorganic/organic heterostructure overwhelms the current limitations of photodetectors and provides more opportunities for the optoelectronic field. However, no in-depth

  • Limits of funneling efficiency in non-uniformly strained 2D semiconductors
    2D Mater. (IF 7.14) Pub Date : 2020-10-30
    Moshe G Harats and Kirill I Bolotin

    Photoexcited electron-hole pairs (excitons) in transition metal dichalcogenides (TMDC) experience an effective force when these materials are non-uniformly strained. In the case of strain produced by a sharp tip pressing at the center of a suspended TMDC membrane, the excitons are transported to the point of the highest strain at the center of the membrane. This effect, exciton funneling, can be used

  • Real-time spatially resolved determination of twist angle in transition metal dichalcogenide heterobilayers
    2D Mater. (IF 7.14) Pub Date : 2020-10-30
    Sotiris Psilodimitrakopoulos, Leonidas Mouchliadis, George Miltos Maragkakis, George Kourmoulakis, Andreas Lemonis, George Kioseoglou and Emmanuel Stratakis

    Two-dimensional (2D) transition metal dichalcogenides (TMDs) offer unique optoelectronic capabilities due to their direct bandgap semiconductor nature in monolayer form. Atomically thin TMDs can be assembled in vertical stacks that are held together by van der Waals forces, enabling interlayer coupling between the layers. This creates new physical properties that depend on the relative orientation

  • Brightening of spin- and momentum-dark excitons in transition metal dichalcogenides
    2D Mater. (IF 7.14) Pub Date : 2020-10-30
    Maja Feierabend, Samuel Brem, August Ekman and Ermin Malic

    Monolayer transition metal dichalcogenides (TMDs) have been in focus of current research, among others due to their remarkable exciton landscape consisting of bright and dark excitonic states. Although dark excitons are not directly visible in optical spectra, they have a large impact on exciton dynamics and hence their understanding is crucial for potential TMD-based applications. Here, we study brightening

  • Optical dispersion of valley-hybridised coherent excitons with momentum-dependent valley polarisation in monolayer semiconductor
    2D Mater. (IF 7.14) Pub Date : 2020-10-23
    Lorenz Maximilian Schneider, Shanece S Esdaille, Daniel A Rhodes, Katayun Barmak, James C Hone and Arash Rahimi-Iman

    2D excitons in transition-metal dichalcogenides (TMDCs) offer interesting effects related to the valley pseudo-spin degree of freedom and long-range exchange interactions, as well as the coupling with light states. Several theoretical predictions have claimed that the neutral exciton of TMDCs splits into a transversal and longitudinal exciton branch, with the longitudinal one, which is the upper branch

  • Correlations in the elastic Landau level of spontaneously buckled graphene
    2D Mater. (IF 7.14) Pub Date : 2020-10-23
    A L R Manesco, J L Lado, E V S Ribeiro, G Weber and D Rodrigues Jr

    Electronic correlations stemming from nearly flat bands in van der Waals materials have demonstrated to be a powerful playground to engineer artificial quantum matter, including superconductors, correlated insulators and topological matter. This phenomenology has been experimentally observed in a variety of twisted van der Waals materials, such as graphene and dichalcogenide multilayers. Here we show

  • Reduced thermal conductivity of supported and encased monolayer and bilayer MoS 2
    2D Mater. (IF 7.14) Pub Date : 2020-10-19
    Alexander J Gabourie, Saurabh V Suryavanshi, Amir Barati Farimani and Eric Pop

    Electrical and thermal properties of atomically thin two-dimensional (2D) materials are affected by their environment, e.g. through remote phonon scattering or dielectric screening. However, while it is known that mobility and thermal conductivity (TC) of graphene are reduced on a substrate, these effects are much less explored in 2D semiconductors such as MoS 2 . Here, we use molecular dynamics to

  • Strong-coupling charge density wave in monolayer TiSe 2
    2D Mater. (IF 7.14) Pub Date : 2020-10-16
    Matthew D Watson, Akhil Rajan, Tommaso Antonelli, Kaycee Underwood, Igor Marković, Federico Mazzola, Oliver J Clark, Gesa-Roxanne Siemann, Deepnarayan Biswas, Andrew Hunter, Sven Jandura, Janika Reichstetter, Martin McLaren, Patrick Le Fèvre, Giovanni Vinai and Philip D C King

    We study the 2 × 2 charge density wave (CDW) in epitaxially-grown monolayer TiSe 2 . Our temperature-dependent angle-resolved photoemission spectroscopy measurements indicate a strong-coupling instability, but reveal how not all states couple equally to the symmetry-breaking distortion, with an electron pocket persisting to low temperature as a non-bonding state. We further show how the CDW order can

  • Discovery of Ag x TaS 2 superconductor with stage-3 structure
    2D Mater. (IF 7.14) Pub Date : 2020-10-14
    Khurelbaatar Zagarzusem, Masaya Fujioka, Taizo Shibuya, Satoshi Demura, Shintaro Adachi, Yoshihiko Takano, Melbert Jeem, Madoka Ono, Hideo Kaiju and Junji Nishii

    Through interfacial engineering, such as ion intercalation, we can tune the properties and optimize the performance of transition metal dichalcogenides and their devices. In this study, we present the first-time experimental investigations of stage 3 of Ag x TaS 2 single crystal, and its superconductivity was discovered at 3.8 K. Highly crystalline stage 1 and 2 were prepared by a proton-driven ion-introduction

  • Single-layer Mo 5 Te 8 ― A new polymorph of layered transition-metal chalcogenide
    2D Mater. (IF 7.14) Pub Date : 2020-10-14
    Junqiu Zhang, Yipu Xia, Bo Wang, Yuanjun Jin, Hao Tian, Wing kin Ho, Hu Xu, Chuanhong Jin and Maohai Xie

    Single-layer (SL) transition-metal chalcogenides (TMCs) represent an important family of two-dimensional (2D) materials that have attracted intensive research attention recently. It has been established that many TMCs are polymorphic that can exist in different crystal structures and correspondingly exhibit diverse physical properties. Discovery of new structural phases of a crystal is of great scientific

  • Graphene based Van der Waals contacts on MoS 2 field effect transistors
    2D Mater. (IF 7.14) Pub Date : 2020-10-14
    Vivek Mootheri, Goutham Arutchelvan, Sreetama Banerjee, Surajit Sutar, Alessandra Leonhardt, Marie-Emmanuelle Boulon, Cedric Huyghebaert, Michel Houssa, Inge Asselberghs, Iuliana Radu, Marc Heyns and Dennis Lin

    Device performance of two dimensional (2D) material based field effect transistors is severely limited by the relatively high contact resistance encountered at the contact-channel interface. Metal-graphene hybrid contacts have been previously used to improve the contact resistance of devices based on thick exfoliated materials. Here we report a novel 2D FET fabrication process entailing the transfer

  • Pre-protection strategy performed in processable aqueous dispersions of TiS 2 nanosheets to fabricate laminar films with improved electric properties
    2D Mater. (IF 7.14) Pub Date : 2020-10-14
    Wenjun Ding, Qinglin Jiang, Guoqiang Liu, Liming Xu, Peng Liu, Jing Liu, Fengxing Jiang, Peipei Liu, Congcong Liu and Jingkun Xu

    Processable aqueous dispersions of two-dimensional (2D) transition metal dichalcogenides (TMDs) nanosheets show extraordinary promise in assembling laminar films for a variety of applications but are usually limited by the oxidation of adsorbed water molecular on the edge and defect regions, which damage the stability of the colloidal solution and electric properties of the resulted films. In this

  • Mono- to few-layer non-van der Waals 2D lanthanide-doped NaYF 4 nanosheets with upconversion luminescence
    2D Mater. (IF 7.14) Pub Date : 2020-10-12
    Christian Clarke, Mandeep Singh, Sherif Abdulkader Tawfik, Xiaoxue Xu, Michelle J S Spencer, Rajesh Ramanathan, Philipp Reineck, Vipul Bansal and Cuong Ton-That

    NaYF 4 is an efficient host material for lanthanide-based upconversion luminescence and has attracted immense interest for potential applications in photovoltaics, lasers and bioimaging. However, being a non-van der Waals (non-vdW) material, there have been thus far no reports on exfoliation of bulk NaYF 4 to nanosheets and their upconversion luminescence properties. Here, we demonstrate for the first

  • How to induce superconductivity in epitaxial graphene via remote proximity effect through an intercalated gold layer
    2D Mater. (IF 7.14) Pub Date : 2020-10-09
    Estelle Mazaleyrat, Sergio Vlaic, Alexandre Artaud, Laurence Magaud, Thomas Vincent, Ana Cristina Gómez-Herrero, Simone Lisi, Priyank Singh, Nedjma Bendiab, Valérie Guisset, Philippe David, Stéphane Pons, Dimitri Roditchev, Claude Chapelier and Johann Coraux

    Graphene holds promises for exploring exotic superconductivity with Dirac-like fermions. Making graphene a superconductor at large scales is however a long-lasting challenge. A possible solution relies on epitaxially-grown graphene, using a superconducting substrate. Such substrates are scarce, and usually destroy the Dirac character of the electronic band structure. Using electron diffraction (reflection

  • Surface oxidation of Ti 3 C 2 T x enhances the catalytic activity of supported platinum nanoparticles in ammonia borane hydrolysis
    2D Mater. (IF 7.14) Pub Date : 2020-10-06
    Thierry K Slot, Fang Yue, Hualong Xu, Enrique V Ramos-Fernandez, Antonio Sepúlveda-Escribano, Zdeněk Sofer, Gadi Rothenberg and N Raveendran Shiju

    MXenes, first discovered in 2011, are two-dimensional transition metal carbides or nitrides. Because of their interesting electrical and optical properties, they are studied for applications in batteries, supercapacitors and electrocatalysis. However, MXenes are rarely used in heterogeneous catalysis and, to our knowledge, there are no reports on the use of oxidized MXenes in catalysis. Here we used

  • Interface chemistry and thermoelectric characterization of Ti and TiO x contacts to MBE-grown WSe 2
    2D Mater. (IF 7.14) Pub Date : 2020-09-29
    Keren M Freedy, Tianhui Zhu, David H Olson, Peter M Litwin, Patrick E Hopkins, Mona Zebarjadi and Stephen J McDonnell

    WSe 2 has demonstrated potential for applications in thermoelectric energy conversion. Optimization of such devices requires control over interfacial thermal and electrical transport properties. Ti, TiO x , and Ti/TiO x contacts to the MBE-grown WSe 2 are characterized by XPS and transport measurements. The deposition of Ti is found to result in W-Se bond scission yielding metallic W and Ti-Se chemical

  • Observation of above-room-temperature ferromagnetism in chemically stable layered semiconductor RhI 3
    2D Mater. (IF 7.14) Pub Date : 2020-09-29
    Xiangli Che, Zhuang Zhang, Dong Wang, Wei Zhao, Teng Wang, Pei Zhao, Gang Mu, Jian Huang and Fuqiang Huang

    Two-dimensional (2D) ferromagnetic semiconductors with a room-temperature Curie temperature ( T c ) are required for next-generation spintronic devices, but the current candidates suffer from a low T c and poor chemical stability. Here, a new layered compound RhI 3 is discovered to be an above-room-temperature ferromagnetic semiconductor. This compound crystallizes in a monoclinic crystal system of

  • Second harmonic generation in 2D layered materials
    2D Mater. (IF 7.14) Pub Date : 2020-09-29
    Jiantian Zhang, Weina Zhao, Peng Yu, Guowei Yang and Zheng Liu

    Second harmonic generation (SHG) of two-dimensional (2D) layered materials has attracted immense research interests due to the abilities of photon generation, manipulation, transmission, detection, and imaging for the applications of modern on-chip nanophotonic devices. Some layered materials with broken inversion symmetry associated with their 2D nature enable the development of nanophotonic and nanooptoelectronic

  • Theory of the thickness dependence of the charge density wave transition in 1 T-TiTe 2
    2D Mater. (IF 7.14) Pub Date : 2020-09-29
    Jianqiang Sky Zhou, Raffaello Bianco, Lorenzo Monacelli, Ion Errea, Francesco Mauri and Matteo Calandra

    Most metallic transition metal dichalcogenides undergo charge density wave (CDW) instabilities with similar or identical ordering vectors in bulk and in single layer, albeit with different critical temperatures. Metallic 1 T-TiTe 2 is a remarkable exception as it shows no evidence of charge density wave formation in bulk, but it displays a stable 2 × 2 reconstruction in single-layer form. The mechanism

  • Schottky barriers, emission regimes and contact resistances in 2H-1T’ MoS 2 lateral metal-semiconductor junctions from first-principles
    2D Mater. (IF 7.14) Pub Date : 2020-09-21
    M Laura Urquiza and Xavier Cartoixà

    We have studied the finite bias transport properties of a 2H-1T’ MoS 2 lateral metal-semiconductor (M-S) junction by non-equilibrium Green’s functions calculations, aimed at contacting the 2D channel in a field effect transistor. Our results indicate that (a) despite the fundamentally different electrostatics of line and planar dipoles, the Schottky barrier heights respond similarly to changes in doping

  • Topological magnons in CrI 3 monolayers: an itinerant fermion description
    2D Mater. (IF 7.14) Pub Date : 2020-09-21
    A T Costa, D L R Santos, N M R Peres and J Fernández-Rossier

    Magnons dominate the magnetic response of ferromagnetic two-dimensional crystals such as CrI 3 . Because of the arrangement of Cr spins in a honeycomb lattice, magnons in CrI 3 bear a strong resemblance with electrons in graphene. Neutron scattering experiments carried out in bulk CrI 3 show the existence of a gap at the Dirac points, conjectured to have a topological nature. We propose a theory for

  • Controlling the electronic bands of a 2D semiconductor by force microscopy
    2D Mater. (IF 7.14) Pub Date : 2020-09-16
    Daniel B de Araújo, Rodrigo Q Almeida, Andreij C Gadelha, Natália P Rezende, F C C S Salomão, F W N Silva, Leonardo C Campos and Eduardo B Barros

    In this work, we investigate the transverse transport properties of few-layers MoS 2 using a Conductive Atomic Force Microscopy based technique. We find that the system changes between a low-force regime, characterized by a nearly-ideal contact between the MoS 2 flake and the substrate, and a high-force regime, for which this contact starts to become highly non-ideal. We propose a 3-diode model that

  • Scratching lithography for wafer-scale MoS 2 monolayers
    2D Mater. (IF 7.14) Pub Date : 2020-09-16
    Zheng Wei, Mengzhou Liao, Yutuo Guo, Jian Tang, Yongqing Cai, Hanyang Chen, Qinqin Wang, Qi Jia, Ying Lu, Yanchong Zhao, Jieying Liu, Yanbang Chu, Hua Yu, Na Li, Jiahao Yuan, Biying Huang, Cheng Shen, Rong Yang, Dongxia Shi and Guangyu Zhang

    Monolayer MoS 2 is an emerging two-dimensional (2D) semiconductor with promise on novel electronics and optoelectronics. Standard micro-fabrication techniques such as lithography and etching are usually involved to pattern such materials for devices but usually face great challenges on yielding clean structures without edge, surface and interface contaminations induced during the fabrication process

  • Spectroscopic thickness and quality metrics for PtSe 2 layers produced by top-down and bottom-up techniques
    2D Mater. (IF 7.14) Pub Date : 2020-09-16
    Beata M Szydłowska, Oliver Hartwig, Bartlomiej Tywoniuk, Tomáš Hartman, Tanja Stimpel-Lindner, Zdeněk Sofer, Niall McEvoy, Georg S Duesberg and Claudia Backes

    Thin films of noble-metal-based transition metal dichalcogenides, such as PtSe 2 , have attracted increasing attention due to their interesting layer-number dependent properties and application potential. While it is difficult to cleave bulk crystals down to mono- and few-layers, a range of growth techniques have been established producing material of varying quality and layer number. However, to date

  • Multilayer graphene coated vanadium(V) oxide as electrodes for intercalation based brackish water desalination
    2D Mater. (IF 7.14) Pub Date : 2020-09-14
    Abhijit Baburaj, Anand B Puthirath, Amit Jain, Duraivelan Palanisamy, Devashish Salpekar, Janakiraman Balachandran, Mohamad A Kabbani, F C Robles Hernandez, Gerry Hughes, Ganguli Babu and Pulickel M Ajayan

    Present work explores graphene-coated vanadium pentoxide (G-V 2 O 5 ) as novel electrosorption material for the desalination of low molarity saline/brackish water. During the desalination cycles, along with the electrical double layer formation at the graphene layer, ion intercalation is observed in the honeycomb structure of the hydrothermally grown V 2 O 5 layer leading to an improvement in Na +

  • Thallene: graphene-like honeycomb lattice of Tl atoms frozen on single-layer NiSi 2
    2D Mater. (IF 7.14) Pub Date : 2020-09-10
    D V Gruznev, L V Bondarenko, A Y Tupchaya, A N Mihalyuk, S V Eremeev, A V Zotov and A A Saranin

    The post-graphene materials termed also as 2D-Xenes (X = Si, Ge, Sn, Pb, As, Sb or Bi) are atomic-layer sheets comprised of single-element atoms arranged in a honeycomb lattice on a suitable substrate. In the present report, we introduce a new member to the current 2D-Xene family, thallene built of atoms of the Group-III element, thallium (Tl). It is formed when 2/3 monolayer of mobile Tl atoms on

  • Fractional quantum Hall effect in CVD-grown graphene
    2D Mater. (IF 7.14) Pub Date : 2020-09-10
    M Schmitz, T Ouaj, Z Winter, K Rubi, K Watanabe, T Taniguchi, U Zeitler, B Beschoten and C Stampfer

    We show the emergence of fractional quantum Hall states in graphene grown by chemical vapor deposition (CVD) for magnetic fields from below 3 T to 35 T where the CVD-graphene was dry-transferred. Effective composite-fermion filling factors up to ν * = 4 are visible and higher order composite-fermion states (with four flux quanta attached) start to emerge at the highest fields. Our results show that

  • Defect-assisted photoluminescence in hexagonal boron nitride nanosheets
    2D Mater. (IF 7.14) Pub Date : 2020-08-31
    Junkai Ren, Luigi Stagi, Carlo Maria Carbonaro, Luca Malfatti, Maria Francesca Casula, Pier Carlo Ricci, Antonio Esau Del Rio Castillo, Francesco Bonaccorso, Laura Calvillo, Gaetano Granozzi and Plinio Innocenzi

    The development of functional optoelectronic applications based on hexagonal boron nitride nanosheets ( h -BNNs) relies on controlling the structural defects. The fluorescent emission, in particular, has been observed to depend on vacancies and substitutional defects. In the present work, few-layer h -BNNs have been obtained by sonication-assisted liquid-phase exfoliation of their bulk counterpart

  • Tuning the electronic and magnetic properties of pentagraphene through the C1 vacancy
    2D Mater. (IF 7.14) Pub Date : 2020-08-31
    Aaditya Manjanath, Chao-Ping Hsu and Yoshiyuki Kawazoe

    Pentagraphene (PG), a two-dimensional allotrope of carbon with only five-membered rings, was recently predicted to exhibit a wide band gap, an unusual negative Poisson’s ratio, and robust dynamical and thermal stability. However, its potential properties arising from defect engineering of five-membered rings have not been explored yet. In this work, we explore the C1 vacancy in PG using first-principles

  • Strongly adhesive dry transfer technique for van der Waals heterostructure
    2D Mater. (IF 7.14) Pub Date : 2020-08-31
    Suhan Son, Young Jae Shin, Kaixuan Zhang, Jeacheol Shin, Sungmin Lee, Hiroshi Idzuchi, Matthew J Coak, Hwangsun Kim, Jangwon Kim, Jae Hoon Kim, Miyoung Kim, Dohun Kim, Philip Kim and Je-Geun Park

    That one can stack van der Waals materials with atomically sharp interfaces has provided a new material platform of constructing heterostructures. The technical challenge of mechanical stacking is picking up the exfoliated atomically thin materials after mechanical exfoliation without chemical and mechanical degradation. Chemically inert hexagonal boron nitride (hBN) has been widely used for encapsulating

  • Exploring event horizons and Hawking radiation through deformed graphene membranes
    2D Mater. (IF 7.14) Pub Date : 2020-08-31
    Tommaso Morresi, Daniele Binosi, Stefano Simonucci, Riccardo Piergallini, Stephan Roche, Nicola M Pugno and Taioli Simone

    Analogue gravitational systems are becoming an increasing popular way of studying the behaviour of quantum systems in curved spacetime. Setups based on ultracold quantum gases in particular, have been recently harnessed to explore the thermal nature of Hawking’s and Unruh’s radiation that was theoretically predicted almost 50 years ago. For solid state implementations, a promising system is graphene

  • Strain engineering in monolayer WS 2 and WS 2 nanocomposites
    2D Mater. (IF 7.14) Pub Date : 2020-08-24
    Fang Wang, Suhao Li, Mark A Bissett, Ian A Kinloch, Zheling Li and Robert J Young

    There has been a massive growth in the study of transition metal dichalcogenides (TMDs) over the past decade, based upon their interesting and unusual electronic, optical and mechanical properties, such as tuneable and strain-dependent bandgaps. Tungsten disulphide (WS 2 ), as a typical example of TMDs, has considerable potential in applications such as strain engineered devices and the next generation

  • Direct mapping of local Seebeck coefficient in 2D material nanostructures via scanning thermal gate microscopy
    2D Mater. (IF 7.14) Pub Date : 2020-08-17
    Achim Harzheim, Charalambos Evangeli, Oleg V Kolosov and Pascal Gehring

    Studying local variations in the Seebeck coefficient of materials is important for understanding and optimizing their thermoelectric properties, yet most thermoelectric measurements are global over a whole device or material, thus overlooking spatial divergences in the signal and the role of local variation and internal structure. Such variations can be caused by local defects, metallic contacts or

  • Ultrasensitive and rapid detection of malaria using graphene-enhanced surface plasmon resonance
    2D Mater. (IF 7.14) Pub Date : 2020-08-17
    Fan Wu, Jashan Singh, Philip A Thomas, Qi Ge, Vasyl G Kravets, Philip J Day and Alexander N Grigorenko

    Extraordinary optical, electrical and chemical properties of 2D materials have potential to be useful for quick and sensitive detection of pathological diseases. One important example is malaria disease that can progress rapidly and cause death within days. Therefore, fast, accurate and cost-effective malaria diagnosis available at the point of care is urgently needed to facilitate precise treatment

  • Heteroepitaxial growth of sp 2 -hybridized boron nitride multilayer on nickel substrates by CVD: the key role of the substrate orientation
    2D Mater. (IF 7.14) Pub Date : 2020-08-17
    H Prevost, A Andrieux-Ledier, N Dorval, F Fossard, J S Mérot, L Schué, A Plaud, E Héripré, J Barjon and A Loiseau

    sp 2 -hybridized boron nitride is identified as a strategic material for many purposes related to the integration of graphene and two-dimensional materials in devices and the fabrication of van der Waals heterostructures. Thus, it becomes mandatory to have scalable synthesis and characterization procedures for providing suitable and reliable boron nitride material according to these identified needs

  • Flipping exciton angular momentum with chiral phonons in MoSe 2 /WSe 2 heterobilayers
    2D Mater. (IF 7.14) Pub Date : 2020-08-16
    A Delhomme, D Vaclavkova, A Slobodeniuk, M Orlita, M Potemski, D M Basko, K Watanabe, T Taniguchi, D Mauro, C Barreteau, E Giannini, A F Morpurgo, N Ubrig and C Faugeras

    Optical selection rules in monolayers of transition metal dichalcogenides and of their heterostructures are determined by the conservation of the z-component of the total angular momentum—J Z = L Z +S Z – associated with the C 3 rotational lattice symmetry which assumes half integer values corresponding, modulo 3, to distinct states. Here we show, based on polarization resolved and low temperature

  • Resonant photocurrent from a single quantum emitter in tungsten diselenide
    2D Mater. (IF 7.14) Pub Date : 2020-08-16
    Matthias Paur, Aday J Molina-Mendoza, Dmitry Polyushkin, Steffen Michaelis de Vasconcellos, Rudolf Bratschitsch and Thomas Mueller

    Single quantum emitters (SQEs) are the basic building blocks for quantum optics and quantum information technology. Strain-induced defects in monolayer transition metal dichalcogenides (TMDs) have been shown to be a promising platform for the generation of SQEs. In particular, achieving optically active and electrically controlled quantum emitters make these materials attractive for applications ranging

  • Second harmonic generation in two-dimensional transition metal dichalcogenides with growth and post-synthesis defects
    2D Mater. (IF 7.14) Pub Date : 2020-08-16
    William Murray, Michael Lucking, Ethan Kahn, Tianyi Zhang, Kazunori Fujisawa, Nestor Perea-Lopez, Ana Laura Elias, Humberto Terrones, Mauricio Terrones and Zhiwen Liu

    Strong second harmonic generation (SHG) in monolayer transition metal dichalcogenides demonstrates great promise for nonlinear photonic applications. However, to utilize these materials in photonic applications, it is imperative to investigate the robustness of the nonlinear optical properties against various defects introduced during or post synthesis. Here we study the SHG in hexagonal monolayer

  • High-quality electrical transport using scalable CVD graphene
    2D Mater. (IF 7.14) Pub Date : 2020-08-16
    Sergio Pezzini, Vaidotas Mišeikis, Simona Pace, Francesco Rossella, Kenji Watanabe, Takashi Taniguchi and Camilla Coletti

    Producing and manipulating graphene on fab-compatible scale, while maintaining its remarkable carrier mobility, is key to finalize its technological application. We show that a large-scale approach (chemical vapor deposition on Cu followed by polymer-mediated semi-dry transfer) yields single-layer graphene crystals fully comparable, in terms of electronic transport, to micro-mechanically exfoliated

  • CuAu, a hexagonal two-dimensional metal
    2D Mater. (IF 7.14) Pub Date : 2020-08-10
    Georg Zagler, Michele Reticcioli, Clemens Mangler, Daniel Scheinecker, Cesare Franchini and Jani Kotakoski

    Growth of two-dimensional metals has eluded materials scientists since the discovery of the atomically thin graphene and other covalently bound 2D materials. Here, we report a two-atom-thick hexagonal copper-gold alloy, grown through thermal evaporation on freestanding graphene and hexagonal boron nitride. The structures are imaged at atomic resolution with scanning transmission electron microscopy

  • Graphene-based biosensors
    2D Mater. (IF 7.14) Pub Date : 2020-07-27
    Arben Merkoçi

    Description unavailable

  • Orbitally-resolved ferromagnetism of monolayer CrI 3
    2D Mater. (IF 7.14) Pub Date : 2020-03-03
    I V Kashin, V V Mazurenko, M I Katsnelson and A N Rudenko

    Few-layer CrI 3 is the most known example among two-dimensional (2D) ferromagnets, which have attracted growing interest in recent years. Despite considerable efforts and progress in understanding the properties of 2D magnets both from theory and experiment, the mechanism behind the formation of in-plane magnetic ordering in chromium halides is still under debate. Here, we propose a microscopic orbitally-resolved

  • Optimizing Dirac fermions quasi-confinement by potential smoothness engineering
    2D Mater. (IF 7.14) Pub Date : 2020-03-03
    B Brun, N Moreau, S Somanchi, V-H Nguyen, A Mreńca-Kolasińska, K Watanabe, T Taniguchi, J-C Charlier, C Stampfer and B Hackens

    With the advent of high mobility encapsulated graphene devices, new electronic components ruled by Dirac fermions optics have been envisioned and realized. The main building blocks of electron-optics devices are gate-defined p–n junctions, which guide, transmit and refract graphene charge carriers, just like prisms and lenses in optics. The reflection and transmission are governed by the p–n junction

  • Heterostructural one-unit-cell FeSe/SrTiO 3 : from high-temperature superconductivity to topological states
    2D Mater. (IF 7.14) Pub Date : 2020-03-03
    Chaofei Liu and Jian Wang

    High-temperature superconductivity in one-unit-cell (1-UC) FeSe/SrTiO 3 heterostructure has become a research frontier in condensed-matter physics and material science. The superconducting transition temperature ( T c ) of ultrathin FeSe film is significantly enhanced compared to its bulk counterpart and possibly approaches the liquid-nitrogen region according to in situ spectroscopic measurements

  • Transfer assembly for two-dimensional van der Waals heterostructures
    2D Mater. (IF 7.14) Pub Date : 2020-02-28
    Sidi Fan, Quoc An Vu, Minh Dao Tran, Subash Adhikari and Young Hee Lee

    Two-dimensional (2D) van der Waals (vdW) heterostructures with pre-determined properties are key ingredients for the success of advanced electronics and optoelectronics. The construction of vdW heterostructures is a prerequisite to obtain the desired performance with high quality. A typical dry/wet transfer technique is a promising route to physically stack vdW heterostructures via a gentle-energy

  • Van der Waals metallic alloy contacts for multifunctional devices
    2D Mater. (IF 7.14) Pub Date : 2020-02-28
    Kai Xu, Zijing Zhao, Xiaolin Wu and Wenjuan Zhu

    Two-dimensional (2D) semiconductors have shown great potential for electronic and optoelectronic applications. However, their development is limited by a large Schottky barrier at the contacts because of the strong Fermi-level pinning at the metal-semiconductor interface. Here, we demonstrate that 2D metallic Mo 1− x W x Te 2 alloy, bonded to the 2D semiconductor channel MoTe 2 via van der Waals (vdW)

  • A system for the deterministic transfer of 2D materials under inert environmental conditions
    2D Mater. (IF 7.14) Pub Date : 2020-02-28
    Patricia Gant, Felix Carrascoso, Qinghua Zhao, Yu Kyoung Ryu, Michael Seitz, Ferry Prins, Riccardo Frisenda and Andres Castellanos-Gomez

    The isolation of air-sensitive two-dimensional (2D) materials and the race to achieve a better control of the interfaces in van der Waals heterostructures has pushed the scientific community towards the development of experimental setups that allow to exfoliate and transfer 2D materials under inert atmospheric conditions. These systems are typically based on over pressurized N 2 of Ar gloveboxes that

  • Printable and flexible graphene pH sensors utilising thin film melanin for physiological applications
    2D Mater. (IF 7.14) Pub Date : 2020-02-28
    Z Tehrani, S P Whelan, A B Mostert, J V Paulin, M M Ali, E Daghigh Ahmadi, C F O Graeff, O J Guy and D T Gethin

    The application of highly sensitive pH sensors manufactured in volume at low cost has great commercial interest due to an extensive array of potential applications. Such areas include industrial processing, biotechnology and medical diagnostics particularly in the development of point of care (POC) devices. A novel printable electrochemical pH sensor based on graphene and pigment melanin (PGM), was

  • Dopamine-functionalized graphene oxide as a high-performance material for biosensing
    2D Mater. (IF 7.14) Pub Date : 2020-02-27
    Fabio Vulcano, Alessandro Kovtun, Cristian Bettini, Zhenyuan Xia, Andrea Liscio, Fabio Terzi, Aranzazu Heras, Alvaro Colina, Barbara Zanfrognini, Manuela Melucci, Vincenzo Palermo and Chiara Zanardi

    We describe a nanocomposite material for the electrochemical detection of β -nicotinamide adenine dinucleotide (NADH), a coenzyme involved in redox reactions of all living cells and in the detection of many organic species by electrochemical biosensors. The composite is made of nanosheets of electrochemically exfoliated graphene oxide (EGO) covalently functionalized with dopamine (DP) molecules. The

  • Influence of channel thickness on charge transport behavior of multi-layer indium selenide (InSe) field-effect transistors
    2D Mater. (IF 7.14) Pub Date : 2020-02-27
    Milinda Wasala, Prasanna D Patil, Sujoy Ghosh, Rana Alkhaldi, Lincoln Weber, Sidong Lei, Robert Vajtai, Pulickel M Ajayan and Saikat Talapatra

    Atomically thin Van der Waals solids that exhibit direct band gap in their few layer form can substantially impact the field of two dimensional (2D) materials based electronic devices and related applications. Here we report on electronic charge transport behavior of multi layer n -type InSe field-effect transistor (FET) devices fabricated on SiO 2 /Si substrate with seven different channel thicknesses

  • Hematite at its thinnest limit
    2D Mater. (IF 7.14) Pub Date : 2020-02-27
    C Bacaksiz, M Yagmurcukardes, F M Peeters and M V Milošević

    Motivated by the recent synthesis of two-dimensional ##IMG## [http://ej.iop.org/images/2053-1583/7/2/025029/tdmab6d79ieqn001.gif] -Fe 2 O 3 (Balan et al 2018 Nat. Nanotechnol . 13 602), we analyze the structural, vibrational, electronic and magnetic properties of single- and few-layer ##IMG## [http://ej.iop.org/images/2053-1583/7/2/025029/tdmab6d79ieqn002.gif] -Fe 2 O 3 compared to bulk, by ab initio

  • MoS2-enabled dual-mode optoelectronic biosensor using a water soluble variant of μ-opioid receptor for opioid peptide detection.
    2D Mater. (IF 7.14) Pub Date : 2019-12-11
    Chawina De-Eknamkul,Xingwang Zhang,Meng-Qiang Zhao,Wenzhuo Huang,Renyu Liu,A T Charlie Johnson,Ertugrul Cubukcu

    Owing to their unique electrical and optical properties, two-dimensional transition metal dichalcogenides have been extensively studied for their potential applications in biosensing. However, simultaneous utilization of both optical and electrical properties has been overlooked, yet it can offer enhanced accuracy and detection versitility. Here, we demonstrate a dual-mode optoelectronic biosensor

  • Reversible Graphene decoupling by NaCl photo-dissociation.
    2D Mater. (IF 7.14) Pub Date : 2019-04-16
    I Palacio,L Aballe,M Foerster,D G de Oteyza,M García-Hernández,J A Martín-Gago

    We describe the reversible intercalation of Na under graphene on Ir(111) by photo-dissociation of a previously adsorbed NaCl overlayer. After room temperature evaporation, NaCl adsorbs on top of graphene forming a bilayer. With a combination of electron diffraction and photoemission techniques we demonstrate that the NaCl overlayer dissociates upon a short exposure to an X-ray beam. As a result, chlorine

  • Large-area synthesis of high-quality monolayer 1T'-WTe2 flakes.
    2D Mater. (IF 7.14) Pub Date : 2018-05-01
    Carl H Naylor,William M Parkin,Zhaoli Gao,Hojin Kang,Mehmet Noyan,Robert B Wexler,Liang Z Tan,Youngkuk Kim,Christopher E Kehayias,Frank Streller,Yu Ren Zhou,Robert Carpick,Zhengtang Luo,Yung Woo Park,Andrew M Rappe,Marija Drndić,James M Kikkawa,A T Charlie Johnson

    Large-area growth of monolayer films of the transition metal dichalcogenides is of the utmost importance in this rapidly advancing research area. The mechanical exfoliation method offers high quality monolayer material but it is a problematic approach when applied to materials that are not air stable. One important example is 1T'-WTe2, which in multilayer form is reported to possess a large non saturating

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