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  • 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

    更新日期:2020-09-22
  • 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

    更新日期:2020-09-22
  • 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

    更新日期:2020-09-18
  • 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

    更新日期:2020-09-18
  • 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

    更新日期:2020-09-18
  • 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 +

    更新日期:2020-09-16
  • 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

    更新日期:2020-09-11
  • 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

    更新日期:2020-09-11
  • 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

    更新日期:2020-09-01
  • 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

    更新日期:2020-09-01
  • 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

    更新日期:2020-09-01
  • 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

    更新日期:2020-09-01
  • 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

    更新日期:2020-08-28
  • 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

    更新日期:2020-08-28
  • 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

    更新日期:2020-08-28
  • 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

    更新日期:2020-08-28
  • 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

    更新日期:2020-08-28
  • 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

    更新日期:2020-08-28
  • 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

    更新日期:2020-08-28
  • 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

    更新日期:2020-08-28
  • 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

    更新日期:2020-08-28
  • Graphene-based biosensors
    2D Mater. (IF 7.14) Pub Date : 2020-07-27
    Arben Merkoçi

    Description unavailable

    更新日期:2020-08-28
  • 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

    更新日期:2020-03-04
  • 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

    更新日期:2020-03-04
  • 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

    更新日期:2020-03-04
  • 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

    更新日期:2020-03-04
  • 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)

    更新日期:2020-03-04
  • 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

    更新日期:2020-03-04
  • 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

    更新日期:2020-03-04
  • 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

    更新日期:2020-03-04
  • 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

    更新日期:2020-03-04
  • 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

    更新日期:2020-03-04
  • 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

    更新日期:2019-12-11
  • 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

    更新日期:2019-11-01
  • 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

    更新日期:2019-11-01
  • Measuring the dielectric and optical response of millimeter-scale amorphous and hexagonal boron nitride films grown on epitaxial graphene.
    2D Mater. (IF 7.14) Pub Date : 2018-03-17
    Albert F Rigosi,Heather M Hill,Nicholas R Glavin,Sujitra J Pookpanratana,Yanfei Yang,Alexander G Boosalis,Jiuning Hu,Anthony Rice,Andrew A Allerman,Nhan V Nguyen,Christina A Hacker,Randolph E Elmquist,Angela R Hight Walker,David B Newell

    Monolayer epitaxial graphene (EG), grown on the Si face of SiC, is an advantageous material for a variety of electronic and optical applications. EG forms as a single crystal over millimeter-scale areas and consequently, the large scale single crystal can be utilized as a template for growth of other materials. In this work, we present the use of EG as a template to form millimeter-scale amorphous

    更新日期:2019-11-01
  • Trion Valley Coherence in Monolayer Semiconductors.
    2D Mater. (IF 7.14) Pub Date : 2017-09-20
    Kai Hao,Lixiang Xu,Fengcheng Wu,Philipp Nagler,Kha Tran,Xin Ma,Christian Schüller,Tobias Korn,Allan H MacDonald,Galan Moody,Xiaoqin Li

    The emerging field of valleytronics aims to exploit the valley pseudospin of electrons residing near Bloch band extrema as an information carrier. Recent experiments demonstrating optical generation and manipulation of exciton valley coherence (the superposition of electron-hole pairs at opposite valleys) in monolayer transition metal dichalcogenides (TMDs) provide a critical step towards control of

    更新日期:2019-11-01
  • Temperature dependence of electron density and electron-electron interactions in monolayer epitaxial graphene grown on SiC.
    2D Mater. (IF 7.14) Pub Date : 2017-08-05
    Chieh-Wen Liu,Chiashain Chuang,Yanfei Yang,Randolph E Elmquist,Yi-Ju Ho,Hsin-Yen Lee,Chi-Te Liang

    We report carrier density measurements and electron-electron (e-e) interactions in monolayer epitaxial graphene grown on SiC. The temperature (T)-independent carrier density determined from the Shubnikov-de Haas (SdH) oscillations clearly demonstrates that the observed logarithmic temperature dependence of Hall slope in our system must be due to e-e interactions. Since the electron density determined

    更新日期:2019-11-01
  • Low Temperature Metal Free Growth of Graphene on Insulating Substrates by Plasma Assisted Chemical Vapor Deposition.
    2D Mater. (IF 7.14) Pub Date : 2017-01-11
    R Muñoz,C Munuera,J I Martínez,J Azpeitia,C Gómez-Aleixandre,M García-Hernández

    Direct growth of graphene films on dielectric substrates (quartz and silica) is reported, by means of remote electron cyclotron resonance plasma assisted chemical vapor deposition r-(ECR-CVD) at low temperature (650°C). Using a two step deposition process- nucleation and growth- by changing the partial pressure of the gas precursors at constant temperature, mostly monolayer continuous films, with grain

    更新日期:2019-11-01
  • Controlling the layer localization of gapless states in bilayer graphene with a gate voltage.
    2D Mater. (IF 7.14) Pub Date : 2018-01-01
    W Jaskólski,M Pelc,Garnett W Bryant,Leonor Chico,A Ayuela

    Experiments in gated bilayer graphene with stacking domain walls present topological gapless states protected by no-valley mixing. Here we research these states under gate voltages using atomistic models, which allow us to elucidate their origin. We find that the gate potential controls the layer localization of the two states, which switches non-trivially between layers depending on the applied gate

    更新日期:2018-01-01
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