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 2D Materials   [SJR: 4.344]   [H-I: 8]   [8 followers]  Follow         Hybrid journal (It can contain Open Access articles)    ISSN (Online) 2053-1583    Published by IOP  [71 journals]
• Emergence of Dirac-like bands in the monolayer limit of epitaxial Ge films
on Au(1 1 1)
• Authors: Niels B M Schröter; Matthew D Watson, Liam B Duffy, Moritz Hoesch, Yulin Chen, Thorsten Hesjedal Timur K Kim
First page: 031005
Abstract: After the discovery of Dirac fermions in graphene, it has become a natural question to ask whether it is possible to realize Dirac fermions in other two-dimensional (2D) materials as well. In this work, we report the discovery of multiple Dirac-like electronic bands in ultrathin Ge films grown on Au(1 1 1) by angle-resolved photoelectron spectroscopy. By tuning the thickness of the films, we are able to observe the evolution of their electronic structure when passing through the monolayer limit. Our discovery may signify the synthesis of germanene, a 2D honeycomb structure made of Ge, which is a promising platform for exploring exotic topological phenomena and enabling potential applications.
Citation: 2D Materials
PubDate: 2017-07-12T23:00:00Z
DOI: 10.1088/2053-1583/aa7963
Issue No: Vol. 4, No. 3 (2017)

• Valley-polarized quantum transport generated by gauge fields in graphene
• Authors: Mikkel Settnes; Jose H Garcia Stephan Roche
First page: 031006
Abstract: We report on the possibility to simultaneously generate in graphene a bulk valley-polarized dissipative transport and a quantum valley Hall effect by combining strain-induced gauge fields and real magnetic fields. Such unique phenomenon results from a ‘resonance/anti-resonance’ effect driven by the superposition/cancellation of superimposed gauge fields which differently affect time reversal symmetry. The onset of a valley-polarized Hall current concomitant to a dissipative valley-polarized current flow in the opposite valley is revealed by a ##IMG## [http://ej.iop.org/images/2053-1583/4/3/031006/tdmaa7cbdieqn001.gif] {${{e}^{2}}/h$} Hall conductivity plateau. We employ efficient linear scaling Kubo transport methods combined with a valley projection scheme to access valley-dependent conductivities and show that the results are robust against disorder.
Citation: 2D Materials
PubDate: 2017-07-19T23:00:00Z
DOI: 10.1088/2053-1583/aa7cbd
Issue No: Vol. 4, No. 3 (2017)

• Observation of forbidden phonons, Fano resonance and dark excitons by
resonance Raman scattering in few-layer WS 2
• Authors: Qing-Hai Tan; Yu-Jia Sun, Xue-Lu Liu, Yanyuan Zhao, Qihua Xiong, Ping-Heng Tan Jun Zhang
First page: 031007
Abstract: The optical properties of the two-dimensional (2D) crystals are dominated by tightly bound electron–hole pairs (excitons) and lattice vibration modes (phonons). The exciton-phonon interaction is fundamentally important to understand the optical properties of 2D materials and thus helps to develop emerging 2D crystal based optoelectronic devices. Here, we presented the excitonic resonant Raman scattering (RRS) spectra of few-layer WS 2 excited by 11 lasers lines covered all of A, B and C exciton transition energies at different sample temperatures from 4 to 300 K. As a result, we are not only able to probe the forbidden phonon modes unobserved in ordinary Raman scattering, but also can determine the bright and dark state fine structures of 1s A exciton. In particular, we also observed the quantum interference between low-energy discrete phonon and exciton continuum under resonant excitation. Our works pave a way to understand the exciton-phonon coupling and many-body ef...
Citation: 2D Materials
PubDate: 2017-07-19T23:00:00Z
DOI: 10.1088/2053-1583/aa79bb
Issue No: Vol. 4, No. 3 (2017)

• Spontaneous doping on high quality talc-graphene-hBN van der Waals
heterostructures
• Authors: E Mania; A B Alencar, A R Cadore, B R Carvalho, K Watanabe, T Taniguchi, B R A Neves, H Chacham L C Campos
First page: 031008
Abstract: Steady doping, added to its remarkable electronic properties, would make graphene a valuable commodity in the solar cell market, as energy power conversion could be substantially increased. Here we report a graphene van der Waals heterostructure which is able to spontaneously dope graphene ( p -type) up to n ~ 2.2  ×  10 13 cm −2 while providing excellent charge mobility ( ##IMG## [http://ej.iop.org/images/2053-1583/4/3/031008/tdmaa76f4ieqn001.gif] {$\mu$} ~ 25 000 cm 2 V −1 s −1 ). Such properties are achieved via deposition of graphene on atomically flat layered talc, a natural and abundant dielectric crystal. Raman investigation shows a preferential charge accumulation on graphene-talc van der Waals heterostructures, which are investigated through the electronic properties of talc/graphene/hBN heterostructure devices. These heterostructures preserve graphene’s good electronic quality, verified...
Citation: 2D Materials
PubDate: 2017-07-19T23:00:00Z
DOI: 10.1088/2053-1583/aa76f4
Issue No: Vol. 4, No. 3 (2017)

• Photodiodes based in La 0.7 Sr 0.3 MnO 3 /single layer MoS 2 hybrid
vertical heterostructures
• Authors: Yue Niu; Riccardo Frisenda, Simon A Svatek, Gloria Orfila, Fernando Gallego, Patricia Gant, Nicolás Agraït, Carlos Leon, Alberto Rivera-Calzada, David Pérez De Lara, Jacobo Santamaria Andres Castellanos-Gomez
First page: 034002
Abstract: The fabrication of artificial materials by stacking of individual two-dimensional (2D) materials is amongst one of the most promising research avenues in the field of 2D materials. Moreover, this strategy to fabricate new man-made materials can be further extended by fabricating hybrid stacks between 2D materials and other functional materials with different dimensionality making the potential number of combinations almost infinite. Among all these possible combinations, mixing 2D materials with transition metal oxides can result especially useful because of the large amount of interesting physical phenomena displayed separately by these two material families. We present a hybrid device based on the stacking of a single layer MoS 2 onto a lanthanum strontium manganite (La 0.7 Sr 0.3 MnO 3 ) thin film, creating an atomically thin device. It shows a rectifying electrical transport with a ratio of 10 3 , and a photovoltaic effect with
Citation: 2D Materials
PubDate: 2017-07-19T23:00:00Z
DOI: 10.1088/2053-1583/aa797b
Issue No: Vol. 4, No. 3 (2017)

• Nanostructural origin of giant Rashba effect in intercalated graphene
• Authors: M Krivenkov; E Golias, D Marchenko, J Sánchez-Barriga, G Bihlmayer, O Rader A Varykhalov
First page: 035010
Abstract: To enhance the spin–orbit interaction in graphene by a proximity effect without compromising the quasi-free-standing dispersion of the Dirac cones means balancing the opposing demands for strong and weak graphene–substrate interaction. So far, only the intercalation of Au under graphene/Ni(1 1 1) has proven successful, which was unexpected since graphene prefers a large separation (∼ ##IMG## [http://ej.iop.org/images/2053-1583/4/3/035010/tdmaa7ad8ieqn001.gif] {$3.3~{\mathring{\rm A}}$} ) from a Au monolayer in equilibrium. Here, we investigate this system and find the solution in a nanoscale effect. We reveal that the Au largely intercalates as nanoclusters. Our density functional theory calculations show that the graphene is periodically stapled to the Ni substrate, and this attraction presses graphene and Au nanoclusters together. This, in turn, causes a Rashba effect of the giant magnitude observed in experiment. Our findings show that nanopatterning of t...
Citation: 2D Materials
PubDate: 2017-07-19T23:00:00Z
Issue No: Vol. 4, No. 3 (2017)

• Current rectification and asymmetric photoresponse in MoS 2
stacking-induced homojunctions
• Authors: Juan Xia; Qingsheng Zeng, Jiadong Zhou, Wu Zhou, Qing Zhang, Jiaxu Yan, Zheng Liu Ze Xiang Shen
First page: 035011
Abstract: The layer-dependent electronic and optoelectronic properties in transition metal dichalcogenides (TMDs) have been investigated extensively. Current rectification behavior has been demonstrated using heterojunctions constructed from different TMDs materials, as well as single layer-few layer homojunctions utilizing the layer-dependent behavior of TMDs. MoS 2 is the best known TMDs and high quality few-layer samples with different stacking sequences can be facilely obtained by the chemical vapor deposition (CVD) method. In this paper, we firstly report the stacking-dependent junctions formed by the interface of AA-AB stacked bilayer MoS 2 samples, together with AA bilayer-single layer (AA-1L) and AB bilayer-single layer (AB-1L) junctions. Current rectification and asymmetric photoresponse are observed for the unique AA-AB junctions, similar to that of bilayer-monolayer (2L-1L) junctions. Current mappings clearly show that the photocurrents are mainly localized ...
Citation: 2D Materials
PubDate: 2017-07-19T23:00:00Z
DOI: 10.1088/2053-1583/aa79db
Issue No: Vol. 4, No. 3 (2017)

• All-SPEEK flexible supercapacitor exploiting laser-induced graphenization
• Authors: A Lamberti; M Serrapede, G Ferraro, M Fontana, F Perrucci, S Bianco, A Chiolerio S Bocchini
First page: 035012
Abstract: Flexible supercapacitors have emerged as one of the more promising and efficient space-saving energy storage system for portable and wearable electronics. Laser-induced graphenization has been recently proposed as a powerful and scalable method to directly convert a polymeric substrate into a 3D network of few layer graphene as high-performance supercapacitor electrode. Unfortunately this outstanding process has been reported to be feasible only for few thermoplastic polymers, strongly limiting its future developments. Here we show that laser induced graphenization of sulfonated poly(ether ether ketone) (SPEEK) can be obtained and the mechanism of this novel process is proposed. The resulting material can act at the same time as binder-free electrode and current collector. Moreover SPEEK is also used both as separator and polymeric electrolyte allowing the assembling of an all-SPEEK flexible supercapacitor. Chemico-physical characterization provides deep understanding of the las...
Citation: 2D Materials
PubDate: 2017-07-19T23:00:00Z
DOI: 10.1088/2053-1583/aa790e
Issue No: Vol. 4, No. 3 (2017)

• Hydrogen-induced structural transition in single layer ReS 2
• Authors: M Yagmurcukardes; C Bacaksiz, R T Senger H Sahin
First page: 035013
Abstract: By performing density functional theory-based calculations, we investigate how structural, electronic and mechanical properties of single layer ReS 2 can be tuned upon hydrogenation of its surfaces. It is found that a stable, fully hydrogenated structure can be obtained by formation of strong S-H bonds. The optimized atomic structure of ReS 2 H 2 is considerably different than that of the monolayer ReS 2 which has a distorted-1T phase. By performing phonon dispersion calculations, we also predict that the Re 2 -dimerized 1T structure (called 1T ##IMG## [http://ej.iop.org/images/2053-1583/4/3/035013/tdmaa78c8ieqn001.gif] {${{}^{\text{R}{{\text{e}}_{2}}}}$} ) of the ReS 2 H 2 is dynamically stable. Unlike the bare ReS 2 the 1T ##IMG## [http://ej.iop.org/images/2053-1583/4/3/035013/tdmaa78c8ieqn002.gif] {${{}^{\text{R}{{\text{e}}_{2}}}}$} –ReS 2...
Citation: 2D Materials
PubDate: 2017-07-19T23:00:00Z
DOI: 10.1088/2053-1583/aa78c8
Issue No: Vol. 4, No. 3 (2017)

• Chiral anomaly and anomalous finite-size conductivity in graphene
• Authors: Shun-Qing Shen; Chang-An Li Qian Niu
First page: 035014
Abstract: Graphene is a monolayer of carbon atoms packed into a hexagon lattice to host two spin degenerate pairs of massless two-dimensional Dirac fermions with different chirality. It is known that the existence of non-zero electric polarization in reduced momentum space which is associated with a hidden chiral symmetry will lead to the zero-energy flat band of a zigzag nanoribbon and some anomalous transport properties. Here it is proposed that the Adler–Bell–Jackiw chiral anomaly or non-conservation of chiral charges of Dirac fermions at different valleys can be realized in a confined ribbon of finite width, even in the absence of a magnetic field. In the laterally diffusive regime, the finite-size correction to conductivity is always positive and is inversely proportional to the square of the lateral dimension W , which is different from the finite-size correction inversely proportional to W from the boundary modes. This anomalous finite-size conductivity reveals the sig...
Citation: 2D Materials
PubDate: 2017-07-19T23:00:00Z
DOI: 10.1088/2053-1583/aa77b9
Issue No: Vol. 4, No. 3 (2017)

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