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      Dirac Signature in Germanene on Semiconducting Substrate

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          Abstract

          2D Dirac materials supported by nonmetallic substrates are of particular interest due to their significance for the realization of the quantum spin Hall effect and their application in field‐effect transistors. Here, monolayer germanene is successfully fabricated on semiconducting germanium film with the support of a Ag(111) substrate. Its linear‐like energy–momentum dispersion and large Fermi velocity are derived from the pronounced quasiparticle interference patterns in a √3 × √3 superstructure. In addition to Dirac fermion characteristics, the theoretical simulations reveal that the energy gap opens at the Brillouin zone center of the √3 × √3 restructured germanene, which is evoked by the symmetry‐breaking perturbation potential. These results demonstrate that the germanium nanosheets with √3 × √3 germanene can be an ideal platform for fundamental research and for the realization of high‐speed and low‐energy‐consumption field‐effect transistors.

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          Author and article information

          Contributors
          wangjo@mail.ihep.ac.cn
          zphu@nankai.edu.cn
          yi_du@uow.edu.au
          Journal
          Adv Sci (Weinh)
          Adv Sci (Weinh)
          10.1002/(ISSN)2198-3844
          ADVS
          Advanced Science
          John Wiley and Sons Inc. (Hoboken )
          2198-3844
          04 May 2018
          July 2018
          : 5
          : 7 ( doiID: 10.1002/advs.v5.7 )
          Affiliations
          [ 1 ] Institute for Superconducting and Electronic Materials (ISEM) Australian Institute for Innovative Materials (AIIM) University of Wollongong Innovation Campus North Wollongong NSW 2500 Australia
          [ 2 ] BUAA‐UOW Joint Centre Beihang University Haidian District Beijing 100091 P. R. China
          [ 3 ] Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 P. R. China
          [ 4 ] School of Physics Nankai University Tianjin 300071 P. R. China
          [ 5 ] Electron Microscopy Centre University of Wollongong Wollongong NSW 2525 Australia
          [ 6 ] Center of Materials Physics and Chemistry, and Department of Physics Beihang University Beijing 100191 P. R. China
          [ 7 ] School of Physics Beihang University Haidian District Beijing 100091 P. R. China
          Author notes
          Article
          ADVS647
          10.1002/advs.201800207
          6051399
          © 2018 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim

          This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

          Page count
          Figures: 7, Tables: 0, Pages: 8, Words: 6020
          Product
          Funding
          Funded by: Australian Research Council (ARC) Discovery Projects
          Award ID: DP140102581
          Award ID: DP160102627
          Award ID: DP170101467
          Award ID: LE0882813
          Award ID: LE120100104
          Funded by: National Natural Science Foundation of China
          Award ID: 21773124
          Award ID: 11575227
          Award ID: 51472016
          Award ID: 51672018
          Funded by: Special Program for Applied Research on Super Computation of the NSFC‐Guangdong Joint Fund
          Award ID: U1501501
          Funded by: BUAA‐UOW Joint Research Centre Small Grant
          Categories
          Full Paper
          Full Papers
          Custom metadata
          2.0
          advs647
          July 2018
          Converter:WILEY_ML3GV2_TO_NLMPMC version:version=5.4.3 mode:remove_FC converted:18.07.2018

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