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Title: Two-dimensional Dirac signature of germanene

The structural and electronic properties of germanene coated Ge{sub 2}Pt clusters have been determined by scanning tunneling microscopy and spectroscopy at room temperature. The interior of the germanene sheet exhibits a buckled honeycomb structure with a lattice constant of 4.3 Å and a buckling of 0.2 Å. The zigzag edges of germanene are reconstructed and display a 4× periodicity. The differential conductivity of the interior of the germanene sheet has a V-shape, which is reminiscent of the density of states of a two-dimensional Dirac system. The minimum of the differential conductivity is located close to the Fermi level and has a non-zero value, which we ascribe to the metallic character of the underlying Ge{sub 2}Pt substrate. Near the reconstructed germanene zigzag edges the shape of the differential conductivity changes from a V-shape to a more parabolic-like shape, revealing that the reconstructed germanene zigzag edges do not exhibit a pronounced metallic edge state.
Authors:
; ; ;  [1]
  1. Physics of Interfaces and Nanomaterials Group, MESA+ Institute for Nanotechnology and University of Twente, P.O. Box 217, 7500AE Enschede (Netherlands)
Publication Date:
OSTI Identifier:
22482074
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BUCKLING; DENSITY OF STATES; FERMI LEVEL; GERMANENE; HONEYCOMB STRUCTURES; LATTICE PARAMETERS; PERIODICITY; SCANNING TUNNELING MICROSCOPY; SHAPE; SPECTROSCOPY; SUBSTRATES; TEMPERATURE RANGE 0273-0400 K