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Scanning tunneling spectroscopy of two-dimensional Dirac materials on substrates with a band gap

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Title
Scanning tunneling spectroscopy of two-dimensional Dirac materials on substrates with a band gap
Author(s)
Zandvliet, Harold J. W.; Qirong Yao; Zhang, Lijie; Bampoulis, Pantelis; Jiao, Zhen
Publication Date
2022-08
Journal
PHYSICAL REVIEW B, v.106, no.8
Publisher
AMER PHYSICAL SOC
Abstract
In this paper we show that conventional current-voltage spectroscopy can provide quantitative information on the dispersion relation of the low-energy electrons of monoelemental group-IV two-dimensional (2D) Dirac materials provided that (1) the 2D material is placed on a substrate with a band gap and (2) the density of states of the scanning tunneling microscopy tip is constant. We have derived an expression for the differential conductivity of a monoelemental group-IV 2D Dirac material that is placed on a substrate with a band gap. The differential conductivity scales as |E - ED|eb|E-ED|, rather than the commonly assumed |E - ED| scaling, where E and ED refer to the energy of the electrons and the Dirac point, respectively. The parameter b is inversely proportional to the Fermi velocity.
URI
https://pr.ibs.re.kr/handle/8788114/12751
DOI
10.1103/PhysRevB.106.085423
ISSN
2469-9950
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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