Observation of Coulomb gap in the quantum spin Hall candidate single-layer 1T'-WTe2.

Abstract:

:The two-dimensional topological insulators host a full gap in the bulk band, induced by spin-orbit coupling (SOC) effect, together with the topologically protected gapless edge states. However, it is usually challenging to suppress the bulk conductance and thus to realize the quantum spin Hall (QSH) effect. In this study, we find a mechanism to effectively suppress the bulk conductance. By using the quasiparticle interference technique with scanning tunneling spectroscopy, we demonstrate that the QSH candidate single-layer 1T'-WTe2 has a semimetal bulk band structure with no full SOC-induced gap. Surprisingly, in this two-dimensional system, we find the electron-electron interactions open a Coulomb gap which is always pinned at the Fermi energy (EF). The opening of the Coulomb gap can efficiently diminish the bulk state at the EF and supports the observation of the quantized conduction of topological edge states.

journal_name

Nat Commun

journal_title

Nature communications

authors

Song YH,Jia ZY,Zhang D,Zhu XY,Shi ZQ,Wang H,Zhu L,Yuan QQ,Zhang H,Xing DY,Li SC

doi

10.1038/s41467-018-06635-x

subject

Has Abstract

pub_date

2018-10-04 00:00:00

pages

4071

issue

1

issn

2041-1723

pii

10.1038/s41467-018-06635-x

journal_volume

9

pub_type

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