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 Communjournal_title
Nature communicationsauthors
Song YH,Jia ZY,Zhang D,Zhu XY,Shi ZQ,Wang H,Zhu L,Yuan QQ,Zhang H,Xing DY,Li SCdoi
10.1038/s41467-018-06635-xsubject
Has Abstractpub_date
2018-10-04 00:00:00pages
4071issue
1issn
2041-1723pii
10.1038/s41467-018-06635-xjournal_volume
9pub_type
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