Switching of band inversion and topological surface states by charge density wave.

Abstract:

:Topologically nontrivial materials host protected edge states associated with the bulk band inversion through the bulk-edge correspondence. Manipulating such edge states is highly desired for developing new functions and devices practically using their dissipation-less nature and spin-momentum locking. Here we introduce a transition-metal dichalcogenide VTe2, that hosts a charge density wave (CDW) coupled with the band inversion involving V3d and Te5p orbitals. Spin- and angle-resolved photoemission spectroscopy with first-principles calculations reveal the huge anisotropic modification of the bulk electronic structure by the CDW formation, accompanying the selective disappearance of Dirac-type spin-polarized topological surface states that exist in the normal state. Thorough three dimensional investigation of bulk states indicates that the corresponding band inversion at the Brillouin zone boundary dissolves upon the CDW formation, by transforming into anomalous flat bands. Our finding provides a new insight to the topological manipulation of matters by utilizing CDWs' flexible characters to external stimuli.

journal_name

Nat Commun

journal_title

Nature communications

authors

Mitsuishi N,Sugita Y,Bahramy MS,Kamitani M,Sonobe T,Sakano M,Shimojima T,Takahashi H,Sakai H,Horiba K,Kumigashira H,Taguchi K,Miyamoto K,Okuda T,Ishiwata S,Motome Y,Ishizaka K

doi

10.1038/s41467-020-16290-w

subject

Has Abstract

pub_date

2020-05-18 00:00:00

pages

2466

issue

1

issn

2041-1723

pii

10.1038/s41467-020-16290-w

journal_volume

11

pub_type

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