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 VTe${}_2$, that hosts a charge density wave (CDW) coupled with the band inversion involving V3$d$ and Te5$p$ 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 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.

46 pages, 6 main figures, 12 supplementary figures

References in corpus (3)

• Topological Insulators with Inversion Symmetry
• Unexpected mass acquisition of Dirac fermions at the quantum phase transition of a topological insulator
• Observation of spin-polarized bands and domain-dependent Fermi arcs in polar Weyl semimetal MoTe${}_2$

Cited by in corpus (17)

• Charge density wave induced nodal lines in LaTe${}_3$
• High magnetic field induced crossover from the Kondo to Fermi liquid behavior in 1$T$-VTe${}_2$ single crystals
• A novel $\sqrt{19}\times \sqrt{19}$ superstructure in epitaxially grown 1T-TaTe${}_2$
• Observation of local atomic displacements intrinsic to the double zigzag chain structure of 1T-MTe2 (M = V, Nb, Ta)
• Electronic states of multilayer VTe2: quasi-one-dimensional Fermi surface and implications to charge-density waves
• Discovery of a Topological Charge Density Wave
• Ultrafast all-optical manipulation of the charge-density-wave in VTe${}_2$
• Unveiling the orbital-selective electronic band reconstruction through the structural phase transition in TaTe${}_2$
• Ultrafast Control of Crystal Structure in a Topological Charge-Density-Wave Material
• Strain-Induced Charge Density Waves with Emergent Topological States in Monolayer NbSe2
• Darkness in interlayer and charge density wave states of 2H-TaS2
• Observation of converse flexoelectric effect in topological semimetals
• Unusual photoinduced crystal structure dynamics in TaTe${}_2$ with double zigzag chain superstructure
• Intercalation of Alkali Metal into WTe2, the Crystal Structure of A0.5WTe2 and Observation of a Metal-to-Semiconductor Transition
• Electronic Landscape of Group-5 Transition Metal Ditellurides $M$Te${}_2$ ($M$ = V, Nb, Ta): Multiple Crystal Phases with Local Bonds and Flat Bands
• Interlayer coupling driven stabilization and superconductivity in bilayer CoTe${}_2$
• Kramers nodal line in the charge density wave state of YTe${}_3$ and the influence of twin domains