Orbital-collaborative Charge Density Wave in Monolayer VTe2

Abstract

Charge density waves in transition metal dichalcogenides have been intensively studied for their close correlation with Mott insulator, charge-transfer insulator, and superconductor. VTe2 monolayer recently comes into sight because of its prominent electron correlations and the mysterious origin of CDW orders. As a metal of more than one type of charge density waves, it involves complicated electron-electron and electron-phonon interactions. Through a scanning tunneling microscopy study, we observed triple-Q 4-by-4 and single-Q 4-by-1 modulations with significant charge and orbital separation. The triple-Q 4-by-4 order arises strongly from the p-d hybridized states, resulting in a charge distribution in agreement with the V-atom clustering model. Associated with a lower Fermi level, the local single-Q 4-by-1 electronic pattern is generated with the p-d hybridized states remaining 4-by-4 ordered. In the spectroscopic study, orbital- and atomic- selective charge-density-wave gaps with the size up to ~400 meV were resolved on the atomic scale.

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Cited by in corpus (5)

• High magnetic field induced crossover from the Kondo to Fermi liquid behavior in 1$T$-VTe${}_2$ single crystals
• Novel 2D vanadium sulphides: synthesis, atomic structure engineering and charge density waves
• Electronic states of multilayer VTe2: quasi-one-dimensional Fermi surface and implications to charge-density waves
• 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${}_2$