with double zigzag chains

Layered transition metal dichalcogenide (TMDC) has been a well-known system to host a variety of charge density waves (CDW) reflecting its quasi-two-dimensionality. More recently, there has been increasing interest in spin-orbit coupling effect and topological aspects of TMDC. VTe₂ has a trigonal CdI₂-type structure (so-called 1T phase) at high temperature, consisting of trigonal layers formed by edge-sharing VTe₆ octahedra. Below ~485 K, it undergoes a peculiar structural phase transition to the monoclinic 1T” phase. In this phase, VTe₂ exhibits the 3×1×3 superstructure characterized by the formation of double zigzag chains of vanadium [1], which has been discussed in terms of CDW. In this talk, we report on the peculiar modification of the electronic structures via the 1T-1T” phase transition clarified by utilizing angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations.
[1] K. D. Bronsema et al., Solid State Commun. 40, 629 (1981).