Speaker: Prof. Gil Young Cho (POSTECH)

Date:  January 22nd (Mon) 2024, 4:00pm-
Place: Seminar Room 5 (A615), 6th Floor, ISSP and On Zoom


Title：Emerging  Physics  of  Alternative  Charge-Density  Wave  in  1T-Transition Metal Dichalcogenides

Abstract：
1T-transition metal dichalcogenides (TMD) have been an exciting platform for exploring the intertwinement of charge density waves and strong correlation phenomena. While the David star structure has been conventionally considered as the underlying charge order in the literature, recent scanning tunneling probe
experiments on several monolayer 1T-TMD materials have motivated a new, alternative structure, namely the anion-centered David star structure. In this paper, we show that this novel anion-centered David star structure manifestly breaks inversion symmetry, resulting in flat bands with pronounced Rashba spin-orbit couplings. These distinctive features unlock novel possibilities and functionalities for 1T-TMDs, including the giant spin Hall effect, the emergence of Chern bands, and spin liquid that spontaneously breaks crystalline rotational symmetry. Our findings establish promising avenues for exploring emerging quantum phenomena of monolayer 1T-TMDs with this novel noncentrosymmetric structure.


The Zoom URL will be sent to the registered e-mail address before the seminar.