|DATE||October 08 (Fri), 2021|
|SPEAKER||Hyo Won Kim|
|TITLE||Control of Domain Boundary and Topological States in 1T'-MoTe2|
Monolayer group VI two-dimensional (2D) transition metal dichalcogenides with 1T’ phase, 1T’-MX2, where M is Mo or W and X represents S, Se, or Te have garnered much attention as notable 2D topological insulators (TIs). Furthermore, 1T’-MoTe2 and WTe2 are known as higher-order TIs, which host topological states at lower-boundaries such as corners and hinge states. However, such topological properties have not been experimentally observed yet. Here, I introduce a novel method for structural redesign of controlled and reproducible ferroelastic switching between three orientational variants of the 1T’ phase of MoTe2 using the tip of a scanning tunnelling microscope and report the first experimental demonstration to control topological Weyl-semimetallic states governed by non-symmorphic symmetry and to create corner states in 1T’-MoTe2 using by scanning tunnelling microscopy and spectroscopy.