Study of Topological Quantum Materials under High-Pressure

Abstract

In this article, the effects of pressure on topological quantum materials, a polar semiconductor BiTeBr and a type-II Dirac semimetal PdTe₂, are reviewed. The first topic is the pressure-induced trivial-nontrivial electronic transition in BiTeBr. I explain that the topological transition was clearly revealed by the Wilson-loop analysis used for evaluating topological Z₂ invariants. The second topic is the introduction of superconducting properties of PdTe₂ under multi-extreme conditions. I report an unusual superconducting phase diagram in addition to experimental results of electrical resistivity and ac-susceptibility in PdTe₂.