Speaker: Dr. Tianyu Liu (The University of British Columbia)

Date & Time: Wednesday, January 23, 2019, 2pm-3pm

Room: Seminar Room B

Title: Strain-induced gauge field in Dirac matter

Abstract: Dirac materials have been a thriving and prosperous direction in modern condensed matter physics. Their bulk bands can linearly attach at discrete points, leading to arc surface states. These materials are exemplified by Dirac/Weyl semimetals, Dirac/Weyl superconductors, and Dirac/Weyl magnets. Owing to the relativistic band structure, these materials have unique responses to the applied elastic crystalline lattice deformations, which can induce pseudo-magnetic and pseudo-electric fields near the band crossings and produce transports distinguished from those caused by ordinary magnetic and electric fields. In this seminar, I will demonstrate exotic transports due to the strain-induced gauge field. I will first elucidate that a simple bend deformation can induce a pseudo-magnetic field that can give rise to Shubnikov-de Haas oscillation in Weyl semimetals. Then I will elaborate that strain can Landau quantize charge neutral Bogoliubov quasiparticles as well and result in thermal conductivity quantum oscillation in Weyl superconductors. Lastly, I will consider the strain-induced gauge field beyond the fermionic paradigm and explain various quantum anomalies in Weyl ferromagnets.