Time: 09:30am (UTC/GMT+8:00, Beijing/Shanghai), May 9 (Mon.), 2022

Zoom Meeting URL: https://us06web.zoom.us/j/9495597503?pwd=UFVMUUVxb3pDUHRkWEFQY3MzRjJYUT09 

Meeting Room ID: 949 559 7503

Passcode: 2021

Speaker: Dr. Zhang Xiao-xiao (RIKEN)

Abstract:

The Dirac type of quantum matter brings new blood to the vast range of condensed matter physics, not only in terms of the rich physics and application prospect displayed in the equilibrium, but also in its connection with rapidly developing probes into the open and nonequilibrium systems. With these two aspects in mind and characterized by magnetism and magnetic field effects, we introduce some of our results with connection to experimental investigation, especially focusing on the following. (1) How is the 3D quantum Hall effect in Weyl semimetal different from the conventional one; (2) Ultrafast topological spin texture dichroism can be realized in the platform of surface ARPES pump-probe; (3) What is the interplay between magnetic field and the ubiquitous skin effect in non-Hermitian systems.

Reference:

[1] X.-X. Zhang, N. Nagaosa, Anisotropic 3D quantum Hall effect and magnetotransport in mesoscopic Weyl semimetals, Nano Lett. 22, 3033 (2022)
[2] X.-X. Zhang, N. Nagaosa, Nonequilibrium topological spin textures in momentum space, Proc. Natl. Acad. Sci. 119, e2116976119 (2022)
[3] M. Lu, X.-X. Zhang, M. Franz, Magnetic suppression of non-Hermitian skin effect, Phys. Rev. Lett. 127, 256402 (2021)

About the Speaker:

After a bachelor degree from Tsinghua University and a doctoral degree from the University of Tokyo, the speaker continued his condensed matter theory study since 2018 at the University of British Columbia (UBC) branch of the MaxPlanck-UBC-UTokyo Center for Quantum Materials and is now working at the RIKEN institute.