Home » notice » Seminar: Neutron Scattering and Thermal Transport Studies of Novel Magnetic Excitations in Low-Dimensional Magnets

Seminar: Neutron Scattering and Thermal Transport Studies of Novel Magnetic Excitations in Low-Dimensional Magnets

Xianglin Ke(柯祥林)

Department of Physics and Astronomy,
Michigan State University

Time:15:30-17:00, Tuesday, June 27th, 2023

Location:Room 242, East 4, Zijingang Campus


Low-dimensional quantum magnetism has been one of actively pursued research topics in the past decades. After a brief overview of the research program, I will present our recent neutron scattering and thermal transport studies of magnetic excitations in two low-dimensional magnets. The first one is a 2D insulating van der Waals ferromagnet VI3. This material exhibits an anomalous thermal Hall effect with large thermal Hall signal over a wide temperature region. The observed thermal Hall effect is of dual nature, dominated by topological magnons hosted by the ferromagnetic honeycomb lattice at higher temperatures while being driven by magnon polarons via magnon-phonon coupling at lower temperatures. The second example I will present is a unique quasi-1D system, Cu2(OH)3Br, which consists of weakly-coupled, ferromagnetic and antiferromagnetic alternating chains. I will show that this system exhibits a coexistence of two different magnetic quasiparticles, magnons arising from ferromagnetic chains and spinons from antiferromagnetic chains. Furthermore, these two magnetic quasiparticles interact via weak interchain interactions.

About the speaker:

Prof. Xianglin Ke is a professor in the Department of Physics and Astronomy at Michigan State University. He obtained his PhD from University of Wisconsin-Madison in 2006. He then was a postdoctoral scholar at Pennsylvania State University in 2006-2009 and a Clifford Shull Fellow at Oak Ridge National Laboratory in 2009-2012 before joining Michigan State University as an Assistant Professor. Dr. Ke was promoted to be an Associate Professor in 2018 and then a Full Professor in 2023. Combining material synthesis, neutron scattering, and various bulk electronic and thermal transport techniques, Dr. Ke’s research group is focused on the studies of emergent phenomena and understand the underlying mechanism in quantum materials.
Biography: https://web.pa.msu.edu/people/ke/