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Inna Vishik: Electronic Correlations and Topology across Tc in a Magnetic Weyl Semimetal

March 10 @ 10:00 am - 11:00 am

Meeting ID: 684 7017 3961

Passcode: 113399

Speaker: Inna Vishik, Associate Professor in Physics and Astronomy at UC Davis

Abstract: Co3Sn2S2 is a magnetic Weyl semimetal below its Curie temperature (Tc) of 177K. I will discuss our recent spatial and temperature-dependent angle-resolved photoemission spectroscopy (ARPES) studies in this system.  Across Tc, we observe signatures of a topological phase transition, but also observe changes in bulk bands which are inconsistent with a simple lifting of exchange interactions, suggesting enhanced electronic correlations in the regime without long-range magnetic order.  I will also discuss spatial-dependent microARPES data which quantify the characteristic differences between Sn- and S- terminated surfaces.

Ref: Rossi, Ivanov, et al, PRB 104, 155115 (2021)

Bio:  Inna Vishik is an Associate Professor in Physics and Astronomy at UC Davis.  Since 2016, her lab has been performing ARPES and ultrafast optics experiments to elucidate emergent phenomena in superconducting, correlated, and topological quantum materials.  Prior to this, she received her PhD at Stanford and was subsequently a Pappalardo Postdoctoral fellow at MIT.