October 31
@
1:00 PM
–
2:00 PM
UW-Madison Department of Materials Science and Engineering welcomes seminar speaker Assistant Professor Ming Yi. The seminar on “Electronic orders in correlated kagome metal systems” will be on Thursday, Oct. 31 in MS&E 265 from 1 p.m. to 2 p.m.
Abstract
Kagome metals are a class of quantum materials where the geometry of the lattice leads to key signatures in the electronic structure including topological flat bands, Dirac cones, and Van Hove singularities. As the chemical potential is tuned across each of these electronic singularities, emergent orders are theoretically expected, including magnetic orders and charge density wave orders. In recent years, a number of bulk materials have been discovered to exhibit the kagome lattice motif, where electronic orders have also been found to emerge. In this talk, I will discuss progress in understanding the Fe-based magnetic kagome systems FeSn and FeGe. I will also present experimental results on the recently discovered Cr-based kagome material CsCr3Sb5, where superconductivity has been found to emerge under hydrostatic pressure when density-wave orders are suppressed. Specifically, I will show angle-resolved photoemission spectroscopy and resonant inelastic x-ray scattering results that reveal the presence of the kagome flat band in close proximity to the Fermi level and the role of the flat band in the density wave orders at ambient pressure.
Bio
Ming Yi is an associated professor of physics and astronomy at Rice University. Her research interests lie in exploring quantum materials with moderate to strong electron correlations using spectroscopy tools such as angle-resolved photoemission spectroscopy. Her research group has recently been exploring unconventional superconductors, geometrically frustrated lattice systems, electronic topological materials, low dimensional magnetism, and charge density wave systems. Ming received her BS degree in Physics from MIT in 2007, PhD degree in Physics from Stanford in 2014, and worked as a postdoctoral scholar at UC Berkeley before starting her position at Rice University in 2019.