QMC Colloquium - Ming Yi, "Flat bands in geometrically frustrated lattices"

Thursday, February 9, 2023
2:00 p.m.
Hybrid event: 1201 Toll Physics Bldg and on Zoom
Roy Arunkumar
ramkumar@umd.edu

QMC Colloquium

Flat bands in geometrically frustrated lattices

Ming Yi
Rice University

Abstract
Emergent phases often appear when the electronic kinetic energy is small compared to the Coulomb interactions. One approach to seek material systems as hosts of such emergent phases is to realize localization of electronic wavefunctions due to the geometric frustration inherent in the crystal structure, resulting in flat electronic bands. Recently, such efforts have found a wide range of exotic phases in the two-dimensional (2D) kagome lattice, including magnetic order, time-reversal symmetry breaking charge density wave, nematicity, and superconductivity.

In this talk, I will present our recent efforts in experimentally exploring bulk materials hosting flat bands induced from the geometric frustration of the lattice. In particular, I will present three examples of topological flat bands including a magnetic kagome system, a pyrochlore system, and a switchable bipartite lattice that forms within a 2D van der Waals magnet.

Host: Johnpierre Paglione

Zoom Meeting Link: https://umd.zoom.us/j/91301075848

Refreshments 1:30pm in 1117 Toll Physics Bldg.

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