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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

PIRSA:21040012  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Electronic instabilities of kagomé metals and density waves in the AV3Sb5 materials
Speaker(s): Leon Balents
Abstract:

Recently, a new class of kagomé metals, with chemical formula AV3Sb5, where A = K, Rb, or Cs, have emerged as an exciting realization of quasi-2D correlated metals with hexagonal symmetry. These materials have been shown to display several electronic orders setting in through thermodynamic phase transitions: multi-component (“3Q”) hexagonal charge density wave (CDW) order below a Tc≈90K, andsuperconductivity with critical temperature of 2.5K or smaller, and some indications of nematicity and one-dimensional charge order in the normal and superconducting states. Other experiments show a strong anomalous Hall effect, suggesting possible topological physics.  I will discuss a theory of these phenomena based in part on strong interactions between electrons at saddle points, as well as ideas related to different competing density wave orders.

Date: 26/04/2021 - 12:30 pm
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