SKM 2021 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 2: Focus Session: Exotic Charge Density Wave States of Matter: Correlations and Topology (joint session TT/HL)
HL 2.1: Invited Talk
Monday, September 27, 2021, 10:00–10:30, H7
Electronic instabilities of kagomé metals and density waves in the AV3Sb5 materials — •Leon Balents — University of California, Santa Barbara
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 of 90K, and superconductivity 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.