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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 2.5: Vortrag

Montag, 27. September 2021, 12:15–12:45, H7

Charge density waves and superconductivity in kagome metals — •Titus Neupert — Univertity of Zurich, Zurich, Switzerland

Strongly correlated itinerant electron systems exhibit an intertwining of interactions and electronic band fermiology, including flat bands and van Hove points with diverging density of states, nesting patterns, or band degeneracies --for instance of Dirac type or quadratic band touching. The kagome lattice stands out in that it combines all these characteristics, and has thus been subject to many theoretical investigations. However, material realizations of kagome metals with interaction-induced Fermi instabilities have largely been elusive. The recently discovered family of kagome materials AV3Sb5 has filled this gap, displaying charge ordered and superconducting phases with unconventional properties. In my talk, I will discuss the status quo understanding of these instabilities emanating from a critical synopsis of experiments and theoretical studies.