Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 13: Kagome Systems
TT 13.3: Vortrag
Montag, 18. März 2024, 15:30–15:45, H 3010
Non-equilibrium carrier dynamics of the CsV3Sb5 kagome metal — •Kai Frisch1, Niklas Hofmann1, Leonard Weigl1, Johannes Gradl1, Brenden Ortiz2, Andrea Capa Salinas3, Stephen Wilson3, and Isabella Gierz1 — 1University of Regnsburg — 2Oak Ridge national Lab — 3University of California, Santa Barbara
The V planes in AV3Sb5 (A=K, Rb, Cs) form a kagome lattice, resulting in a peculiar electronic structure with coexisting Dirac cones and flat bands [1]. The compounds exhibit a possibly chiral CDW below ∼ 90 K and become superconducting below ∼ 3 K consistent with predictions from a kagome Hubbard model at van Hove filling [2]. We use time- and angle-resolved photoemission spectroscopy to study the non-equilibrium carrier dynamics of CsV3Sb5 in its metallic room temperature phase. We extract the transient electronic temperature of the carriers and interpret the cooling dynamics in terms of strongly coupled optical phonons. Our results shed light onto the coupling between electrons and phonons in kagome metals, relevant for unraveling the mechanism behind the different exotic ground states.
[1] Phys. Rev. Materials, 3 094407 (2019)
[2] Phys. Rev. B 86, 121105(R) (2012)
Keywords: CsV3Sb5; kagome; tr-ARPES; ultrafast dynamics; el.-ph. coupling