Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

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