SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Kagome Systems

TT 23.1: Vortrag

Dienstag, 28. März 2023, 09:30–09:45, HSZ 304

Broadband optical investigations of the CDW state in Kagome metals AV₃Sb₅ (A = K, Rb, Cs) — •E. Uykur^1,2, M. Wenzel¹, B.R. Ortiz^3,4, S.D. Wilson⁴, S. Winnerl², M. Dressel¹, and A. A. Tsirlin⁵ — ¹1. Physikalisches Institut, Universität Stuttgart, 70569, Stuttgart, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf, Inst. Ion Beam Phys. & Mat. Res., 01328 Dresden, Germany — ³Materials Department and California Nanosystems Institute,University of California Santa Barbara, Santa Barbara, CA, 93106, United States — ⁴Materials Department, University of California Santa Barbara, Santa Barbara, CA, 93106, United States — ⁵Felix Bloch Institute for Solid-State Physics, Leipzig University, 04103 Leipzig, Germany

We present a broadband optical study of non-magnetic Kagome metals AV₃Sb₅ (A = K, Rb, Cs) down to 10 K. Different contributions to the optical spectra have been discussed and compared with the DFT calculations in normal and charge density wave (CDW) states. Spectra reflect the response of the 2D Dirac fermions and are frequency-independent in a broad energy range. Low energies are governed by the itinerant and localized charge carriers that show a spectral weight redistribution below the CDW transition. Our results show that the CDW gaps evolve systematically between the siblings (K<Cs<Rb) in line with their transition temperatures. We further use the experimental spectral weight to gauge the effect of electronic correlations and find it increasing with reducing the size of A.