Regensburg 2025 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 6: Phase Transformations

MM 6.5: Talk

Monday, March 17, 2025, 16:45–17:00, H10

Chirality in the Kagome Metal CsV₃Sb₅ — H.J. Elmers¹, O. Tkach¹, Y. Lytvynenko¹, P. Yogi¹, M. Schmitt^2,3, D. Biswas², J. Liu², S.V. Chernov⁴, Q. Nguyen⁵, M. Hoesch⁴, D. Kutnyakhov⁴, N. Wind^4,6, L. Wenthaus⁴, M. Scholz⁴, K. Rossnagel^4,6, A. Gloskovskii⁴, C. Schlueter⁴, A. Winkelmann⁷, A.-A. Haghighirad⁸, T.-L. Lee², M. Sing³, R. Claessen³, M. Le Tacon⁸, J. Demsar¹, G. Schönhense¹, and •O. Fedchenko¹ — ¹JGU Mainz, Germany — ²DIAMOND, Didcot, United Kingdom — ³Physikalisches Institut Würzburg, Germany — ⁴DESY, Germany — ⁵SLAC, Menlo Park, USA — ⁶CAU Kiel, Germany — ⁷University of Krakow, Poland — ⁸KIT, Karlsruhe, Germany

Using x-ray photoelectron diffraction (XPD) and angle-resolved photoemission spectroscopy, we study photoemission intensity associated with the changes in the geometric and electronic structure of the kagome metal CsV₃Sb₅ upon transition to an unconventional charge density wave (CDW) state. The XPD patterns reveal the presence of a chiral atomic structure in the CDW phase. Using circularly polarized x-rays, we have found a pronounced non-trivial circular dichroism in the angular distribution of the valence band photoemission in the CDW phase, indicating a chirality of the electronic structure. This observation is consistent with the proposed orbital loop current order. The results suggest an antiferromagnetic coupling of the orbital magnetic moments along the c-axis.

[1] H.J. Elmers et al., e-print on arXiv, 2408.03750 (2024).

Keywords: Kagome; CsV3Sb5; Chirality; CDW