Chirality in the Kagome Metal CsV3⁢Sb5

Elmers, H. J.; Tkach, O.; Lytvynenko, Y.; Yogi, P.; Schmitt, M.; Biswas, D.; Liu, J.; Chernov, S. V.; Nguyen, Quynh; Hoesch, M.; Kutnyakhov, D.; Wind, N.; Wenthaus, L.; Scholz, M.; Rossnagel, K.; Gloskovskii, A.; Schlueter, C.; Winkelmann, A.; Haghighirad, A. -A.; Lee, T.-L.; Sing, M.; Claessen, R.; Le Tacon, M.; Demsar, J.; Schönhense, G.; Fedchenko, O.

doi:10.1103/physrevlett.134.096401

Chirality in the Kagome Metal CsV₃⁢Sb₅

Journal Article · Thu Mar 06 00:00:00 EST 2025 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.134.096401· OSTI ID:2575496

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Johannes Gutenberg-Universität, Mainz (Germany)
Johannes Gutenberg-Universität, Mainz (Germany); Sumy State University (Ukraine)
Johannes Gutenberg-Universität, Mainz (Germany); Institute of Magnetism, Kyiv (Ukraine)
Diamond Light Source Ltd., Didcot (United Kingdom); Julius-Maximilians-Universität, Wurzburg (Germany)
Diamond Light Source Ltd., Didcot (United Kingdom)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Christian-Albrechts-Universität zu Kiel (Germany)
Christian-Albrechts-Universität zu Kiel (Germany); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
AGH University of Krakow (Poland)
Karlsruhe Institute of Technology (Germany)
Julius-Maximilians-Universität, Wurzburg (Germany)

Using x-ray photoelectron diffraction (XPD) and angle-resolved photoemission spectroscopy, we study photoemission intensity changes related to changes in the geometric and electronic structure in the kagome metal CsV₃⁢Sb₅ 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. Furthermore, using circularly polarized x-rays, we have found a pronounced nontrivial 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. In view of a negligible spontaneous Kerr signal in recent magneto-optical studies, the results suggest an antiferromagnetic coupling of the orbital magnetic moments along the 𝑐 axis. Here, while the inherent structural chirality may also induce circular dichroism, the observed asymmetry values seem to be too large in the case of the weak structural distortions caused by the CDW.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: Deutsche Forschungsgemeinschaft (DFG, German Research Foundation); USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2575496

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 134; ISSN 1079-7114; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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