Chirality in the Kagome Metal CsV$_3$Sb$_5$

• DOI: 10.48550/arxiv.2408.03750
• Publication Date: 2024-08-07
• Authors: H. J. Elmers; Olena Tkach; Y. Lytvynenko; Priyanka Yogi; Matthias Schmitt; Deepnarayan Biswas; Junjun Liu; S. Chernov; Moritz Hoesch; Dmytro Kutnyakhov; Nils Wind; Lukas Wenthaus; Markus Scholz; Kai Roßnagel; A. Gloskovskii; C. Schlueter; Aimo Winkelmann; A. -A. Haghighirad; T.-L. Lee; Marc Lam Chok Sing; R. Claessen; M. Le Tacon; J. Demšar; G. Schönhense; O. Fedchenko
• Keywords: Chirality

Using x-ray photoelectron diffraction (XPD) and angle-resolved photoemission spectroscopy, we study intensity changes related to in the geometric electronic structure kagome metal CsV$_3$Sb$_5$ upon transition an unconventional charge density wave (CDW) state. The XPD patterns reveal presence of a chiral atomic CDW phase. Furthermore, using circularly polarized x-rays, have found pronounced non-trivial circular dichroism angular distribution valence band phase, indicating chirality structure. This observation is consistent with proposed orbital loop current order. In view negligible spontaneous Kerr signal recent magneto-optical studies, results suggest antiferromagnetic coupling magnetic moments along $c$-axis. While inherent structural may also induce dichroism, observed asymmetry values seem be too large case weak distortions caused by CDW.