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001     626184
005     20250715151507.0
024 7 _ |a 10.1103/PhysRevLett.134.096401
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100 1 _ |a Elmers, Hans-Joachim
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245 _ _ |a Chirality in the Kagome Metal CsV$_3$Sb$_5$
260 _ _ |a College Park, Md.
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500 _ _ |a restricted document, copyright restrictionsThis work was funded by theDeutsche Forschungsgemeinschaft (DFG, GermanResearch Foundation), Grant No. TRR288–422213477(Projects B03, B04, and B08), and Grant No. Scho341/16-1, through the Collaborative Research Center SFB 1170ToCoTronics (Project No. 258499086), through theWürzburg-Dresden Cluster of Excellence on Complexityand Topology in Quantum Matter ct.qmat (EXC 2147,Project No. 390858490), and by the BMBF (Projects05K22UM2, 05K22UM4, and 05K22WW1). Funding forthe instrument by the Federal Ministry of Education andResearch (BMBF) under framework program ErUM isgratefully acknowledged. We thank the Diamond LightSource for providing beamtime at beamline I09. Weacknowledge DESY (Hamburg, Germany) for the provisionof experimental facilities. Parts of this research were carriedout at PETRA III using beamlines P04 and P22. This workwas partially funded by the Helmholtz Association IVF fundunder project InterLabs-0002 “HELPFEL.
520 _ _ |a 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 CsV$_3$⁢Sb$_5$ 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. 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.
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773 _ _ |a 10.1103/PhysRevLett.134.096401
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