Chirality in the Kagome Metal CsV3Sb5

被引：5

作者：

Elmers, H. J. ^{[1
]}

Tkach, O. ^{[1
,2
]}

Lytvynenko, Y. ^{[1
,3
,4
]}

Yogi, P. ^{[1
]}

Schmitt, M. ^{[5
,6
,7
]}

Biswas, D. ^{[5
]}

Liu, J. ^{[5
]}

Chernov, S., V ^{[8
]}

Nguyen, Quynh ^{[9
]}

Hoesch, M. ^{[8
]}

Kutnyakhov, D. ^{[8
]}

Wind, N. ^{[8
,10
]}

Wenthaus, L. ^{[8
]}

Scholz, M. ^{[8
]}

Rossnagel, K. ^{[10
,11
]}

Gloskovskii, A. ^{[8
]}

Schlueter, C. ^{[8
]}

Winkelmann, A. ^{[12
]}

Haghighirad, A. -a.

Lee, T. -l.

Sing, M. ^{[6
,7
]}

Claessen, R. ^{[6
,7
]}

Le Tacon, M. ^{[13
]}

Demsar, J. ^{[1
]}

Schoenhense, G. ^{[1
]}

Fedchenko, O. ^{[1
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Phys, Staudingerweg 7, D-55128 Mainz, Germany

[2] Sumy State Univ, Kharkivska 116, UA-40007 Sumy, Ukraine

[3] NAS, Inst Magnetism, UA-03142 Kyiv, Ukraine

[4] MES Ukraine, UA-03142 Kyiv, Ukraine

[5] Diamond Light Source Ltd, Didcot OX11 0DE, England

[6] Julius Maximilians Univ, Phys Inst, D-97074 Wurzburg, Germany

[7] Julius Maximilians Univ, Wurzburg Dresden Cluster Excellence Ct Qmat, D-97074 Wurzburg, Germany

[8] Deutsch Elektronen Synchrotron DESY, D-22607 Hamburg, Germany

[9] SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA

[10] Christian Albrechts Univ Kiel, Inst Expt & Angew Phys, D-24098 Kiel, Germany

[11] Deutsch Elektronen Synchrotron DESY, Ruprecht Haensel Lab, D-22607 Hamburg, Germany

[12] AGH Univ Krakow, Acad Ctr Mat & Nanotechnol, PL-30059 Krakow, Poland

[13] Karlsruhe Inst Technol, Inst Quantum Mat & Technol, D-76021 Karlsruhe, Germany

来源：

PHYSICAL REVIEW LETTERS | 2025年 / 134卷 / 09期

关键词：

CHARGE-DENSITY-WAVE; CIRCULAR-DICHROISM; TRANSITION; STATE; PHASE; ORDER;

D O I：

10.1103/PhysRevLett.134.096401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 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. 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.

引用

页数：7

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