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arxiv: 2208.08036 · v2 · pith:V2U3O5ZLnew · submitted 2022-08-17 · ❄️ cond-mat.str-el

Time-reversal symmetry breaking in charge density wave of CsV₃Sb₅ detected by polar Kerr effect

Yajian Hu , Soichiro Yamane , Giordano Mattoni , Kanae Yada , Keito Obata , Yongkai Li , Yugui Yao , Zhiwei Wang
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Jingyuan Wang Camron Farhang Jing Xia Yoshiteru Maeno Shingo Yonezawa
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classification ❄️ cond-mat.str-el
keywords fieldkerrkagomeanglebandchargecouplingcurrent
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The Kagome lattice exhibits rich quantum phenomena owing to its unique geometric properties. Appealing realizations are the Kagome metals AV$_3$Sb$_5$ (A = K, Rb, Cs), where unconventional charge density wave (CDW) is intertwined with superconductivity and non-trivial band topology. Several experiments suggest that this CDW is a rare occurrence of chiral CDW characterized by orbital loop current. However, key evidences of loop current, spontaneous time-reversal symmetry-breaking (TRSB) and the coupling of its order parameter with the magnetic field remain elusive. Here, we investigate the CDW in CsV3Sb5 by magneto-optic polar Kerr effect with sub-microradian resolution. Under magnetic field, we observed a jump of the Kerr angle at the CDW transition. This jump is magnetic-field switchable and scales with field, indicating magneto--chirality coupling related to non-trivial band topology. At zero field, we found non-zero and field-trainable Kerr angle below CDW transition temperature, signaling spontaneous TRSB. Our results provide a crucial step to unveil quantum phenomena in correlated Kagome materials.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Microscopic evidence for imaginary charge density wave in a kagome metal

    cond-mat.str-el 2026-05 conditional novelty 7.0

    NQR spectra at the out-of-plane Sb site in CsV3Sb5 reveal magnetic broadening and asymmetric lineshapes below the nematic transition consistent with ~1 mT local fields from chiral loop currents.

  2. Visualizing the interplay of dual electronic nematicities in kagome superconductors

    cond-mat.supr-con 2026-04 unverdicted novelty 7.0

    Two distinct nematic orders coexist in CsV3Sb5 with different directors at intermediate doping, one CDW-linked and one orbital-based, persisting to high temperatures and doping where CDW vanishes.

  3. Nonreciprocal superconducting critical currents with normal state field trainability in kagome superconductor CsV3Sb5

    cond-mat.supr-con 2025-06 unverdicted novelty 7.0

    Nonreciprocal zero-field critical currents in CsV3Sb5 nanodevices whose polarity is trainable by magnetic fields applied above the CDW transition, evidencing TRS-breaking loop-current CDW order.

  4. NMR evidence for a loop-current state with broken $C_6$ symmetry in the charge-ordered CsV$_3$Sb$_5$

    cond-mat.supr-con 2026-06 unverdicted novelty 6.0

    NMR measurements provide evidence for a static loop-current state breaking C6 symmetry in the CDW phase of CsV3Sb5, with an internal magnetic field of 3.6 Oe at V sites and orbital moments of 0.002-0.01 μB.

  5. Origin of switchable quasiparticle-interference chirality in loop-current phase of kagome metals measured by scanning-tunneling-microscopy

    cond-mat.str-el 2025-03 unverdicted novelty 6.0

    Theoretical modeling finds that dilute impurities in the loop-current phase of kagome metals generate switchable chiral QPI signals whose chirality tracks the Z3 nematicity set by loop-current order relative to the st...