Exotic Pairing Nature and Charge Ordering in Kagome Superconductor

Seminar iTHEMS Theoretical Physics Seminar
Date
June 5 (Thu) 15:00 - 16:15, 2025 (JST)
Speaker
  • Wu Xianxin (Associate Professor, CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China)
Venue
Language
English
Host
Ching-Kai Chiu and Congcong Le

Abstract：Recent experimental investigations have identified fascinating electronic orders in kagome metals, such as intriguing superconductivity, charge density wave (CDW) and nematicity. Notably, there is various evidence of spontaneous time-reversal symmetry (TRS) breaking within the CDW phase, pointing to a long-pursued loop current order, though its underlying mechanism remains elusive. In this talk, I will first review the exotic properties of these kagome superconductors. Then, I will discuss the effective model and the unique sublattice texture associated with van Hove singularities in the kagome lattice [1], which turns out to have significant effect on correlated states. Finally, I will present our scenario for realizing a TRS breaking CDW within the kagome lattice and discuss loop-current fluctuation induced unconventional pairing [2-4]. Potential experimental implications will be also discussed.

References

  1. X. Wu et al., Nature of Unconventional Pairing in the Kagome Superconductors AV3Sb5(A=K,Rb,Cs), Phys. Rev. Lett. 127, 177001 (2021), doi: 10.1103/PhysRevLett.127.177001
  2. R. Fu, X. Wu et al., Exotic charge density waves and superconductivity on the Kagome Lattice, arXiv:2405.09451 (2024), arXiv: https://doi.org/10.48550/arXi
  3. Y. Lin, J. Dong, R. Fu, X. Wu, Z. Wang, S. Zhou et al., Interplay of Charge Density Wave and Magnetism on the Kagome Lattice, arXiv: 2409.03063 (2024), arXiv: https://doi.org/10.48550/arXi
  4. Q. Li, G. Pan, X. Zhang, S. Nakatsuji, W. Jiang, X. Xu and X. Wu,, Loop-Current Fluctuations Mediated Chiral 𝑑-Wave Pairing in Kagome Lattice, Chin. Phys. Lett. 42, 057302 (2025), doi: 10.1088/0256-307X/42/5/057302

Related News