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15.12.23: Talk by Jin-Tao Jin "Multiple-Q Pair Density Wave in Proximity to a Nested Fermi Surface"
Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences
15.12.2023 at 09:00
We show that spontaneous time-reversal-symmetry (TRS) breaking can naturally arise from the interplay between pair density wave (PDW) ordering at multiple momenta and nesting of Fermi surfaces (FS). Concretely, we consider the PDW superconductivity on a hexagonal lattice with nested FS, which is related to a recently discovered superconductor CsV3Sb5. Commencing with a phenomenological mean-field Hamiltonian, the calculation of condensation energy shows that the interference among these PDW condensates gives rise to a spontaneous TRS breaking superconducting state, with stable Bogoliubov FS. Subsequently, we compute various spectra for such a TRS breaking state, including (local) density of states, the effect of quasi-particle interference and electron spectral function. Possible implications to real materials such as CsV3Sb5 and future experiments have been further discussed. Ref: J.-T. Jin, K. Jiang, H. Yao, and Y. Zhou, PRL 129, 167001 (2022)
Room A 450