Theory of Higgs modes in d-wave superconductors

Article

关键词: QUASI-PARTICLES;    NORMAL-STATE;    PSEUDOGAP;    DENSITY;    GAP;   

DOI  :  10.1103/PhysRevB.102.014511

来源: SCIE

【 摘 要 】

By applying a microscopic gauge-invariant kinetic theory in d-wave superconductors, we analytically derive the energy spectra of the breathing Higgs mode and, in particular, rotating Higgs mode that is unique for the d-wave order parameter. An analytical investigation on their dynamic properties is also revealed. We show that the breathing Higgs mode is optically visible in the second-order regime. Whereas the rotating Higgs mode is optically inactive, we show that this mode can be detected in the pseudogap phase by a magnetic resonance experiment. It is interesting to find that with a longitudinal temperature gradient, the charge-neutral rotating Higgs mode generates a thermal Hall current by a magnetic field in the pseudogap phase, providing a unique scheme for its detection. This finding is likely to capture a very recent experimental observation of negative thermal Hall signal in cuprate superconductors [G. Grissonnanche et al., Nature (London) 571, 376 (2019)] for the overdoped pseudogap phase.

【 授权许可】

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