Spontaneous thermal Hall conductance in superconductors with broken time-reversal symmetry

Yılmaz, Fırat; Yip, Sungkit

doi:10.1103/physrevresearch.2.023223

Cited by 4 publications

(1 citation statement)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is responsible for the anomalous thermal Hall effect and the fluctuation-driven Nernst effect [1, 25,26]. The mechanisms of the anomalous thermal Hall effect are classified into (i) intrinsic, which arises from the Berry curvature, and (ii) extrinsic, via asymmetric impurity scattering [56][57][58][59][60][61]. In chiral superconductors, the fluctuation-driven Nernst effect stems from skew scattering via preformed chiral Cooper pairs, qualitatively different from the conventional fluctuation-induced Nernst effect in superconductors [62].…”

mentioning

confidence: 99%

Anomalous acoustoelectric effect induced by clapping modes in chiral superconductors

Matsushita,

Mizushima,

Vekhter

et al. 2021

Preprint

View full text Add to dashboard Cite

Clapping modes, which are relative amplitude and phase modes between two chiral components of Cooper pairs, are bosonic collective modes inherent to chiral superconductors. These modes behave as long-lived bosons with masses smaller than the threshold energy, 2|∆|, for decay into unbound fermion pairs. Here, we clarify that the real/imaginary clapping modes in chiral superconductors directly couple to acoustic wave propagation when the weak particle-hole asymmetry of the normal state quasiparticle dispersion is taken into account. The clapping modes driven by an acoustic wave generate an alternating electric current, that is, the acoustoelectric effect in superconductors. Significantly, the clapping modes give rise to a transverse electric current. When the sound velocity is comparable to the Fermi velocity, as in heavy fermion compounds, the transverse current is resonantly enhanced at energy below the threshold for continuum excitations. This resonance provides a smoking-gun evidence of chiral superconductivity. I. INTRODUCTIONElectric Current Acoustic wave propagation Clapping mode Acoustic wave Chiral Cooper pair Amplitude mode phase mode Clapping mode FIG. 1. Schematic image of the AAEE in chiral superconductors: Clapping excitations of chiral Cooper pairs are driven by propagating acoustic waves, leading to transverse electric current.

show abstract