Rectification and nonlinear Hall effect by fluctuating finite-momentum Cooper pairs

Abstract

Nonreciprocal charge transport is attracting much attention as a novel probe and functionality of noncentrosymmetric superconductors. In this work, we show that both the longitudinal and transverse nonlinear paraconductivity are hugely enhanced in helical superconductors in moderate and high magnetic fields, which can be observed by second-harmonic resistance measurements. The discussion is based on the generalized formulation of nonlinear paraconductivity in combination with the microscopically determined Ginzburg-Landau coefficients. The enhanced nonreciprocal transport would be observable even with the cyclotron motion of fluctuating Cooper pairs, which is elucidated with a Kubo-type formula of nonlinear paraconductivity. Nonreciprocal charge transport in the fluctuation regime is thereby established as a promising probe of helical superconductivity regardless of the sample dimensionality. Implications on the other finite-momentum superconducting states are briefly discussed.

arXiv comment5 pages, 5 figures (+16 pages, 15 figures)

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• Nonlinear optical responses in superconductors under magnetic fields: quantum geometry and topological superconductivity
• Nonlinear diode effect and Berezinskii-Kosterlitz-Thouless transition in purely two-dimensional noncentrosymmetric superconductors
• Reciprocal and nonreciprocal paraconductivity in bilayer multiphase superconductors
• Electrical magnetochiral anisotropy in Rashba superconductors
• Supercurrent-induced antiferromagnetic order and spin-triplet pair generation in quantum critical d-wave superconductors
• Ratchet Hall Effect in Fluctuating Superconductors
• Transverse superconducting diode without parity and time-reversal violation