Proximity-induced equilibrium supercurrent and perfect superconducting diode effect due to band asymmetry

Abstract

We theoretically investigate the consequences of proximity-induced conventional superconductivity in metals that break time-reversal and inversion symmetries through their energy dispersion. We discover behaviors impossible in an isolated superconductor such as an equilibrium supercurrent that apparently violates a no-go theorem and, at suitable topological defects, non-conservation of electric charge reminiscent of the chiral anomaly. The equilibrium supercurrent is expected to be trainable by a helical electromagnetic field in the normal state. Remarkably, if the band asymmetry exceeds the critical current of the parent superconductor in appropriate units, we predict a perfect superconducting diode effect with diode coefficient unity. We propose toroidal metals such as UNi${}_4$B and metals with directional scalar spin chiral order as potential platforms.

arXiv comment7+2 pages, 3 figures. Added result on perfect superconducting diode effect without fine-tuning

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Cited by in corpus (8)

• Field-free Josephson diode effect in altermagnet/normal metal/altermagnet junctions
• Intrinsic superconducting diode effects in tilted Weyl and Dirac semimetals
• Field-free Josephson diode effect in interacting chiral quantum dot junctions
• Josephson diode effect in junctions of superconductors with band asymmetric metals
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• Enhanced Superconducting Diode Effect in the Asymmetric Hatsugai-Kohmoto Model
• Universal route towards field-free electrically polarity-reversible Josephson diode
• Thermodynamic Constraints on Perfect Equilibrium Superconducting Diodes