Dissipation-enhanced non-reciprocal superconductivity: application to multi-valley superconductors
Abstract
We here propose and study theoretically a non-equilibrium mechanism for the superconducting diode effect, which applies specifically to the case where time-reversal-symmetry -- a prerequisite for the diode effect -- is spontaneously broken by the superconducting electrons themselves. We employ a generalized time-dependent Ginzburg-Landau formalism to capture dissipation effects in the non-equilibrium current-carrying state via phase slips and show that the coupling of the resistive current to the symmetry-breaking order is enough to induce a diode effect. Depending on parameters, the critical current asymmetry can be sizeable, asymptotically reaching a perfect diode efficiency; the competition of symmetry-breaking order, superconducting and resistive currents gives rise to rich physics, such as current-stabilized, non-equilibrium superconducting correlations. Although our mechanism is more general, the findings are particularly relevant to twisted trilayer and rhombohedral tetralayer graphene, where the symmetry-breaking order parameter refers to the imbalance of the two valleys of the systems.
Cite
@article{arxiv.2501.01501,
title = {Dissipation-enhanced non-reciprocal superconductivity: application to multi-valley superconductors},
author = {Sayan Banerjee and Mathias S. Scheurer},
journal= {arXiv preprint arXiv:2501.01501},
year = {2025}
}