Symmetry conditions for the superconducting diode effect in chiral superconductors

Abstract

We analyze the presence of non-reciprocal critical currents, the so-called superconducting diode effect, in chiral superconductors within a generalized Ginzburg-Landau framework. After deriving its key symmetry conditions we illustrate the basic mechanism for two examples, the critical current in a thin film and a Josephson junction. The appearance of spontaneous edge currents and the energy bias for the formation of Josephson vortices play an essential part in establishing a splitting of the critical currents running in opposite directions. Eventually, this allows us to interpret a superconducting diode effect observed in the 3-Kelvin phase of Sr${}_2$RuO${}_4$ as evidence for spontaneously broken time-reversal symmetry in the superconducting phase.

References in corpus (8)

• High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State
• Intrinsic Superconducting Diode Effect
• Supercurrent diode effect and finite momentum superconductivity
• A phenomenological theory of superconductor diodes
• Observation of broken time-reversal symmetry in the heavy fermion superconductor UPt${}_3$
• Theory of the supercurrent diode effect in Rashba superconductors with arbitrary disorder
• Evidence for broken time-reversal symmetry in the superconducting phase of URu${}_2$Si${}_2$
• Unsplit superconducting and time reversal symmetry breaking transitions in Sr${}_2$RuO${}_4$ under hydrostatic pressure and disorder

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