Supercurrent diode effect in helical superconductors

Jaglul Hasan; Daniel Shaffer; Maxim Khodas; Alex Levchenko

doi:10.1103/PhysRevB.110.024508

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Supercurrent diode effect in helical superconductors

Jaglul Hasan, Daniel Shaffer, Maxim Khodas, Alex Levchenko

DOI 10.1103/PhysRevB.110.024508 · Physical Review B

T1

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Abstract

In this work, we explore the generalities of the supercurrent diode effect. As an illustrative example, we examine a model of a two-dimensional superconductor with Rashba-type spin-orbit coupling under an in-plane magnetic field and in the clean limit, which realizes a helical phase. First, we utilize Ginzburg-Landau phenomenology to derive a general formula for the diode efficiency. This is achieved by incorporating higher gradient terms in the Lifshitz invariants, which are responsible for the nonreciprocal superflow. Subsequently, we validate these results through microscopic diagrammatic computation and further estimate correction terms arising from interband pairing correlations. We provide a detailed comparison to prior investigations of this problem conducted within the framework of the quasiclassical approximation based on the Eilenberger equation.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
MoS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown