Direct and inverse superspin Hall effect in two-dimensional systems: Electrical detection of spin supercurrents

Abstract

A useful experimental signature of the ordinary spin Hall effect is the spin accumulation it produces at the sample edges. The superspin Hall current [Phys. Rev. B 96, 094512 (2017)] is a transverse equilibrium spin current which is induced by a charge supercurrent. We study the superspin Hall current numerically, and find that it does not give rise to a similar edge magnetization. We also predict and numerically confirm the existence of the inverse superspin Hall effect, which produces a transverse charge supercurrent in response to an equilibrium spin current. We verify the existence of the inverse superspin Hall effect both for a spin-polarized charge supercurrent and an exchange spin current, and propose that a ${\varphi }_0$ junction produced by the inverse superspin Hall effect can be used to directly and electrically measure the spin polarization of a charge supercurrent. This provides a possible way to solve the long-standing problem of how to directly detect the spin-polarization of supercurrents carried by triplet Cooper pairs.

arXiv comment12 pages, 12 figures

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Cited by in corpus (8)

• Microscopic study of the Josephson supercurrent diode effect in Josephson junctions based on two-dimensional electron gas
• Boosting spintronics with superconductivity
• Spin supercurrent in two-dimensional superconductors with Rashba spin-orbit interaction
• Anomalous Josephson Hall effect charge and transverse spin currents in superconductor/ferromagnetic insulator/superconductor junctions
• Controlling spin supercurrents via nonequilibrium spin injection
• Planar Josephson Hall effect in topological Josephson junctions
• Quantum-geometric spin and charge Josephson diode effects
• Bending-strain effects in conventional superconductors and superconducting junctions