Spin supercurrent in two-dimensional superconductors with Rashba spin-orbit interaction

Abstract

Spin current is a central theme in spintronics, and its generation is a keen issue. The spin-polarized current injection from the ferromagnet, spin battery, and spin Hall effect have been used to generate spin current, but Ohmic currents in the normal state are involved in all of these methods. On the other hand, the spin and spin current manipulation by the supercurrent in superconductors is a promising route for dissipationless spintronics. Here we show theoretically that, in two-dimensional superconductors with Rashba spin-orbit interaction, the generation of dissipationless bulk spin current by charge supercurrent becomes highly efficient, exceeding that in normal states in the dilute limit, i.e. when the chemical potential is close to the band edge, although the spin density becomes small there. This result manifests the possibility of creating new spintronic devices with long-range coherence.

arXiv commentPublication version (with Supplementary). To appear in Communications Physics

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• On-demand thermoelectric generation of equal-spin Cooper pairs
• Nonlinear Superconducting Magnetoelectric Effect
• Quantum geometry encoded to pair potentials
• Giant surface Edelstein effect in $d$-wave superconductors
• Direct observation of quantum anomalous vortex in Fe(Se,Te)
• Spin supercurrent in superconductor/ferromagnet van-der-Waals heterostructures
• Phase biasing of a Josephson junction using Rashba-Edelstein effect
• Spin and orbital Edelstein effect in spin-orbit coupled noncentrosymmetric superconductor
• Proximity effect and p-wave superconductivity in s-wave superconductor/helimagnet heterostructures
• Chirality-dependent spin polarization in metals: linear and quadratic responses
• Inducing ${\mathbb{Z}}_2$ Topology in Twisted Nodal Superconductors
• Growth optimization of TaN for superconducting spintronics