Universal Spin Superconducting Diode Effect from Spin-Orbit Coupling
Yue Mao, Qing Yan, Yu-Chen Zhuang, Qing-Feng Sun
DOI 10.1103/PhysRevLett.132.216001 · Physical Review Letters
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Abstract
We propose a universal spin superconducting diode effect (SDE) induced by spin-orbit coupling (SOC) in systems with spin-triplet correlations, where the critical spin supercurrents in opposite directions are unequal. By analysis from both the Ginzburg-Landau theory and energy band analysis, we show that the spin-↑↑ and spin-↓↓ Cooper pairs possess opposite phase gradients and opposite momenta from the SOC, which leads to the spin SDE. Two superconductors with SOC, a p-wave superconductor as a toy model and a practical superconducting nanowire, are numerically studied and they both exhibit spin SDE. In addition, our theory also provides a unified picture for both spin and charge SDEs.
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