Kramers Fulde-Ferrell state and superconducting spin diode effect

Abstract

We study a novel Fulde-Ferrell equal-spin pairing state with opposite center of mass Cooper pair momentum for each spin polarization. This state respects time-reversal symmetry and is dubbed a Kramers Fulde-Ferrell (KFF) state. It can be realized in a one-dimensional system with spin-orbit coupling and nearest neighbor attraction. We find that the KFF state supports nonreciprocal spin transport for both bulk superconductor and Josephson junctions when inversion symmetry is broken. In addition to the spin Josephson diode effect, the charge transport is controlled by intriguing dynamics of bound states whose transitions can be manipulated by the length of the KFF superconductor. We discuss the relevance of the effective theory to the novel physics observed in monolayer Fe-based superconductor along line defects and domain walls, and the potential for using spins to make dissipationless superconducting spintronics.

13 pages, 6 figures

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Cited by in corpus (6)

• Discovery of a pair density wave state in a monolayer high-Tc iron-based superconductor
• Universal spin superconducting diode effect from spin-orbit coupling
• Time reversal symmetry breaking and zero magnetic field Josephson diode effect in Dirac semimetal Cd3As2-mediated asymmetric SQUIDs
• Orbital effect on intrinsic superconducting diode effect
• Josephson diodes induced by the loop current states
• Spin-triplet pair density wave superconductors