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Nonreciprocal superconductivity
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We introduce the notion of nonreciprocal superconductors where inversion and time-reversal symmetries are broken, giving rise to an asymmetric energy dispersion. We demonstrate that nonreciprocal superconductivity can be detected by Andreev reflection. In particular, a transparent junction between a normal metal and a nonreciprocal superconductor generally exhibits an asymmetric current-voltage characteristic, which serves as a defining feature of nonreciprocal superconductivity. Unlike the superconducting diode effects, our detection scheme has the advantage of avoiding large critical currents that turn the superconducting state to normal. Finally, we discuss candidates for nonreciprocal superconductivity, including graphene, UTe2, as well as engineered platforms.
Forward citations
Cited by 2 Pith papers
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Probing Cooper pair momentum by quasiparticle steering with planar Josephson junctions
Quasiparticles eject from ballistic planar Josephson junctions at a phase-controlled angle scaling as √(Δ/μ), providing a kinematic probe of condensate momentum transfer.
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Superconducting diode efficiency from singlet-triplet mixing in disordered systems
Disorder scattering can reverse the sign of the superconducting diode efficiency at weak Rashba coupling and can induce a finite diode effect at strong Rashba coupling through singlet-triplet mixing.
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