Strong intrinsic or interfacial spin-orbit coupling (SOC) can enable a thin-film superconductor to exceed the paramagnetic limit. For Rashba-type SOC, we show that the superconducting thermodynamic properties of a finite-size thin film are strongly sample-size dependent due to the creation of edge states; for example, in the case of geometrically anisotropic thin films, the critical field is found to be tunable through the direction of an externally applied in-plane magnetic field. These findings open perspectives for the development of superconducting spin-orbitronic devices.
Physical Review B: Condensed Matter and Materials Physics
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Olde Olthof, L.A.B, Weggemans, J.R, Kimbell, G, Robinson, J.W.A, & Montiel, X. (2021). Tunable critical field in Rashba superconductor thin films. Physical Review B: Condensed Matter and Materials Physics, 103(2). doi:10.1103/PhysRevB.103.L020504