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Supercurrent diode effect and finite-momentum superconductors
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Journal Article
Supercurrent diode effect and finite-momentum superconductors
2022
Overview
When both inversion and time-reversal symmetries are broken, the critical current of a superconductor can be nonreciprocal. In this work, we show that, in certain classes of two-dimensional superconductors with antisymmetric spin–orbit coupling, Cooper pairs acquire a finite momentum upon the application of an in-plane magnetic field, and, as a result, critical currents in the direction parallel and antiparallel to the Cooper pair momentum become unequal. This supercurrent diode effect is also manifested in the polarity dependence of in-plane critical fields induced by a supercurrent. These nonreciprocal effects may be found in polar SrTiO₃ film, few-layer MoTe₂ in the Td
phase, and twisted bilayer graphene in which the valley degree of freedom plays a role analogous to spin.
Publisher
National Academy of Sciences
