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arXiv · 2305.18918

Proximity effect of time-reversal symmetry broken non-centrosymmetric superconductors

Tim Kokkeler·Alexander Golubov·Sebastián Bergeret·Yukio Tanaka
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Abstract

In non-centrosymmetric superconductors the pair potential has both even-parity singlet and odd-parity triplet components. If time-reversal symmetry is broken, the superconducting phase of these components is not the same, for example in anapole superconductors. In this paper it is shown that breaking time-reversal symmetry by a phase difference between the two components significantly alters both the density of states and the conductance in s+helical p-wave superconductors. The density of states and conductance in s+chiral p-wave superconductors are less influenced by adding a phase difference because time reversal symmetry is already broken in the s+p-wave superconductor. The Tanaka-Nazarov boundary conditions are extended to 3D superconductors, allowing to investigate a greater variety of superconductors, such as B-W superconductors, in which the direction of the d-vector is parallel to the direction of momentum. The results are important for the determination of pair potentials in potentially time-reversal symmetry broken non-centrosymmetric superconductors.

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Tim Kokkeler, Alexander Golubov, Sebastián Bergeret, Yukio Tanaka. 2023-05-30. Proximity effect of time-reversal symmetry broken non-centrosymmetric superconductors. https://doi.org/10.1103/physrevb.108.094503

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