Interplay between extended s-wave symmetry of the gap and spin-orbit coupling in the low electron concentration regime of quasi-two-dimensional superconductors

M. Zegrodnik; P. Wójcik

doi:10.1103/PhysRevB.106.184508

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Interplay between extended s-wave symmetry of the gap and spin-orbit coupling in the low electron concentration regime of quasi-two-dimensional superconductors

M. Zegrodnik, P. Wójcik

DOI 10.1103/PhysRevB.106.184508 · Physical Review B

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Abstract

We analyze the real-space paired state with the k-dependent superconducting gap in the presence of Rashba-type spin-orbit coupling and external magnetic field. We show that the extended s-wave pairing symmetry is the most probable scenario to appear in the low electron concentration regime. According to our study, the van Hove singularity induced by the spin-orbit coupling may lead to a significant enhancement of the superconducting gap, critical temperature, and critical magnetic field. Moreover, the combined effect of the spin-orbit coupling and the external magnetic field results in a nonzero total momentum of the Cooper pairs, which is a characteristic feature of the so-called helical state. In such a situation, due to the C4 symmetry breaking, a small d-wave and p-wave contributions to the pairing appear, which significantly change the character of the helical state. The obtained results are discussed in the context of the experimental data related with the unconventional superconducting features of the transition metal oxide interfaces as well as the recently reported supercurrent diode effect.