Spin-orbit coupling and spin-triplet pairing symmetry in
arXiv:1911.01446 · doi:10.1103/PhysRevB.101.064507
Abstract
Spin-orbit coupling (SOC) plays a crucial role in determining the spin structure of an odd parity psedospin-triplet Cooper pairing state. Here, we present a thorough study of how SOC lifts the degeneracy among different p-wave pseudospin-triplet pairing states in a widely used microscopic model for , combining a Ginzburg-Landau (GL) free energy expansion, a symmetry analysis of the model, and numerical weak-coupling renormalization group (RG) and random phase approximation (RPA) calculations. These analyses are then used to critically re-examine previous numerical results on the stability of chiral p-wave pairing. The symmetry analysis can serve as a guide for future studies, especially numerical calculations, on the pairing instability in and can be useful for studying other multi-band spin-triplet superconductors where SOC plays an important role.
13 pages, 7 figures; a discussion on time reversal breaking and ultrasound experiments is added to the conclusion section; published version with other minor changes
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