Topological properties of spin-triplet superconductors and the Fermi surface topology in the normal state

Research paper by Masatoshi Sato

Indexed on: 26 Jun '09Published on: 26 Jun '09Published in: Physics - Superconductivity


We report intimate relations between topological properties of full gapped spin-triplet superconductors with time-reversal invariance and the Fermi surface topology in the normal states. An efficient method to calculate the Z2 invariants and the winding number for the spin-triplet superconductors is developed, and connections between these topological invariants and the Fermi surface structures in the normal states are pointed out. We also obtain a correspondence between the Fermi surface topology and gapless surface states in the superconducting states. The correspondence is inherent to spin-triplet superconductivity.