Topological Features in a Chiral p-wave Superconductor under Uniaxial Strain

Uniaxial strain effects in the superconducting phase are investigated assuming chiral p-wave pairing for the unconventional superconductor Sr2RuO4. The Fermi surface structure of the.-band is especially sensitive to this type of strain as it is presumably most important for the superconducting phase and its Fermi surface undergoes a Lifshitz transition. Taking several distinct pairing channels within a lattice model into account, we study the effect of strain on the topological properties of the superconducting phase considering various characteristic quantities such as the thermal Hall conductivity, which gives direct access to the Chern number of the pairing state in the low-temperature limit. While the charge edge current under strain depends on the dominant pairing channel but is essentially insensitive to the Fermi surface topology, we find that the temperature dependence of the thermal Hall conductivity is strongly affected by the Lifshitz transition under strain.