Thermal Hall conductivity of spin-triplet superconductor with time reversal symmetry breaking

International Conference on Strongly Correlated Electron Systems 2016

Imai, Yoshiki^1 ; Wakabayashi, Katsunori^2 ; Sigrist, Manfred^3

Department of Physics, Saitama University, Saitama

338-8570, Japan^1

Department of Nanotechnology for Sustainable Energy, Kwansei Gakuin University, Gakuen 2-1, Sanda, Hyogo

669-1337, Japan^2

Institut für Theoretische Physik, ETH-Zürich, Zürich

CH-8093, Switzerland^3

关键词: Excitation gaps;    Hall conductivity;    Lifshitz transition;    Pairing symmetries;    Quasi particles;    Spin triplet superconductors;    Superconducting phase;    Time reversal symmetries;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/10/102006/pdf
DOI  :  10.1088/1742-6596/807/10/102006

来源: IOP

【 摘 要 】

The thermal Hall conductivity is investigated for the superconductor Sr2RuO4assuming a time reversal symmetry breaking order parameter. The γ band of Sr2RuO4has its Fermi level near the van Hove points, close to the Lifshitz transition. Within a Bogoliubov-de Gennes approach we calculate the thermal Hall conductivity for pairing symmetries including two exemplary cases, the usual chiral p-wave phase and a fx2-y2-wave phase of the structure . In the chiral p-wave phase the thermal Hall conductivity consists of a universal temperature-linear term and an exponential correction due to quasiparticle activation with a full excitation gap. Due to line-nodes in the gap we find a correction which is quadratic in temperature for fx2-y2-wave state. This difference in the corrections allows to analyze the gap structure of the superconducting phase.