Chiral superconductors exhibit novel transport properties that depend on the topology of the order parameter, topology of the Fermi surface, the spectrum of bulk and edge Fermionic excitations, and the structure of the impurity potential. In the case of electronic heat transport, impurities induce an anomalous (zero-field) thermal Hall conductivity that is easily orders of magnitude larger than the quantized edge contribution. The effect originates from branch-conversion scattering of Bogoliubov quasiparticles by the chiral order parameter, induced by potential scattering. The former transfers angular momentum between the condensate and the excitations that transport heat. The anomalous thermal Hall conductivity is shown to depend to the structure of the electron-impurity potential, as well as the winding number ν of the chiral order parameter . The results provide quantitative formulas for interpreting heat transport experiments seeking to identify broken T and P symmetries, as well as the topology of the order parameter for chiral superconductors.

Read More: Impurity-Induced Anomalous Thermal Hall Effect in Chiral Superconductors, Phys. Rev. Lett. 124, 157002 (2020)

Chiral Edge currents facilitate skew scattering in superconductors with Broken P and T symmetries

CAPST researchers Wave Ngampruetikorn and James Sauls published new theoretical predictions of a Zero-Field Thermal Hall Effect as a signature of a broken P and T ground state in Topological Superconductors

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