Yuki Nagai, Hiroki Nakamura, Masahiko Machida
In a promising candidate of topological superconductors, CuxBi2Se3, we propose a way to exclusively determine the pairing symmetry. The proposal suggests measuring the angle dependence of the thermal conductivity in the basal $ab$-plane below the superconducting transition temperature (Tc), since it shows a distinct strong anisotropy only when the pairing symmetry is an odd-parity spin-polarized triplet. Such striking isotropy breaking below Tc is explicitly involved in Dirac formalism for superconductors, in which the spin-orbit coupling is essential. We classify possible gap functions based on the Dirac formalism and clarify an origin of the isotropy breaking.
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http://arxiv.org/abs/1206.0563
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