Rotational Isotropy Breaking as Proof for Spin-polarized Cooper Pairs in the Topological Superconductor CuxBi2Se3

Abstract

In a promising candidate of topological superconductors, CuxBi2Se3, we propose a way to exclusively determine the pairing symmetry. The proposal suggests that the angle dependence of the thermal conductivity in the basal ab-plane shows a distinct strong anisotropy only when the pairing symmetry is an odd-parity spin-polarized triplet below the superconducting transition temperature (Tc). 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.

6 pages, 3 figures, Accepted in Phys. Rev. B

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• Majorana Fermions and Topology in Superconductors
• Thermodynamic evidence for nematic superconductivity in Cu${}_x$Bi${}_2$Se${}_3$
• Topologically protected surface states in a centrosymmetric superconductor beta-PdBi2
• Nematic superconductivity in doped Bi2Se3 topological superconductors
• Identification of nematic superconductivity from the upper critical field
• Superconductivity in doped Dirac semimetals
• Bulk electronic state of superconducting topological insulator
• Topological phase transitions in multi-component superconductors
• High-pressure study of the basal-plane anisotropy of the upper critical field of the topological superconductor SrxBi2Se3
• Nanocalorimetric Evidence for Nematic Superconductivity in the Doped Topological Insulator Sr${}_{0.1}$Bi${}_2$Se${}_3$
• Surface electronic state of superconducting topological crystalline insulator
• Non-fragile superconductivity with nodes in the superconducting topological insulator CuxBi2Se3: Zeeman orbital field and non-magnetic impurities
• Spin-polarized Majorana Bound States inside a Vortex Core in Topological Superconductors
• Non-magnetic impurity effects in a three-dimensional topological superconductor: From p- to s-wave behaviors
• Odd-parity superconductivity near inversion breaking quantum critical point in one dimension
• Time-reversal invariant and fully gapped unconventional superconducting state in the bulk of the topological Nb0.25Bi2Se3
• Novel anisotropic spin singlet pairings in Cu${}_x$Bi${}_2$Se${}_3$ and Bi${}_2$Te${}_3$
• Quasiclassical Treatment and Odd-parity/Triplet Correspondence in Topological Superconductors
• Muon spin rotation study of the topological superconductor SrxBi2Se3
• Field-angle-dependent low-energy excitations around a vortex in the superconducting topological insulator CuxBi2Se3
• Signatures of Electronic Nematicity in (111) LaAlO${}_3$/SrTiO${}_3$ Interfaces
• Nuclear magnetic relaxation rates of unconventional superconductivity in doped topological insulators
• Superconducting and normal-state anisotropy of the doped topological insulator Sr${}_{0.1}$Bi${}_2$Se${}_3$
• Surface states around a vortex in topological superconductors: Intersection of a surface and a vortex