Helical Topological Superconducting Pairing at Finite Excitation Energies

Abstract

We propose helical topological superconductivity away from the Fermi surface in three-dimensional time-reversal-symmetric odd-parity multiband superconductors. In these systems, pairing between electrons originating from different bands is responsible for the corresponding topological phase transition. Consequently, a pair of helical topological Dirac surface states emerges at finite excitation energies. These helical Dirac surface states are tunable in energy by chemical potential and strength of band-splitting. They are protected by time-reversal symmetry combined with crystalline two-fold rotation symmetry. We suggest concrete materials in which this phenomenon could be observed.

arXiv comment7 + 16 pages, 8 figures, and 3 tables

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Cited by in corpus (3)

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• Specular-Andreev reflection and Andreev interference in an Ising superconductor junction