3 years ago

Topological superconductor in quasi-one-dimensional Tl2-xMo6Se6.

Chi-Cheng Lee, Hsin Lin, Shiue-Yuan Shiau, Chuang-Han Hsu, Arun Bansil, Su-Yang Xu, Shin-Ming Huang

We propose that the quasi-one-dimensional molybdenum selenide compound Tl2-xMo6Se6 is a time-reversal-invariant topological superconductor induced by inter-sublattice pairing, even in the absence of spin-orbit coupling (SOC). No noticeable change in superconductivity is observed in Tl-deficient (0<=x<=0.1) compounds. At weak SOC, the superconductor prefers the triplet d vector lying perpendicular to the chain direction and two-dimensional E2u symmetry, which is driven to a nematic order by spontaneous rotation symmetry breaking. The locking energy of the d vector is estimated to be weak and hence the proof of its direction would rely on tunnelling or phase-sensitive measurements.

Publisher URL: http://arxiv.org/abs/1711.00815

DOI: arXiv:1711.00815v1

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