Odd-parity superconductivity in bilayer transition metal dichalcogenides
Abstract
Spin-orbit coupling in transition metal dichalcogenides (TMDCs) causes spin-valley locking giving rise to unconventional optical, transport, and superconducting properties. In this paper, we propose exotic superconductivity in bilayer group-IV TMDCs by symmetry control. The sublattice-dependent hidden spin-orbit coupling arising from local inversion symmetry breaking in the crystal structure may stabilize the odd-parity superconductivity by purely -wave local pairing interaction. The stability of the odd-parity superconducting state depends on the bilayer stacking. The 2H stacking in MoX and WX (X =S, Se) favors the odd-parity superconductivity due to interlayer quantum interference. On the other hand, the odd-parity superconductivity is suppressed by the 2H stacking of NbSe. Calculating the phase diagram of the tight-binding model derived from first principles band calculations, we conclude that the intercalated bilayer MoS and WS are candidates for a new class of odd-parity superconductors by spin-orbit coupling.
Keywords
Cite
@article{arxiv.1707.05964,
title = {Odd-parity superconductivity in bilayer transition metal dichalcogenides},
author = {Yasuharu Nakamura and Youichi Yanase},
journal= {arXiv preprint arXiv:1707.05964},
year = {2017}
}
Comments
To appear in Phys. Rev. B