Kavli Affiliate: Ran Wang
| First 5 Authors: Ran Wang, Jiayang Li, Xinliang Huang, Lichuan Wang, Rui Song
| Summary:
In two-dimensional systems with Rashba spin-orbit coupling, it is well-known
that superconductivity can exhibit mixed spin-singlet and spin-triplet parity,
with the $boldsymbol{d}$-vector of spin-triplet pairing aligning parallel to
the $boldsymbol{g}$-vector of Rashba spin-orbit coupling. In this work, we
propose a model to describe a two-dimensional system with unconventional Rashba
bands and investigate its superconducting properties. We demonstrate that the
$boldsymbol{d}$-vector of spin-triplet pairing can be either parallel or
perpendicular to the $boldsymbol{g}$-vector of Rashba spin-orbit coupling,
depending on the nature of the pairing interaction. We also propose a junction
setup to identify the predominant pairing in such two similar pairing channels.
Additionally, our model predicts the emergence of a subleading spin-singlet
chiral $p$-wave topological superconducting state. Significantly, we find that
such unconventional Rashba bands and superconducting pairings can be realized
on the surface of certain superconducting topological materials, such as
trigonal layered PtBi$_{2}$.
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