Unconventional pairing in Ising superconductors: Application to monolayer NbSe_2
arxiv(2024)
摘要
The presence of a non-centrosymmetric crystal structure and in-plane mirror
symmetry allows an Ising spin-orbit coupling to form in some two-dimensional
materials. Examples include transition metal dichalcogenide superconductors
like monolayer NbSe_2, MoS_2, TaS_2, and PbTe_2, where a nontrivial
nature of the superconducting state is currently being explored. In this study,
we develop a microscopic formalism for Ising superconductors that captures the
superconducting instability arising from a momentum-dependent spin- and
charge-fluctuation-mediated pairing interaction. We apply our pairing model to
the electronic structure of monolayer NbSe_2, where first-principles
calculations reveal the presence of strong paramagnetic fluctuations. Our
calculations provide a quantitative measure of the mixing between the even- and
odd-parity superconducting states and its variation with Coulomb interaction.
Further, numerical analysis in the presence of an external Zeeman field reveals
the role of Ising spin-orbit coupling and mixing of odd-parity superconducting
state in influencing the low-temperature enhancement of the critical magnetic
field.
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