Symmetry-selective field-induced triplet superconductivity in Ising-superconductor monolayer NbSe2
Abstract
We investigate superconductivity in monolayer NbSe2, an Ising superconductor, under an in-plane Zeeman field hx, focusing on the emergence of symmetry selected equal-spin triplet pairing. Using a self-consistent Bogoliubov--de Gennes approach with realistic hopping parameters for monolayer NbSe2 on a triangular lattice, we determine the energetically favored singlet pairing states in a range of chemical potentials μ for onsite, nearest-neighbor, and next-nearest-neighbor pairing channels, and map the resulting phase diagram in (hx,μ) plane. A momentum-resolved analysis reveals distinct dominant contributions in order parameters arise from the surroundings of Γ, K, and K' points of the Brillouin zone. We find that an in-plane magnetic field helps to induce a triplet pairing whose symmetry is determined by the parent singlet state, upon opening the triplet interaction channel. For the nonlocal pairing channels, chiral-d pairing is energetically favored and it induces chiral-p equal-spin triplet component with opposite chirality. We further find that Rashba spin-orbit coupling, relevant to substrate coupling and electrostatic gating, suppresses the superconducting orders and reduces the critical field. Our results establish a direct link between the symmetry of the parent singlet condensate and the emergent triplet superconductivity, highlighting monolayer NbSe2 as a promising platform for field-tunable mixed-parity superconducting states.
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BibTeX
@misc{biswas2026symmetryselective,
title = {{Symmetry-selective field-induced triplet superconductivity in Ising-superconductor monolayer NbSe$_2$}},
author = {Sudipta Biswas and Sudhansu S. Mandal and A. Taraphder},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.06752},
eprint = {2609.06752},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.06752},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Symmetry-selective field-induced triplet superconductivity in Ising-superconductor monolayer NbSe_2
AU - Sudipta Biswas
AU - Sudhansu S. Mandal
AU - A. Taraphder
PY - 2026
DA - 2026/09/06
PB - arXiv
DO - 10.48550/arxiv.2609.06752
UR - https://arxiv.org/abs/2609.06752
AB - We investigate superconductivity in monolayer NbSe_2, an Ising superconductor, under an in-plane Zeeman field h_x, focusing on the emergence of symmetry selected equal-spin triplet pairing. Using a self-consistent Bogoliubov--de Gennes approach with realistic hopping parameters for monolayer NbSe_2 on a triangular lattice, we determine the energetically favored singlet pairing states in a range of chemical potentials μ for onsite, nearest-neighbor, and next-nearest-neighbor pairing channels, and map the resulting phase diagram in (h_x,μ) plane. A momentum-resolved analysis reveals distinct dominant contributions in order parameters arise from the surroundings of Γ, K, and K' points of the Brillouin zone. We find that an in-plane magnetic field helps to induce a triplet pairing whose symmetry is determined by the parent singlet state, upon opening the triplet interaction channel. For the nonlocal pairing channels, chiral-d pairing is energetically favored and it induces chiral-p equal-spin triplet component with opposite chirality. We further find that Rashba spin-orbit coupling, relevant to substrate coupling and electrostatic gating, suppresses the superconducting orders and reduces the critical field. Our results establish a direct link between the symmetry of the parent singlet condensate and the emergent triplet superconductivity, highlighting monolayer NbSe_2 as a promising platform for field-tunable mixed-parity superconducting states.
ER -