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DS: Fachverband Dünne Schichten
DS 12: 2D Materials I
DS 12.4: Vortrag
Mittwoch, 11. März 2026, 10:15–10:30, REC/C213
Pairing symmetry of Ising superconductors via the upper critical field — •Lena Engström1, Ludovica Zullo2, Tristan Cren3, Andrej Mesaros1, and Pascal Simon1 — 1Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay, France — 2Institut für Theoretische Physik und Astrophysik and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, 97074 Würzburg, Germany — 3Sorbonne Université, CNRS, Institut des Nanosciences de Paris, UMR7588, F-75252 Paris, France
Several conflicting predictions have been made for the symmetry of the pairing in transition metal dichalcogenide (TMD) superconductors. An indication of if singlet or triplet pairing is present can be given by the upper critical field (Hc2), the magnetic field required to fully suppress superconductivity. Monolayer 1H-NbSe2 and 1H-TaS2 have extremely large critical fields, due to a large Ising spin-orbit coupling (SOC), yet they do not scale with SOC and temperature as expected for other TMDs. In our work on few-layer 2H-stacked TMDs, we highlight that the Ising SOC has nodal lines in the Brillouin zone imposed by symmetry. By deriving the susceptibility, we have found that the scaling of the critical field can be traced back to whether the Fermi surface intersects with these lines or not. Reinterpreting existing experimental data, we find that a predominantly singlet order is consistent with the measured Hc2. We propose two experiments where a signature of spin-singlet pairing would be visible, while discussing the possibility of mixed-parity pairing.
Keywords: Superconductivity; Transition metal dichalcogenides; Pairing symmetries; Monolayers