Josephson junctions of topological nodal superconductors

Ranjani Seshadri, Maxim Khodas, Dganit Meidan

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3 Scopus citations
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Transition metal dichalcogenides (TMDs) offer a unique platform to study unconventional superconductivity, owing to the presence of strong spin-orbit coupling and a remarkable stability to an in-plane magnetic field. A recent study found that when an in-plane field applied to a superconducting monolayer TMD is increased beyond the Pauli critical limit, a quantum phase transition occurs into a topological nodal superconducting phase which hosts Majorana flat bands. We study the current-phase relation of this nodal superconductor in a Josephson junction geometry. We find that the nodal superconductivity is associated with an energy-phase relation that depends on the momentum transverse to the current direction, with a 4π periodicity in between pairs of nodal points. We interpret this response as a result of a series of quantum phase transitions, driven by the transverse momentum, which separate a trivial phase and two distinct topologically non-trivial phases characterized by different winding invariants. This analysis sheds light on the stability of the Majorana flat bands to symmetry-breaking perturbations.

Original languageEnglish
Article number197
JournalSciPost Physics
Issue number6
StatePublished - 23 Jun 2022


  • Condensed Matter - Superconductivity
  • Condensed Matter - Mesoscale and Nanoscale Physics

ASJC Scopus subject areas

  • General Physics and Astronomy


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