IMSc Webinar

Josephson Junction of Nodal Superconductors

Ranjani Seshadri

Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva, Israel

Monolayer and few-layer transition metal dichalcogenides (TMDs) have
been suggested
as a platform to study intrinsic and induced unconventional
superconductivity. The presence of a strong Ising spin-orbit coupling in
these materials locks the spins perpendicular to the surface resulting in
remarkable stability to an in-plane magnetic field even beyond the Pauli
critical limit. Upon increasing the in-plane magnetic field beyond the Pauli
limit, a quantum phase transition occurs into a topological
nodal-superconducting phase which is characterized by Majorana flat bands.
We use the Bogoliubov-de Gennes (BdG) Hamiltonian formalism to show that
the unique topological properties of this non-trivial phase are reflected
in the current across junctions of nodal superconductors separated by
an insulating
barrier. By studying the dependence of the Josephson current on the phase
difference between two sides of the junction, one can infer these
topological properties.

Reference: R.Seshadri, M. Khodas, and D. Meidan,
arxiv.org/abs/2201.11514

Zoom link:

Topic: Ranjani Seshadri's talk
Time: Apr 6, 2022 15:30 India

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