Josephson Junctions of Nodal Superconductors: Role of Spin-orbit coupling
ORAL
Abstract
A monolayer transition metal dichalcogenide (TMD) such as niobium diselenide (NbSe2 ) exhibits unique superconducting properties.
When an externally applied in-plane magnetic field is increased beyond the Pauli critical limit, superconductivity survives due to the
presence of a strong Ising spin-orbit coupling. However, a quantum phase transition occurs into a nodal superconducting phase hosting
Majorana flat bands. This is reflected in the 4π periodicity of the Josephson current-phase relation, which is a function of the momentum
perpendicular to the direction of the current as well as the magnitude of the applied magnetic field. By including the effect of a Rashba
spin-orbit coupling, the behavior of this Josephson current becomes sensitive also to the direction of the in-plane field.
When an externally applied in-plane magnetic field is increased beyond the Pauli critical limit, superconductivity survives due to the
presence of a strong Ising spin-orbit coupling. However, a quantum phase transition occurs into a nodal superconducting phase hosting
Majorana flat bands. This is reflected in the 4π periodicity of the Josephson current-phase relation, which is a function of the momentum
perpendicular to the direction of the current as well as the magnitude of the applied magnetic field. By including the effect of a Rashba
spin-orbit coupling, the behavior of this Josephson current becomes sensitive also to the direction of the in-plane field.
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Publication: R. Seshadri, M. Khodas, D. Meidan, SciPost Phys. 12, 197 (2022)
Presenters
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Ranjani Seshadri
Ben Gurion University of the Negev
Authors
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Ranjani Seshadri
Ben Gurion University of the Negev
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Maxim Khodas
Hebrew University of Jerusalem
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Dganit Meidan
Ben Gurion University, Ben Gurion University, Israel