TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.12.6.197
TI  - Josephson junctions of topological nodal superconductors
PY  - 2022/06/23
UR  - https://scipost.org/SciPostPhys.12.6.197
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 12
IS  - 6
SP  - 197
A1  - Seshadri, Ranjani
AU  - Khodas, Maxim
AU  - Meidan, Dganit
AB  - 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 $4\pi$ 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 topological 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.
ER  -

@Article{10.21468/SciPostPhys.12.6.197,
	title={{Josephson junctions of topological nodal superconductors}},
	author={Ranjani Seshadri and Maxim Khodas and Dganit Meidan},
	journal={SciPost Phys.},
	volume={12},
	pages={197},
	year={2022},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.12.6.197},
	url={https://scipost.org/10.21468/SciPostPhys.12.6.197},
}