Local and Nonlocal Transport Spectroscopy in Planar Josephson Junctions

Autor: Banerjee, A., Lesser, O., Rahman, M. A., Thomas, C., Wang, T., Manfra, M. J., Berg, E., Oreg, Y., Stern, Ady, Marcus, C. M.
Rok vydání: 2022
Předmět:
Zdroj: Phys. Rev. Lett. 130, 096202 (2023)
Druh dokumentu: Working Paper
DOI: 10.1103/PhysRevLett.130.096202
Popis: We report simultaneously acquired local and nonlocal transport spectroscopy in a phase-biased planar Josephson junction based on an epitaxial InAs/Al hybrid two-dimensional heterostructure. Quantum point contacts at the junction ends allow measurement of the 2 x 2 matrix of local and nonlocal tunneling conductances as a function of magnetic field along the junction, phase difference across the junction, and carrier density. A closing and reopening of a gap was observed in both the local and nonlocal tunneling spectra as a function of magnetic field. For particular tunings of junction density, gap reopenings were accompanied by zero-bias conductance peaks (ZBCPs) in local conductances. End-to-end correlation of gap reopening was strong, while correlation of local ZBCPs was weak. A simple, disorder-free model of the device shows comparable conductance matrix behavior associated with a topological phase transition. Phase dependence helps distinguish possible origins of the ZBCPs.
Databáze: arXiv