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arXiv · 2205.09419

Local and Nonlocal Transport Spectroscopy in Planar Josephson Junctions

A. Banerjee·O. Lesser·M. A. Rahman·C. Thomas·T. Wang·M. J. Manfra·E. Berg·Y. Oreg·Ady Stern·C. M. Marcus
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Abstract

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.

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A. Banerjee, O. Lesser, M. A. Rahman, C. Thomas, T. Wang, M. J. Manfra, E. Berg, Y. Oreg, Ady Stern, C. M. Marcus. 2022-05-19. Local and Nonlocal Transport Spectroscopy in Planar Josephson Junctions. https://doi.org/10.1103/physrevlett.130.096202

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