Gate-Dependent Transport in Multi-Terminal Josephson Junctions

ORAL

Abstract

Josephson coupling of three or more superconducting leads through a material with few conducting modes has been predicted to give rise to topological effects. Such behavior, of relevance for topologically-protected quantum bits, would lead to specific transport features measured between terminals, with topological phase transitions occurring as a function of relative phase and voltage biases. Here we study the effects on transport of several top-gating arrangements on multi-terminal Josephson junctions with many conducting modes based on an InAs 2DEG proximitized with an epitaxial aluminum layer and many conducting modes. The superconducting features can be accurately simulated by a network of RCSJ junctions. [1]

1. G. V. Graziano, J. S. Lee, M. Pendharkar, C. J. Palmstrom and V. S. Pribiag. arXiv:1905.11730 (2019)

**This work was supported primarily by the National Science Foundation under Award No. DMR-1554609. The work at UCSB was supported by the Department of Energy under Award No. DE-SC0019274. The development of the epitaxial growth process was supported by Microsoft Research.

–

Presenters

  • Gino Graziano

    • University of Minnesota

Authors

  • Gino Graziano

    • University of Minnesota

  • Joon Sue Lee

    • University of California Santa Barbara
    • University of Tennessee, Knoxville

  • Sean Harrington

    • University of California, Santa Barbara

  • Mihir Pendharkar

    • Electrical and Computer Engineering, University of California Santa Barbara
    • University of California Santa Barbara
    • University of California, Santa Barbara

  • Chris J Palmstrom

    • California NanoSystems Institute, University of California Santa Barbara
    • University of California, Santa Barbara
    • University of California Santa Barbara

  • Vlad Pribiag

    • University of Minnesota