Detecting Perfect Transmission in Josephson Junctions on the Surface of Three Dimensional Topological Insulators

ORAL

Abstract

We consider Josephson junctions on surfaces of three dimensional topological insulator nanowires. We find that in the presence of a parallel magnetic field, short junctions on nanowires show signatures of a perfectly transmitted mode capable of supporting Majorana fermions. Such signatures appear in the current-phase relation in the presence or absence of the fermion parity anomaly, and are most striking when considering the critical current as a function of flux $\Phi$, which exhibits a peak around $\Phi = h/2e$. The peak sharpens in the presence of disorder at low but finite chemical potentials, and can be easily disentangled from weak-antilocalization effects. The peak also survives at small but finite temperatures, and represents a realistic and robust hallmark for perfect transmission and the emergence of Majorana physics inside the wire.

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Authors

  • Jens H. Bardarson

    Max-Planck-Institut f\"ur Physik komplexer Systeme, Max Planck Institute for the Physics of Complex Systems, Dresden

  • Roni Ilan

    University of California, Berkeley

  • H.-S. Sim

    Korea Advanced Institute of Science and Technology

  • Joel Moore

    University of California, Berkeley, CA, Univesity of California, Berkeley and Lawrence Berkeley National Laboratory, University of California, Berkeley, University of California, Berkeley and Lawrence Berkeley National Laboratory, University of California, Berkeley, Lawrence Berkeley National Laboratory