Energy spectrum and current-phase relation of a nanowire Josephson junction close to the topological transition
10 December 2019
Mesoscale and Nanoscale Physics
Vladislav D. Kurilovich,
Pavel D. Kurilovich,
Bernard van Heck,
Leonid I. Glazman,
A magnetic field drives a topological transition in proximitized nanowires, marked by Majorana modes
The 4π-periodic Josephson effect emerges gradually near the transition point
An unusual gapless phase arises from strong Majorana coupling across the junction
This gapless phase leads to observable signatures in the Josephson current
The results provide guidance for experiments probing Majorana physics and topological transitions
Uncovering hidden quantum transitions in nanowire Josephson junctions
This paper investigates the properties of Josephson junctions formed in semiconducting nanowires with strong spin-orbit coupling, proximitized by an s-wave superconductor. A parallel magnetic field drives a topological quantum phase transition in the nanowire, marked by the emergence of Majorana zero modes that couple across the junction. The paper shows that the 4π-periodic Josephson effect associated with Majorana modes develops gradually near the transition point, making it challenging to detect. However, the excitation spectrum reveals an unusual gapless phase arising from the strong Majorana coupling, which leads to observable signatures in the Josephson current. The results provide guidance for future experiments probing Majorana physics and topological transitions in nanowires.
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