Phase jumps in Josephson junctions with time-dependent spin–orbit coupling

Author:

Monroe David1ORCID,Shen Chenghao1ORCID,Tringali Dario1ORCID,Alidoust Mohammad2ORCID,Zhou Tong13ORCID,Žutić Igor1ORCID

Affiliation:

1. University at Buffalo, State University of New York 1 , Buffalo, New York 14260-1500, USA

2. Department of Physics, Norwegian University of Science and Technology 2 , N-7491 Trondheim, Norway

3. Eastern Institute for Advanced Study, Eastern Institute of Technology 3 , Ningbo, Zhejiang 315200, China

Abstract

Planar Josephson junctions (JJs), based on common superconductors and III–V semiconductors, are sought for Majorana states and fault-tolerant quantum computing. However, with gate-tunable spin–orbit coupling (SOC), we show that the range of potential applications of such JJs becomes much broader. The time-dependent SOC offers unexplored mechanisms for switching JJs, accompanied by the 2π-phase jumps and the voltage pulses corresponding to the single-flux-quantum transitions, key to high-speed and low-power superconducting electronics. In a constant applied magnetic field, with Rashba and Dresselhaus SOC, anharmonic current-phase relations, calculated microscopically in these JJs, yield a nonreciprocal transport and superconducting diode effect. Together with the time-dependent SOC, this allows us to identify a switching mechanism at no applied current bias, which supports fractional-flux-quantum superconducting circuits and neuromorphic computing.

Funder

National Science Foundation

Office of Naval Research

Publisher

AIP Publishing

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