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Multiplet supercurrent in Josephson tunneling circuits

by André Melo, Valla Fatemi, Anton R. Akhmerov

Submission summary

As Contributors: Anton Akhmerov · André Melo
Arxiv Link: https://arxiv.org/abs/2104.11239v4 (pdf)
Code repository: https://zenodo.org/record/5552380
Date submitted: 2021-10-07 10:47
Submitted by: Melo, André
Submitted to: SciPost Physics
Academic field: Physics
Specialties:
  • Condensed Matter Physics - Theory
  • Quantum Physics
Approach: Theoretical

Abstract

The multi-terminal Josephson effect allows DC supercurrent to flow at finite commensurate voltages. Existing proposals to realize this effect rely on nonlocal Andreev processes in superconductor-normal-superconductor junctions. However, this approach requires precise control over microscopic states and is obscured by dissipative current. We show that standard tunnel Josephson circuits also support multiplet supercurrent mediated only by local tunneling processes. Furtheremore, we observe that the supercurrents persist even in the high charging energy regime in which only sequential Cooper transfers are allowed. Finally, we demonstrate that the multiplet supercurrent in these circuits has a quantum geometric component that is distinguinshable from the well-known adiabatic contribution.

Current status:
Editor-in-charge assigned


List of changes

- Added analytical expression of the classical quartet supercurrent
- Computed quartet current-phase relation with and without Berry curvature contribution
- Clarified quantity plotted in Fig. 3b
- Extended discussion about connection with SNS experiments


Reports on this Submission

Report 1 by Regis Melin on 2021-10-15 (Invited Report)

Report

The authors convincingly answered my comments. The manuscript is important to the field and will certainly inspire future works. I am glad to recommend publication.

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