A1 Journal article (refereed)
Nonreciprocal Josephson Linear Response (2024)

Virtanen, P., & Heikkilä, T. T. (2024). Nonreciprocal Josephson Linear Response. Physical Review Letters, 132(4), Article 046002. https://doi.org/10.1103/PhysRevLett.132.046002

JYU authors or editors

Virtanen, Pauli
Heikkilä, Tero

Publication details

All authors or editors: Virtanen, Pauli; Heikkilä, Tero T.

Journal or series: Physical Review Letters

ISSN: 0031-9007

eISSN: 1079-7114

Publication year: 2024

Publication date: 22/01/2024

Volume: 132

Issue number: 4

Article number: 046002

Publisher: American Physical Society (APS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevLett.132.046002

Publication open access: Not open

Publication channel open access:

Publication is parallel published: https://arxiv.org/abs/2306.12295

Abstract

We consider the finite-frequency response of multiterminal Josephson junctions and show how nonreciprocity in them can show up at linear response, in contrast to the static Josephson diodes featuring nonlinear nonreciprocity. At finite frequencies, the response contains dynamic contributions to the Josephson admittance, featuring the effects of Andreev bound state transitions along with Berry phase effects, and reflecting the breaking of the same symmetries as in Josephson diodes. We show that outside exact Andreev resonances, the junctions feature nonreciprocal reactive response. As a result, the microwave transmission through those systems is nondissipative, and the electromagnetic scattering can approach complete nonreciprocity. Besides providing information about the nature of the weak link energy levels, the nonreciprocity can be utilized to create nondissipative and small-scale on-chip circulators whose operation requires only rather small magnetic fields.

Keywords: superconductors; superconductivity; diodes

Fields of science: