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Josephson effect in two-band superconductors

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Title: Josephson effect in two-band superconductors
Authors: Sasaki, Akihiro Browse this author
Ikegaya, Satoshi Browse this author
Habe, Tetsuro Browse this author
Golubov, Alexander A. Browse this author
Asano, Yasuhiro Browse this author →KAKEN DB
Issue Date: 4-May-2020
Publisher: American Physical Society (APS)
Journal Title: Physical Review B
Volume: 101
Issue: 18
Start Page: 184501
Publisher DOI: 10.1103/PhysRevB.101.184501
Abstract: We study theoretically the Josephson effect between two two-band superconductors respecting time-reversal symmetry, where we assume a spin-singlet s-wave pair potential in each conduction band. The superconducting phase at the first band phi(1) and that at the second band phi(2) characterize a two-band superconducting state. We consider a Josephson junction where an insulating barrier separates two such two-band superconductors. By applying the tunnel Hamiltonian description, the Josephson current is calculated in terms of the anomalous Green's function on either side of the junction. We find that the Josephson current consists of three components which depend on three types of phase differences across the junction: the phase difference at the first band delta(phi 1), the phase difference at the second band delta(phi 2), and the difference at the center-of-mass phase (delta(phi 1) + delta(phi 2))/2. A Cooper pair generated by the band hybridization carries the last current component. We discuss the relation between the Josephson current calculated in theories and that observed in experiments.
Rights: Copyright (2020) by The American Physical Society.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 浅野 泰寛

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