Subgap modes in two-dimensional magnetic Josephson junctions

Yinan Fang; Seungju Han; Stefano Chesi; Mahn Soo Choi

doi:10.1103/PhysRevB.107.115114

Subgap modes in two-dimensional magnetic Josephson junctions

Yinan Fang, Seungju Han, Stefano Chesi, Mahn Soo Choi

Department of Physics

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

We consider two-dimensional superconductor/ferromagnet/superconductor junctions, and we investigate the subgap modes along the junction interface. The subgap modes exhibit characteristics similar to the Yu-Shiba-Rusinov states that originate from the interplay between superconductivity and ferromagnetism in the magnetic junction. The dispersion relation of the subgap modes shows qualitatively different profiles depending on the transport state (metallic, half-metallic, or insulating) of the ferromagnet. As the spin splitting in the ferromagnet is increased, the subgap modes bring about a 0-π transition in the Josephson current across the junction, with the Josephson current density depending strongly on the momentum along the junction interface (i.e., the direction of the incident current). For clean superconductor-ferromagnet interfaces (i.e., strong coupling between superconductors and ferromagnet), the subgap modes develop flat quasiparticle bands that allow us to engineer the wave functions of the subgap modes along an inhomogeneous magnetic junction.

Original language	English
Article number	115114
Journal	Physical Review B
Volume	107
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevB.107.115114
Publication status	Published - 2023 Mar 15

Bibliographical note

Funding Information:
Y.F. acknowledges support from the National Natural Science Foundation of China (Grant No. 12005011). S.C. acknowledges support from the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0301602), the National Science Association Funds (Grant No. U2230402), and the National Natural Science Foundation of China (Grants No. 11974040 and No. 12150610464). S.H. and M.-S.C. were supported by the Ministry of Science and ICT of Korea (Grants No. 2017R1E1A1A03070681 and No. 2022M3H3A1063074) and by the Ministry of Education of Korea through the BK21 program.

Publisher Copyright:
© 2023 American Physical Society.

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1103/PhysRevB.107.115114

Cite this

@article{45ddd365b0cf413c95a6f4770c10ff93,

title = "Subgap modes in two-dimensional magnetic Josephson junctions",

abstract = "We consider two-dimensional superconductor/ferromagnet/superconductor junctions, and we investigate the subgap modes along the junction interface. The subgap modes exhibit characteristics similar to the Yu-Shiba-Rusinov states that originate from the interplay between superconductivity and ferromagnetism in the magnetic junction. The dispersion relation of the subgap modes shows qualitatively different profiles depending on the transport state (metallic, half-metallic, or insulating) of the ferromagnet. As the spin splitting in the ferromagnet is increased, the subgap modes bring about a 0-π transition in the Josephson current across the junction, with the Josephson current density depending strongly on the momentum along the junction interface (i.e., the direction of the incident current). For clean superconductor-ferromagnet interfaces (i.e., strong coupling between superconductors and ferromagnet), the subgap modes develop flat quasiparticle bands that allow us to engineer the wave functions of the subgap modes along an inhomogeneous magnetic junction.",

author = "Yinan Fang and Seungju Han and Stefano Chesi and Choi, {Mahn Soo}",

note = "Funding Information: Y.F. acknowledges support from the National Natural Science Foundation of China (Grant No. 12005011). S.C. acknowledges support from the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0301602), the National Science Association Funds (Grant No. U2230402), and the National Natural Science Foundation of China (Grants No. 11974040 and No. 12150610464). S.H. and M.-S.C. were supported by the Ministry of Science and ICT of Korea (Grants No. 2017R1E1A1A03070681 and No. 2022M3H3A1063074) and by the Ministry of Education of Korea through the BK21 program. Publisher Copyright: {\textcopyright} 2023 American Physical Society. ",

year = "2023",

month = mar,

day = "15",

doi = "10.1103/PhysRevB.107.115114",

language = "English",

volume = "107",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Institute of Physics Publising LLC",

number = "11",

}

TY - JOUR

T1 - Subgap modes in two-dimensional magnetic Josephson junctions

AU - Fang, Yinan

AU - Han, Seungju

AU - Chesi, Stefano

AU - Choi, Mahn Soo

N1 - Funding Information: Y.F. acknowledges support from the National Natural Science Foundation of China (Grant No. 12005011). S.C. acknowledges support from the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0301602), the National Science Association Funds (Grant No. U2230402), and the National Natural Science Foundation of China (Grants No. 11974040 and No. 12150610464). S.H. and M.-S.C. were supported by the Ministry of Science and ICT of Korea (Grants No. 2017R1E1A1A03070681 and No. 2022M3H3A1063074) and by the Ministry of Education of Korea through the BK21 program. Publisher Copyright: © 2023 American Physical Society.

PY - 2023/3/15

Y1 - 2023/3/15

N2 - We consider two-dimensional superconductor/ferromagnet/superconductor junctions, and we investigate the subgap modes along the junction interface. The subgap modes exhibit characteristics similar to the Yu-Shiba-Rusinov states that originate from the interplay between superconductivity and ferromagnetism in the magnetic junction. The dispersion relation of the subgap modes shows qualitatively different profiles depending on the transport state (metallic, half-metallic, or insulating) of the ferromagnet. As the spin splitting in the ferromagnet is increased, the subgap modes bring about a 0-π transition in the Josephson current across the junction, with the Josephson current density depending strongly on the momentum along the junction interface (i.e., the direction of the incident current). For clean superconductor-ferromagnet interfaces (i.e., strong coupling between superconductors and ferromagnet), the subgap modes develop flat quasiparticle bands that allow us to engineer the wave functions of the subgap modes along an inhomogeneous magnetic junction.

AB - We consider two-dimensional superconductor/ferromagnet/superconductor junctions, and we investigate the subgap modes along the junction interface. The subgap modes exhibit characteristics similar to the Yu-Shiba-Rusinov states that originate from the interplay between superconductivity and ferromagnetism in the magnetic junction. The dispersion relation of the subgap modes shows qualitatively different profiles depending on the transport state (metallic, half-metallic, or insulating) of the ferromagnet. As the spin splitting in the ferromagnet is increased, the subgap modes bring about a 0-π transition in the Josephson current across the junction, with the Josephson current density depending strongly on the momentum along the junction interface (i.e., the direction of the incident current). For clean superconductor-ferromagnet interfaces (i.e., strong coupling between superconductors and ferromagnet), the subgap modes develop flat quasiparticle bands that allow us to engineer the wave functions of the subgap modes along an inhomogeneous magnetic junction.

UR - http://www.scopus.com/inward/record.url?scp=85150871750&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.107.115114

DO - 10.1103/PhysRevB.107.115114

M3 - Article

AN - SCOPUS:85150871750

SN - 2469-9950

VL - 107

JO - Physical Review B

JF - Physical Review B

IS - 11

M1 - 115114

ER -

Subgap modes in two-dimensional magnetic Josephson junctions

Abstract

Bibliographical note

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this