Switching effects in superconductor/ferromagnet/superconductor graphene junctions

doi:10.1088/1674-1056/22/12/127401

Chin. Phys. B ›› 2013, Vol. 22 ›› Issue (12): 127401-127401.doi: 10.1088/1674-1056/22/12/127401

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Switching effects in superconductor/ferromagnet/superconductor graphene junctions

李晓薇^{a b}, 刘丹^{a c}, 鲍艳辉^{a c}

a School of Physics and Electronic Electrical Engineering and Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, Huaiyin Normal University, Huaian 223300, China;
b State Key Laboratory of Functional Materials for Informatics, (Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences), Shanghai 200050, China;
c School of Physics, Northeast Normal University, Changchun 130024, China

收稿日期:2013-05-01 修回日期:2013-08-16 出版日期:2013-10-25 发布日期:2013-10-25
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11074088).

Switching effects in superconductor/ferromagnet/superconductor graphene junctions

Li Xiao-Wei (李晓薇)^{a b}, Liu Dan (刘丹)^{a c}, Bao Yan-Hui (鲍艳辉)^{a c}

a School of Physics and Electronic Electrical Engineering and Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, Huaiyin Normal University, Huaian 223300, China;
b State Key Laboratory of Functional Materials for Informatics, (Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences), Shanghai 200050, China;
c School of Physics, Northeast Normal University, Changchun 130024, China

Received:2013-05-01 Revised:2013-08-16 Online:2013-10-25 Published:2013-10-25
Contact: Li Xiao-Wei E-mail:lxw@hytc.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11074088).

摘要/Abstract

摘要： The Josephson effect in the superconductor/ferromagnet/superconductor (SFS) graphene Josephson junction is studied using the Dirac Bogoliubov-de Gennes (DBdG) formalism. It is shown that the SFS graphene junction drives 0–π transition with the increasing of p=h₀L/v_Fħ, which captures the effects of both the exchange field and the length of the junction; the spin-down current is dominant. The 0 state is stable for p < p_c (critical value p_c ≈ 0.80) and the π state is stable for p > p_c, where the free energy minima are at φ_g=0 and φ_g=π, respectively. The coexistence of the 0 and π states appears in the vicinity of p_c.

关键词: superconductor junction, grapheme, switching effect

Abstract: The Josephson effect in the superconductor/ferromagnet/superconductor (SFS) graphene Josephson junction is studied using the Dirac Bogoliubov-de Gennes (DBdG) formalism. It is shown that the SFS graphene junction drives 0–π transition with the increasing of p=h₀L/v_Fħ, which captures the effects of both the exchange field and the length of the junction; the spin-down current is dominant. The 0 state is stable for p < p_c (critical value p_c ≈ 0.80) and the π state is stable for p > p_c, where the free energy minima are at φ_g=0 and φ_g=π, respectively. The coexistence of the 0 and π states appears in the vicinity of p_c.

Key words: superconductor junction, grapheme, switching effect

中图分类号: (Tunneling phenomena; Josephson effects)

74.50.+r

74.70.Wz (Carbon-based superconductors) 74.81.Fa (Josephson junction arrays and wire networks)

李晓薇, 刘丹, 鲍艳辉. Switching effects in superconductor/ferromagnet/superconductor graphene junctions[J]. Chin. Phys. B, 2013, 22(12): 127401-127401.

Li Xiao-Wei (李晓薇), Liu Dan (刘丹), Bao Yan-Hui (鲍艳辉). Switching effects in superconductor/ferromagnet/superconductor graphene junctions[J]. Chin. Phys. B, 2013, 22(12): 127401-127401.

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Switching effects in superconductor/ferromagnet/superconductor graphene junctions

Switching effects in superconductor/ferromagnet/superconductor graphene junctions

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