Photoinduced valley-dependent equal-spin Andreev reflection in Ising superconductor junction

doi:10.1088/1674-1056/aceee6

中国物理B ›› 2023, Vol. 32 ›› Issue (10): 107403-107403.doi: 10.1088/1674-1056/aceee6

所属专题： SPECIAL TOPIC — Valleytronics

Photoinduced valley-dependent equal-spin Andreev reflection in Ising superconductor junction

Wei-Tao Lu(卢伟涛)^1,†, Yue Mao(毛岳)², and Qing-Feng Sun(孙庆丰)^2,3,‡

1 School of Sciences, Nantong University, Nantong 226019, China;
2 International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China;
3 Hefei National Laboratory, Hefei 230088, China

收稿日期:2023-06-13 修回日期:2023-08-07 接受日期:2023-08-10 出版日期:2023-09-21 发布日期:2023-09-22
通讯作者: Wei-Tao Lu, Qing-Feng Sun E-mail:physlu@163.com;sunqf@pku.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11974153, 12374034 and 11921005), the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302403), and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB28000000).

Photoinduced valley-dependent equal-spin Andreev reflection in Ising superconductor junction

Wei-Tao Lu(卢伟涛)^1,†, Yue Mao(毛岳)², and Qing-Feng Sun(孙庆丰)^2,3,‡

1 School of Sciences, Nantong University, Nantong 226019, China;
2 International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China;
3 Hefei National Laboratory, Hefei 230088, China

Received:2023-06-13 Revised:2023-08-07 Accepted:2023-08-10 Online:2023-09-21 Published:2023-09-22
Contact: Wei-Tao Lu, Qing-Feng Sun E-mail:physlu@163.com;sunqf@pku.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11974153, 12374034 and 11921005), the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302403), and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB28000000).

摘要/Abstract

摘要： The Ising spin-orbit coupling could give rise to the spin-triplet Cooper pairs and equal-spin Andreev reflection (AR) in Ising superconductors. Here we theoretically study the valley-dependent equal-spin AR in a ferromagnet/Ising superconductor junction with a circularly polarized light applied to the ferromagnet. Because of the spin-triplet Cooper pairs and the optical irradiation, eight kinds of AR processes appear in the junction, including equal-spin AR and normal AR, the strengths and properties of which strongly depend on the valley degree of freedom. The AR probabilities for the incident electron from the two valleys exhibit certain symmetry with respect to the magnetization angle and the effective energy of light. The equal-spin AR and normal AR present different features and resonant behaviors near the superconducting gap edges. Due to equal-spin-triplet Cooper pairs, not only charge supercurrent but also spin supercurrent can transport in the Ising superconductors. The differential spin conductance for electron injecting from the two valleys can be controlled by the circularly polarized light.

关键词: valleytronics, equal-spin Andreev reflection, spin-triplet Cooper pairs, Ising superconductor junction

Abstract: The Ising spin-orbit coupling could give rise to the spin-triplet Cooper pairs and equal-spin Andreev reflection (AR) in Ising superconductors. Here we theoretically study the valley-dependent equal-spin AR in a ferromagnet/Ising superconductor junction with a circularly polarized light applied to the ferromagnet. Because of the spin-triplet Cooper pairs and the optical irradiation, eight kinds of AR processes appear in the junction, including equal-spin AR and normal AR, the strengths and properties of which strongly depend on the valley degree of freedom. The AR probabilities for the incident electron from the two valleys exhibit certain symmetry with respect to the magnetization angle and the effective energy of light. The equal-spin AR and normal AR present different features and resonant behaviors near the superconducting gap edges. Due to equal-spin-triplet Cooper pairs, not only charge supercurrent but also spin supercurrent can transport in the Ising superconductors. The differential spin conductance for electron injecting from the two valleys can be controlled by the circularly polarized light.

Key words: valleytronics, equal-spin Andreev reflection, spin-triplet Cooper pairs, Ising superconductor junction

中图分类号: (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)

71.70.Ej

74.45.+c (Proximity effects; Andreev reflection; SN and SNS junctions) 72.25.-b (Spin polarized transport)

Wei-Tao Lu(卢伟涛), Yue Mao(毛岳), and Qing-Feng Sun(孙庆丰). Photoinduced valley-dependent equal-spin Andreev reflection in Ising superconductor junction[J]. 中国物理B, 2023, 32(10): 107403-107403.

Wei-Tao Lu(卢伟涛), Yue Mao(毛岳), and Qing-Feng Sun(孙庆丰). Photoinduced valley-dependent equal-spin Andreev reflection in Ising superconductor junction[J]. Chin. Phys. B, 2023, 32(10): 107403-107403.

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Photoinduced valley-dependent equal-spin Andreev reflection in Ising superconductor junction

Photoinduced valley-dependent equal-spin Andreev reflection in Ising superconductor junction

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