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
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.
Fund: 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).
Corresponding Authors:
Wei-Tao Lu, Qing-Feng Sun
E-mail: physlu@163.com;sunqf@pku.edu.cn
Cite this article:
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 2023 Chin. Phys. B 32 107403
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