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

作　　者：卢伟涛 毛岳 孙庆丰 Wei-Tao Lu;Yue Mao;Qing-Feng Sun(School of Sciences,Nantong University,Nantong 226019,China;International Center for Quantum Materials,School of Physics,Peking University,Beijing 100871,China;Hefei National Laboratory,Hefei 230088,China)

机构地区：[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

出　　处：《Chinese Physics B》2023年第10期38-44,共7页中国物理B（英文版）

基　　金：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);the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB28000000)。

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 

分 类 号：O469[理学—凝聚态物理]