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Helicity‐dependent THz emission induced by ultrafast spin photocurrent in nodal‐line semimetal candidate Mg3Bi2

查看全文 作　　者：Mingyu [1]Tong;Yuze [1]Hu;Xiangnan [3]Xie;Xiegang [5]Zhu;Zhenyu [2,4]Wang;Xiang'ai [1]Cheng;Tian [1]Jiang 高影响力作者 机构地区：[1]College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China;[2]National Innovation Institute of Defense Technology,Academy of Military Sciences PLA China,Beijing 100010,China;[3]State Key Laboratory of High Performance Computing,College of Computer,National University of Defense Technology,Changsha 410073,China;[4]Beijing Academy of Quantum Information Sciences,Beijing 100193,China;[5]Science and Technology on Surface Physics and Chemistry Laboratory,Jiangyou 621908,China高影响力机构 出　　处：《Opto-Electronic Advances》索引2020年第3卷第12期,共8页高影响力期刊 基　　金：We thank Prof.J.B.Qi for helpful discussions and are grateful for financial support from the National Natural Science Foundation of China(Grant Nos.11804387,11802339,11805276,11902358,61805282,and 61801498);the Scientific Researches Foundation of National University of Defense Technology(Grant Nos.ZK18-03-22,ZK18-01-03 and ZK18-03-36). 摘　　要：Helicity-dependent ultrafast spin current generated by circularly polarized photons in topological materials holds the crux to many technological improvements,such as quantum communications,on-chip communication processing and storage.Here,we present the manipulation of helicity-dependent terahertz emission generated in a nodal line semimetal candidate Mg3Bi2 by using photon polarization states.The terahertz emission is mainly ascribed to the helicity-dependent photocurrent that is originated from circular photogalvanic effects,and the helicity-independent photocurrent that is attributed to linear photogalvanic effect.Our work will inspire more explorations into novel nodal line semimetals and open up new opportunities for developing ultrafast optoelectronics in the topological system. 关 键 词：terahertz spin photocurrent nodal-line semimetal topological material
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