光电调控的磁性WSe_(2)超晶格中的自旋和谷极化输运  

Optical and electric control of spin and valley polarization transport in magnetic WSe_(2)superlattice

作　　者：罗国忠[1] LUO Guozhong(Department of Physics Xinzhou Teachers University,Xinzhou,Shanxi,China)

机构地区：[1]忻州师范学院物理系,山西忻州

出　　处：《北京师范大学学报（自然科学版）》2024年第1期9-20,共12页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(12047521);山西省自然科学基金资助项目(202203021212180)。

摘　　要：基于磁性WSe_(2)超晶格系统,探讨了非共振圆偏振光与栅极电压及其对隧穿、谷极化及自旋极化的影响;发现了单层WSe_(2)的弹道输运操纵,以及基于磁性WSe_(2)的NM-FM-NM结的周期性阵列量子输运的调控.结果表明:通过增加势垒的数量,圆偏振光临界值可消除透射能隙;圆偏振光和栅极电压可视为一个透射阀,也可用于控制自旋和谷极化的敏感旋钮.发现了在WSe_(2)超晶格中的克莱因隧穿是自旋-谷相关的;自旋-谷极化可以利用栅极电压和圆偏振光来调整和转换.The magnetic WSe_(2) superlattice system is examined here to explore effects of non-resonant circularly polarized light and gate voltage on tunneling,spin and valley polarization.Manipulation of ballistic transport in single-layer WSe_(2),as well as control of the quantum transport in the periodic array of NM-FM-NM junctions based on magnetic WSe_(2) are identified.The critical value of circularly polarized light is found to eliminate the transmission energy gap by increasing the number of potential barriers.The circularly polarized light and gate voltage could be regarded as a transmission valve and a sensitive knob for controlling the spin and valley polarization.Klein tunneling in WSe_(2) super lattice is spin-valley dependent.Spin-valley polarization can be adjusted and converted by grid voltage and circularly polarized light.

关 键 词：磁性WSe_(2) 超晶格 圆偏振光 栅极电压 自旋输运 谷极化输运 

分 类 号：O488[理学—固体物理]