Valley polarization in transition metal dichalcogenide layered semiconductors:Generation,relaxation,manipulation and transport  

作　　者：马惠 朱耀杰 刘宇伦 白瑞雪 张喜林 任琰博 蒋崇云 Hui Ma;Yaojie Zhu;Yulun Liu;Ruixue Bai;Xilin Zhang;Yanbo Ren;Chongyun Jiang(School of Physical Science and Technology,Tiangong University,Tianjin 300387,China;College of Electronic Information and Optical Engineering,Nankai University,Tianjin 300350,China)

机构地区：[1]School of Physical Science and Technology,Tiangong University,Tianjin 300387,China [2]College of Electronic Information and Optical Engineering,Nankai University,Tianjin 300350,China

出　　处：《Chinese Physics B》2023年第10期1-14,共14页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2022YFB2803900);the National Natural Science Foundation of China(Grant Nos.61704121 and 61974075);Natural Science Foundation of Tianjin City(Grant Nos.19JCQNJC00700 and 22JCZDJC00460);Tianjin Municipal Education Commission(Grant No.2019KJ028);Fundamental Research Funds for the Central Universities(Grant No.22JCZDJC00460)。

摘　　要：In recent years,valleytronics researches based on 2D semiconducting transition metal dichalcogenides have attracted considerable attention.On the one hand,strong spin–orbit interaction allows the presence of spin–valley coupling in this system,which provides spin addressable valley degrees of freedom for information storage and processing.On the other hand,large exciton binding energy up to hundreds of me V enables excitons to be stable carriers of valley information.Valley polarization,marked by an imbalanced exciton population in two inequivalent valleys(+K and-K),is the core of valleytronics as it can be utilized to store binary information.Motivated by the potential applications,we present a thorough overview of the recent advancements in the generation,relaxation,manipulation,and transport of the valley polarization in nonmagnetic transition metal dichalcogenide layered semiconductors.We also discuss the development of valleytronic devices and future challenges in this field.

关 键 词：valley polarization nonmagnetic transition metal dichalcogenide layered semiconductors EXCITON 

分 类 号：O469[理学—凝聚态物理]