Valley excitons in two-dimensional semiconductors

作     者：Hongyi Yu Xiaodong Cui Xiaodong Xu Wang Yao 

作者机构：Department of PhysicsThe University of Hong Kong Center of Theoretical and Computational PhysicsThe University of Hong Kong Department of PhysicsUniversity of Washington Department of Material Science and EngineeringUniversity of Washington 

出 版 物：《National Science Review》 (国家科学评论(英文版))

年 卷 期：2015年第2卷第1期

页      面：57-70页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：support by the Croucher Foundation(Croucher Innovation Award),the University of Hong Kong(OYA),and the RGC of Hong Kong(HKU17305914P) support by RGC(HKU9/CRF/13G)and UGC(AoE/P-04/08)of Hong Kong support from DoE,BES,Materials Science and Engineering Division(DE-SC0008145) the National Science Foundation(DMR-1150719),and the National Science Foundation,Oice of Emerging Frontiers in Research and Innovation(EFRI-1433496) 

主　　题：exciton valley physics two-dimensional semiconductor transition metal dichalcogenides 

摘      要：Monolayer group-VIB transition-metal dichalcogenides have recently emerged as a new class of semiconductors in the two-dimensional limit. he atractive properties include the visible range direct band gap ideal for exploring optoelectronic applications; the intriguing physics associated with spin and valley pseudospin of carriers which implies potentials for novel electronics based on these internal degrees of freedom; the exceptionally strong Coulomb interaction due to the two-dimensional geometry and the large efective masses. he physics of excitons, the bound states of electrons and holes, has been one of the most actively studied topics on these two-dimensional semiconductors, where the excitons exhibit remarkably new features due to the strong Coulomb binding, the valley degeneracy of the band edges and the valley-dependent optical selection rules for interband transitions. Here, we give a brief overview of the experimental and theoretical indings on excitons in two-dimensional transition-metal dichalcogenides,with focus on the novel properties associated with their valley degrees of freedom.