Van Tuan Dinh, Shi Su-Fei, Xu Xiaodong, Crooker Scott A, Dery Hanan
Department of Electrical and Computer Engineering, University of Rochester, Rochester, New York 14627, USA.
Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, USA.
Phys Rev Lett. 2022 Aug 12;129(7):076801. doi: 10.1103/PhysRevLett.129.076801.
In the archetypal monolayer semiconductor WSe_{2}, the distinct ordering of spin-polarized valleys (low-energy pockets) in the conduction band allows for studies of not only simple neutral excitons and charged excitons (i.e., trions), but also more complex many-body states that are predicted at higher electron densities. We discuss magneto-optical measurements of electron-rich WSe_{2} monolayers and interpret the spectral lines that emerge at high electron doping as optical transitions of six-body exciton states ("hexcitons") and eight-body exciton states ("oxcitons"). These many-body states emerge when a photoexcited electron-hole pair interacts simultaneously with multiple Fermi seas, each having distinguishable spin and valley quantum numbers. In addition, we explain the relations between dark trions and satellite optical transitions of hexcitons in the photoluminescence spectrum.
在典型的单层半导体二硒化钨（WSe₂）中，导带中自旋极化谷（低能口袋）的独特排序不仅允许研究简单的中性激子和带电激子（即三激子），还能研究在更高电子密度下预测的更复杂的多体状态。我们讨论了富电子二硒化钨单层的磁光测量，并将在高电子掺杂时出现的光谱线解释为六体激子态（“六重激子”）和八体激子态（“八重激子”）的光学跃迁。当光激发的电子 - 空穴对与多个具有可区分自旋和谷量子数的费米海同时相互作用时，这些多体状态就会出现。此外，我们解释了光致发光光谱中暗三激子与六重激子的卫星光学跃迁之间的关系。
