Six-Body and Eight-Body Exciton States in Monolayer WSe2
Six-Body and Eight-Body Exciton States in Monolayer WSe2
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DOI：
10.1103/physrevlett.129.076801
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发表时间：
2022-08-09
影响因子：
8.6
通讯作者：
Dery, Hanan
中科院分区：
文献类型：
--
作者：
Tuan, Dinh Van;Shi, Su-Fei;Dery, Hanan
在原型单层半导体WSe2中，导带中自旋极化的山谷(低能袋)的独特有序不仅允许研究简单的中性激子和带电激子(即三子)，而且还可以研究在较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WSe_2单分子膜的磁光测量，并将高电子掺杂时出现的谱线解释为六体激子态(“激子”)和八体激子态(“氧激子”)的光学跃迁。当光激发的电子-空穴对同时与多个费米海相互作用时，这些多体状态就会出现，每个费米海都有可区分的自旋和谷量子数。此外，我们还解释了暗三重子与光致发光光谱中激子的卫星光学跃迁之间的关系。
In the archetypal monolayer semiconductor WSe2, 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 WSe2 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 distinguish-able spin and valley quantum numbers. In addition, we explain the relations between dark trions and satellite optical transitions of hexcitons in the photoluminescence spectrum.