Composite excitonic states in doped semiconductors

We present a theoretical model of composite excitonic states in doped semiconductors [1]. Many-body interactions between a photoexcited electron-hole pair and the electron gas are integrated into a computationally tractable few-body problem, solved by the variational method [2,3]. We focus on electron-doped monolayer (ML)-MoSe2 and ML-WSe2 due to the contrasting character of their conduction bands [4]. In both cases, the core of the composite is a tightly bound trion (two electrons and a valence-band hole) surrounded by a region depleted of electrons. The composite in ML-WSe2 further includes a satellite electron with different quantum numbers [1,5]. The theory is general and can be applied to semiconductors with various energy-band properties, allowing one to calculate their excitonic states and to quantify the interaction with the Fermi sea.



[1] Dinh Van Tuan and Hanan Dery, Phys. Rev. B 106, L081301 (2022).

[2] Dinh Van Tuan and Hanan Dery, arXiv:2022.08378.

[3] Dinh Van Tuan and Hanan Dery, arXiv:2022.08379.

[4] Dinh Van Tuan et. al., Phys. Rev. B 99, 085301 (2019)

[5] Dinh Van Tuan et. al., Phys. Rev. Lett. 129, 076801 (2022)