Excitons and trions with negative effective masses in two-dimensional semiconductors
arXiv:2301.11672 · doi:10.1093/oxfmat/itad004
Abstract
We study theoretically fundamental Coulomb-correlated complexes: neutral and charged excitons, also known as trions, in transition metal dichalogenides monolayers. We focus on the situation where one of the electrons occupies excited, high-lying, conduction band characterized by a negative effective mass. We develop the theory of such high-lying excitons and trions with negative effective mass and demonstrate the key role of the non-parabolicity of the high-lying conduction band dispersion in formation of the bound exciton and trion states. We present simple, accurate and physically justified trial wavefunctions for calculating the binding energies of Coulomb-bound complexes and compare the results of variational calculations with those of a fully numerical approach. Within the developed model we discuss recent experimental results on observation of high-lying negative effective mass trions [K.-Q. Lin et al., Nat. Commun. 13, 6980 (2022)].
10 pages, 7 figures
References in corpus (10)
- Asymmetry gap in the electronic band structure of bilayer graphene
- k.p theory for two-dimensional transition metal dichalcogenide semiconductors
- Giant Rydberg Excitons in Cuprous Oxide
- Valley Phonons and Exciton Complexes in a Monolayer Semiconductor
- Realization of an atomically thin mirror using monolayer MoSe2
- Three-particle Complexes in Two-Dimensional Semiconductors
- Observation of high angular momentum excitons in cuprous oxide
- Electron-exciton interactions in the exciton-polaron problem
- Excitons and trions in monolayer transition metal dichalcogenides: A comparative study between the multiband model and the quadratic single-band model
- Effect of fermion indistinguishability on optical absorption of doped two-dimensional semiconductors