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- Title
Excitons and trions with negative effective masses in two-dimensional semiconductors.
- Authors
Semina, Marina A; Mamedov, Javid V; Glazov, Mikhail M
- Abstract
We study theoretically fundamental Coulomb-correlated complexes: neutral and charged excitons, also known as trions, in transition metal dichalcogenides monolayers. We focus on the situation where one of the electrons occupies an 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 the 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 the observation of high-lying negative effective mass trions.
- Subjects
MATERIALS science; EXCITON theory; WAVE functions; EFFECTIVE mass (Physics); TRANSITION metals
- Publication
Oxford Open Materials Science, 2024, Vol 3, Issue 1, p1
- ISSN
2633-6979
- Publication type
Article
- DOI
10.1093/oxfmat/itad004