Electrostatic control of the trion fine structure in transition metal dichalcogenide monolayers

Abstract

Charged excitons (trions) are essential for the optical spectra in low dimensional doped monolayers (ML) of transitional metal dichalcogenides (TMDC). Using a direct diagonalization of the three-body Hamiltonian, we explore the low-lying trion states in four types of TMDC MLs. We show that the trions fine structure results from the interplay between the spin-valley fine structure of the single-particle bands and the exchange interaction between the composing particles. We demonstrate that by variations of the doping and dielectric environment, trion energy fine structure can be tuned, leading to anti-crossing of the bright and dark states with substantial implications for the optical spectra of TMDC MLs.

References in corpus (11)

• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Trion induced negative photoconductivity in monolayer MoS2
• Many-Body Theory of Trion Absorption Features in Two-Dimensional Semiconductors
• Proximity effects in bilayer graphene on monolayer WSe${}_2$: Field-effect spin-valley locking, spin-orbit valve, and spin transistor
• Excitonic valley effects in monolayer WS${}_2$ under high magnetic fields
• Environmentally-Sensitive Theory of Electronic and Optical Transitions in Atomically-Thin Semiconductors
• Diffusion quantum Monte Carlo study of excitonic complexes in two-dimensional transition-metal dichalcogenides
• Three-particle Complexes in Two-Dimensional Semiconductors
• Spin-Valley Locking Effect in Defect States of Monolayer MoS${}_2$
• Excitonic complexes in $n$-doped WS${}_2$ monolayer
• Light-matter coupling and non-equilibrium dynamics of exchange-split trions in monolayer WS2

Cited by in corpus (3)

• Strain control of exciton and trion spin-valley dynamics in monolayer transition metal dichalcogenides
• Microscopic theory of exciton and trion polaritons in doped monolayers of transition metal dichalcogenides
• Photonics in Flatland: Challenges and Opportunities for Nanophotonics with 2D Semiconductors