Composite excitonic states in doped semiconductors

Abstract

We present a theoretical model of composite excitonic states in doped semiconductors. 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. We focus on electron-doped ML-MoSe${}_2$ and ML-WSe${}_2$ due to the contrasting character of their conduction bands. In both cases, the core of the composite is a tightly-bound trion (two electrons and valence-band hole), surrounded by a region depleted of electrons. The composite in ML-WSe${}_2$ further includes a satellite electron with different quantum numbers. 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.

References in corpus (12)

• Valley polarization in MoS2 monolayers by optical pumping
• Many-Body Theory of Trion Absorption Features in Two-Dimensional Semiconductors
• Radiofrequency spectroscopy of a strongly interacting two-dimensional Fermi gas
• Probing the spin-polarized electronic band structure in monolayer transition metal dichalcogenides by optical spectroscopy
• Diffusion quantum Monte Carlo study of excitonic complexes in two-dimensional transition-metal dichalcogenides
• Excitons and trions in monolayer transition metal dichalcogenides: A comparative study between the multiband model and the quadratic single-band model
• Hexcitons and oxcitons in monolayer WSe${}_2$
• A Many-Body Theory of the Optical Conductivity of Excitons and Trions in Two-Dimensional Materials
• Relaxation and darkening of excitonic complexes in electrostatically-doped monolayer semiconductors: Roles of exciton-electron and trion-electron interactions
• Many-body theory of optical absorption in doped two-dimensional semiconductors
• Many-body exciton and inter-valley correlations in heavily electron-doped WSe${}_2$ monolayers
• Fermi-edge singularity in the vicinity of the resonant scattering condition

Cited by in corpus (11)

• Hexcitons and oxcitons in monolayer WSe${}_2$
• Quartet Superfluid in Two-dimensional Mass-imbalanced Fermi Mixtures
• Emergence of 6-particle "hexciton'' states in WS${}_2$ and MoSe${}_2$ monolayers
• Excitons and trions in monolayer semiconductors with correlated electrons
• Effects of dynamical dielectric screening on the excitonic spectrum of monolayer semiconductors
• Ten-valley excitonic complexes in charge-tunable monolayer WSe${}_2$
• Competing few-body correlations in ultracold Fermi polarons
• Excitons in periodic potentials
• Component exchange theory of trions
• Landau-level composition of bound exciton states in magnetic field
• Energy shifts and broadening of excitonic resonances in electrostatically-doped semiconductors