Exciton-phonon relaxation bottleneck and radiative decay of thermal exciton reservoir in two-dimensional materials

Abstract

We study exciton radiative decay in a two-dimensional material, taking into account large thermal population in the non-radiative states, from which excitons are scattered into the radiative states by acoustic phonons. We find an analytical solution of the kinetic equation for the non-equilibrium distribution function of excitons in the radiative states. Our estimates for bright excitons in transition metal dichalcogenides indicate a strong depletion of radiative state population due to insufficient exciton-phonon scattering rate at low temperatures.

8 pages, 4 figures

References in corpus (8)

• Observation of giant bandgap renormalization and excitonic effects in a monolayer transition metal dichalcogenide semiconductor
• Tightly bound excitons in monolayer WSe2
• Probing Excitonic Dark States in Single-layer Tungsten Disulfide
• Excitonic linewidth and coherence lifetime in monolayer transition metal dichalcogenides
• Exciton Radiative Lifetime in Transition Metal Dichalcogenide Monolayers
• Intrinsic Transport Properties of Electrons and Holes in Monolayer Transition Metal Dichalcogenides
• Spin-flip processes and radiative decay of dark intravalley excitons in transition metal dichalcogenide monolayers
• Radiatively limited dephasing and exciton dynamics in MoSe${}_2$ monolayers

Cited by in corpus (12)

• Excitons in atomically thin transition metal dichalcogenides
• Enabling valley selective exciton scattering in monolayer WSe${}_2$ through upconversion
• Exciton-phonon coupling in MoSe2 monolayers
• Strongly coupled coherent phonons in single-layer MoS${}_2$
• Exciton states in monolayer MoSe2 and MoTe2 probed by upconversion spectroscopy
• Phonon wind and drag of excitons in monolayer semiconductors
• Quantum interference effect on exciton transport in monolayer semiconductors
• Radiative lifetime of localized excitons in transition metal dichalcogenides
• Exciton fine structure splitting and linearly polarized emission in strained transition-metal dichalcogenide monolayers
• Many-body theory of radiative lifetimes of exciton-trion superposition states in doped two-dimensional materials
• Mean field study of 2D quasiparticle condensate formation in presence of strong decay
• Coherence and de-coherence in the Time-Resolved ARPES of realistic materials: an ab-initio perspective