Fast relaxation of photo-excited carriers in 2D transition metal dichalcogenides

Abstract

We predict a fast relaxation of photo-excited carriers in monolayer transition metal dichalcogenides (TMDCs), which is mediated by the emission of longitudinal optical (LO) phonons. By evaluating Born effective charges for $\mathrm{Mo}{\mathrm{S}}_2,\mathrm{MoS}{\mathrm{e}}_2,\mathrm{W}{\mathrm{S}}_2$, and $\mathrm{WS}{\mathrm{e}}_2$, we find that, due to the polar coupling of electrons with LO phonons, the relaxation times for hot electrons and holes are of the order of a few ps.

4 pages, 3 figures

References in corpus (8)

• Valley polarization in MoS2 monolayers by optical pumping
• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Electronic structures and theoretical modelling of two-dimensional group-VIB transition metal dichalcogenides
• Intrinsic Transport Properties of Electrons and Holes in Monolayer Transition Metal Dichalcogenides
• Robust optical emission polarization in MoS2 monolayers through selective valley excitation
• Polarization analysis of excitons in monolayer and bilayer transition-metal dichalcogenides
• Plasmon losses due to electron-phonon scattering: the case of graphene encapsulated in hexagonal Boron Nitride
• Three-particle Complexes in Two-Dimensional Semiconductors

Cited by in corpus (18)

• Two-dimensional Fröhlich interaction in transition-metal dichalcogenide monolayers: Theoretical modeling and first-principles calculations
• Exciton-phonon coupling in MoSe2 monolayers
• Optical properties of charged excitons in two-dimensional semiconductors
• Tuning the Fröhlich exciton-phonon scattering in monolayer MoS2
• Phonon-assisted oscillatory exciton dynamics in monolayer MoSe2
• Origin of the Counterintuitive Dynamic Charge in the Transition-Metal Dichalcogenides
• Piezoelectricity in two-dimensional materials: a comparative study between lattice dynamics and ab-initio calculations
• Hybrid k$\cdot$p tight-binding model for subbands and infrared intersubband optics in few-layer films of transition-metal dichalcogenides: MoS${}_2$, MoSe${}_2$, WS${}_2$ and WSe${}_2$
• Localized interlayer complexes in heterobilayer transition metal dichalcogenides
• Auger recombination of dark excitons in $\mathrm{W}{\mathrm{S}}_2$ and $\mathrm{WS}{\mathrm{e}}_2$ monolayers
• Virtual trions in the photoluminescence of monolayer transition-metal dichalcogenides
• Phonon-assisted exciton and trion conversion efficiency in transition metal Dichalcogenides
• Intervalley Polaron in Atomically Thin Transition Metal Dichalcogenides
• Vibrational and dielectric properties of monolayer transition metal dichalcogenides
• Carrier and Phonon Dynamics in Multilayer WSe2 captured by Extreme Ultraviolet Transient Absorption Spectroscopy
• Phenomenological model for long wavelength optical modes in transition-metal dichalcogenide monolayer
• Phase diagram of electron-hole liquid in monolayer heterostructures based on transition metal dichalcogenides
• Manipulating single photon emitter radiative lifetime in transition-metal dichalcogenides through Forster resonance energy transfer to graphene