Trion induced photoluminescence of a doped MoS2 monolayer

Abstract

We demonstrate that the temperature and doping dependencies of the photoluminescence (PL) spectra of a doped MoS2 monolayer have several peculiar characteristics defined by trion radiative decay. While only zero-momentum exciton states are coupled to light, radiative recombination of non-zero momentum trions is also allowed. This leads to an asymmetric broadening of the trion spectral peak and redshift of the emitted light with increasing temperature. The lowest energy trion state is dark, which is manifested by the sharply non-monotonic temperature dependence of the PL intensity. Our calculations combine the Dirac model for the single-particle states, the parameters for which are obtained from the first principle calculations, and the direct solution of the three-particle problem within the Tamm-Dancoff approximation. The numerical results are well captured by a simple model that yields analytical expressions for the temperature dependencies of the PL spectra.

arXiv comment10 pages, 6 figures

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• Substrate impact on the thickness dependence of vibrational and optical properties of large area $Mo{S}_2$ produced by gold-assisted exfoliation
• Electron recoil effect in electrically tunable MoSe2 monolayers
• Microscopic theory of exciton and trion polaritons in doped monolayers of transition metal dichalcogenides
• Crossover from exciton polarons to trions in doped two-dimensional semiconductors at finite temperature
• Variationally optimized orbital approach to trions in two-dimensional materials
• Probing Dark Excitons in Monolayer MoS${}_2$ by NonLinear Two-Photon Spectroscopy
• Tuning exciton recombination rates in doped transition metaldichalcogenides
• Nonlinear spectroscopy of excitonic states in transition metal dichalcogenides
• Trion formation resolves observed peak shifts in the optical spectra of transition metal dichalcogenides
• Imaging Seebeck drift of excitons and trions in MoSe2 monolayers
• Electrostatic control of the trion fine structure in transition metal dichalcogenide monolayers
• Semiclassical approach for excitonic spectrum of Coulomb coupling between two Dirac particles