Electron recoil effect in electrically tunable MoSe2 monolayers

Abstract

Radiative recombination of excitons dressed by the interactions with free charge carriers often occurs under simultaneous excitation of either electrons or holes to unbound states. This phenomenon, known as the electron recoil effect, manifests itself in pronounced, asymmetric spectral lineshapes of the resulting emission. We study the electron recoil effect experimentally in electrically-tunable monolayer semiconductors and derive it theoretically using both trion and Fermi-polaron pictures. Time-resolved analysis of the recoil lineshapes is employed to access transient, non-equilibrium states of the exciton-carrier complexes. We demonstrate cooling of the initially overheated populations on the picosecond timescales and reveal the impact of lattice temperature and free carrier density. Both thermally activated phonons and the presence of free charges are shown to accelerate equilibration. Finally, we find strong correlations between relaxation times from recoil analysis and luminescence rise times, providing a consistent interpretation for the initial dynamics of trion/Fermi-polaron states.

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Cited by in corpus (12)

• Exciton optics, dynamics and transport in atomically thin semiconductors
• Trion photoluminescence and trion stability in atomically thin semiconductors
• Crossover from exciton polarons to trions in doped two-dimensional semiconductors at finite temperature
• Superconductivity induced by strong electron-exciton coupling in doped atomically thin semiconductor heterostructures
• Exact Quantum Virial Expansion for the Optical Response of Doped Two-Dimensional Semiconductors
• Electrically tunable layer-hybridized trions in doped WSe${}_2$ bilayers
• Longitudinal-transverse splitting and fine structure of Fermi polarons in two-dimensional semiconductors
• Momentum-dependent quasiparticle properties of the Fermi polaron from the functional renormalization group
• Terahertz radiation induced attractive-repulsive Fermi polaron conversion in transition metal dichalcogenide monolayers
• Optical properties of Fermi polarons in a GaInP/MoSe2 monolayer heterostructure
• Effect of spin-dependent tunneling and intervalley scattering in magnetic-semiconductor van der Waals heterostructures on exciton and trion polarization
• Trion-phonon interaction in atomically thin semiconductors