Trion photoluminescence and trion stability in atomically thin semiconductors

Abstract

The optical response of doped monolayer semiconductors is governed by trions, i.e. photoexcited electron-hole pairs bound to doping charges. While their photoluminescence (PL) signatures have been identified in experiments, a microscopic model consistently capturing bright and dark trion peaks is still lacking. In this work, we derive a generalized trion PL formula on a quantum-mechanical footing, considering direct and phonon-assisted recombination mechanisms. We show the trion energy landscape in WSe${}_2$ by solving the trion Schrödinger equation. We reveal that the mass imbalance between equal charges results in less stable trions exhibiting a small binding energy and, interestingly, a large energetic offset from exciton peaks in PL spectra. Furthermore, we compute the temperature-dependent PL spectra for n- and p-doped monolayers and predict yet unobserved signatures originating from trions with an electron at the $\Lambda$ point. Our work presents an important step towards a microscopic understanding of the internal structure of trions determining their stability and optical fingerprint.

References in corpus (37)

• Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
• Observation of tightly bound trions in monolayer MoS2
• Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2
• Excitons in atomically thin transition metal dichalcogenides
• Observation of giant bandgap renormalization and excitonic effects in a monolayer transition metal dichalcogenide semiconductor
• Electrical Control of Two-Dimensional Neutral and Charged Excitons in a Monolayer Semiconductor
• First-principles study of the phonon-limited mobility in n-type single-layer MoS2
• Tightly bound excitons in monolayer WSe2
• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Theory of Neutral and Charged Excitons in Monolayer Transition Metal Dichalcogenides
• Quasiparticle band structures and optical properties of strained monolayer MoS2 and WS2
• Exciton physics and device application of two-dimensional transition metal dichalcogenide semiconductors
• Fermi polaron-polaritons in charge-tunable atomically thin semiconductors
• Excitonic linewidth and coherence lifetime in monolayer transition metal dichalcogenides
• Intrinsic Transport Properties of Electrons and Holes in Monolayer Transition Metal Dichalcogenides
• In-plane Propagation of Light in Transition Metal Dichalcogenide Monolayers: Optical Selection Rules
• Bright excitons in monolayer transition metal dichalcogenides: from Dirac cones to Dirac saddle points
• Charged excitons in monolayer WSe${}_2$: experiment and theory
• Directly visualizing the momentum forbidden dark excitons and their dynamics in atomically thin semiconductors
• Many-Body Theory of Trion Absorption Features in Two-Dimensional Semiconductors
• Valley Phonons and Exciton Complexes in a Monolayer Semiconductor
• Phonon-assisted Photoluminescence from Dark Excitons in Monolayers of Transition Metal Dichalcogenides
• Gate tunable dark trions in monolayer WSe${}_2$
• Exciton diffusion in monolayer semiconductors with suppressed disorder
• Optical properties of charged excitons in two-dimensional semiconductors
• Momentum-Dark Intervalley Exciton in Monolayer Tungsten Diselenide Brightened via Chiral Phonon
• Interacting Polaron-Polaritons
• Momentum-resolved observation of exciton formation dynamics in monolayer WS${}_2$
• Theory of exciton-electron scattering in atomically thin semiconductors
• Direct Observation of Gate Tunable Dark Trions in Monolayer WSe2
• Multipath optical recombination of intervalley dark excitons and trions in monolayer WSe${}_2$
• Exciton optics, dynamics and transport in atomically thin semiconductors
• Intrinsic Lifetime of Higher Excitonic States in Tungsten Diselenide Monolayers
• Dark trions govern the temperature-dependent optical absorption and emission of doped atomically thin semiconductors
• Relaxation and darkening of excitonic complexes in electrostatically-doped monolayer semiconductors: Roles of exciton-electron and trion-electron interactions
• Temporal evolution of low-temperature phonon sidebands in WSe${}_2$ monolayers
• Electron recoil effect in electrically tunable MoSe2 monolayers

Cited by in corpus (4)

• Probing excitons with time-resolved momentum microscopy
• Electrically tunable layer-hybridized trions in doped WSe${}_2$ bilayers
• Impact of an electron Wigner crystal on exciton propagation
• Brightening dark excitons and trions in systems with a Mexican-hat energy dispersion: example of InSe