Exciton-exciton interaction in transition metal dichalcogenide monolayers and van der Waals heterostructures

Abstract

Due to a strong Coulomb interaction, excitons dominate the excitation kinetics in 2D materials. While Coulomb-scattering between electrons has been well studied, the interaction of excitons is more challenging and remains to be explored. As neutral composite bosons consisting of electrons and holes, excitons show a non-trivial scattering dynamics. Here, we study on microscopic footing exciton-exciton interaction in transition-metal dichalcogenides and related van der Waals heterostructures. We demonstrate that the crucial criterion for efficient scattering is a large electron/hole mass asymmetry giving rise to internal charge inhomogeneities of excitons and emphasizing their cobosonic substructure. Furthermore, both exchange and direct exciton-exciton interactions are boosted by enhanced exciton Bohr radii. We also predict an unexpected temperature dependence that is usually associated to phonon-driven scattering and we reveal an orders of magnitude stronger interaction of interlayer excitons due to their permanent dipole moment. The developed approach can be generalized to arbitrary material systems and will help to study strongly correlated exciton systems, such as moire super lattices.

arXiv comment13 pages, 6 figures

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• Exciton optics, dynamics and transport in atomically thin semiconductors
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• Dark exciton-exciton annihilation in monolayer WSe${}_2$
• Phonon-assisted inter-valley scattering determines ultrafast exciton dynamics in MoSe${}_2$ bilayers
• Microscopic origin of anomalous interlayer exciton transport in van der Waals heterostructures
• Highly Tunable Ground and Excited State Excitonic Dipoles in Multilayer 2H-MoSe${}_2$
• Interaction-driven transport of dark excitons in 2D semiconductors with phonon-mediated optical readout
• Quantum theory of two-dimensional materials coupled to electromagnetic resonators
• Stochastic scattering theory for excitation induced dephasing: Time-dependent nonlinear coherent exciton lineshapes
• Signatures of electric field and layer separation effects on the spin-valley physics of MoSe${}_2$/WSe${}_2$ heterobilayers: from energy bands to dipolar excitons
• Electrically tunable dipolar interactions between layer-hybridized excitons
• Capacitively-coupled and inductively-coupled excitons in bilayer MoS${}_2$
• A comprehensive study of complex non-adiabatic exciton dynamics in MoSi${}_2$N${}_4$
• Trion-trion annihilation in monolayer WS${}_2$
• Exciton-exciton and exciton-charge carrier interaction and the exciton collisional broadening in GaAs/AlGaAs quantum wells
• Confined-state physics and signs of fermionization of moiré excitons in WSe${}_2$/MoSe${}_2$ heterobilayers
• Optical Signatures of Moiré Trapped Biexcitons
• Exciton-exciton Interaction in Monolayer MoSe${}_2$ from Mutual Screening of Coulomb Binding
• Interlayer exciton polaritons in homobilayers of transition metal dichalcogenides
• Magnetically tunable exciton valley coherence in monolayer WS${}_2$ mediated by the electron-hole exchange and exciton-phonon interactions
• Excitonic Bloch equations from first principles
• Effect of photoinduced screening on the spectroscopic signature of exciton-phonon coupling
• Electrostatic control of nonlinear photonic-crystal polaritons in a monolayer semiconductor
• Valley-exchange coupling probed by angle-resolved photoluminescence
• Searching for Unconventional Superfluid in Excitons of Monolayer Semiconductors
• Viscous hydrodynamics of excitons in van der Waals heterostructures
• Rydberg excitons and polaritons in monolayer transition metal dichalcogenides in a magnetic field
• Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides
• Exciton-exciton Interactions -- A Quantitative Comparison Between Complimentary Phenomenological Models
• Stochastic exciton-scattering theory of optical lineshapes: Renormalized many-body contributions
• Striped excitonic (super)solid in anisotropic semiconductors with screened exciton interactions
• Valley-controlled many-body exciton interactions in monolayer WSe${}_2$ phototransistors
• Effective long-range attraction of moiré excitons under the influence of atomic reconstructions and anisotropic screening
• Supermoiré-trapped quadrupolar exciton