Complexes of dipolar excitons in layered quasi-two-dimensional nanostructures

Abstract

We discuss neutral and charged complexes (biexciton and trion) formed by indirect excitons in layered quasi-two-dimensional semiconductor heterostructures. Indirect excitons -- long-lived neutral Coulomb-bound pairs of electrons and holes of different layers -- have been known for semiconductor coupled quantum wells and are recently reported for van der Waals heterostructures such as bilayer graphene and transition metal dichalcogenides. Using the configuration space approach, we derive the analytical expressions for the trion and biexciton binding energies as functions of the interlayer distance. The method captures essential kinematics of complex formation to reveal significant binding energies, up to a few tens of meV for typical interlayer distances ~3-5 A, with the trion binding energy always being greater than that of the biexciton. Our results can contribute to the understanding of more complex many-body phenomena such as exciton Bose-Einstein condensation and Wigner-like electron-hole crystallization in layered semiconductor heterostructures.

10 pages, 4 figures, 105 references. arXiv admin note: text overlap with arXiv:1605.02348

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Cited by in corpus (10)

• Electrical control of interlayer exciton dynamics in atomically thin heterostructures
• Discrete Interactions between a few Interlayer Excitons Trapped at a MoSe${}_2$-WSe${}_2$ Heterointerface
• Localized bright luminescence of indirect excitons and trions in MoSe${}_2$/WSe${}_2$ van der Waals heterostructure
• Few-body systems in condensed matter physics
• Broadband pump-probe study of biexcitons in chemically exfoliated layered WS${}_2$
• Crystal Phases of Charged Interlayer Excitons in van der Waals Heterostructures
• ZnPSe${}_3$ as ultrabright indirect bandgap system with microsecond excitonic lifetimes
• Controlling Single-Photon Emission with Ultrathin Transdimensional Plasmonic Films
• Magnetic-Field-Induced Wigner Crystallization of Charged Interlayer Excitons in van der Waals Heterostructures
• Dipolar polaritons squeezed at unitarity