Electron-hole binding in a quantum-dot lattice: Excitonic oscillator strength

S. K. Lyo
Phys. Rev. B 72, 045322 – Published 13 July 2005

Abstract

We study the excitonic oscillator strength and energies arising from the binding of an electron and a hole interacting through an attractive potential in a tunnel-coupled quantum-dot lattice. The effect of interdot tunneling of the electron and the hole and their attraction on the exciton oscillator strength and exciton binding is evaluated in one-dimensional (1D) and two-dimensional (2D) lattices. For short-range interaction, we find that close packing of the quantum dots into a 2D lattice can result in a nearly abrupt loss of electron-hole binding and the oscillator strength in contrast with a 1D lattice, where the effect is gradual. Numerical application includes general electron-hole attraction in 1D lattices and on-site plus nearest-neighbor attraction in 2D lattices. The time-dependent behavior of the oscillator strength is also examined for 1D on-site attraction.

    • Received 18 January 2005

    DOI:https://doi.org/10.1103/PhysRevB.72.045322

    ©2005 American Physical Society

    Authors & Affiliations

    S. K. Lyo*

    • Sandia National Laboratories, Albuquerque, New Mexico 87185, USA and Korea Advanced Institute of Science and Technology (KAIST), Taejeon, South Korea

    • *Present address: Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.

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    Issue

    Vol. 72, Iss. 4 — 15 July 2005

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