Biexciton Formation in the Nonadiabatic Mutual-Polarization Mechanism(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

概要

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By implementing diffusion Monte Carlo simulations as well as analyzing nonadiabatic processes perturbatively, we have made a detailed study of the properties of the ground state in a four-body Coulomb system (M^+M^+m^-m^-) or a system composed of two holes and two electrons in an isotropic semiconductor with the mass ratio m/M in the range from 0.22 to 4.55 in which the adiabatic approximation cannot afford a bound state. We find that the attraction between M^+ particles induced by the nonadiabatic polarization of m^- particles (and vice versa) is strong enough to bring about the bound ground state. On this basis, we propose the nonadiabatic mutual-polarization mechanism for biexciton formation.
2009-03-15