Abstract
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.
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