Abstract
We propose a procedure to solve exactly the Schrödinger equationfor a biexciton composed of two electrons and two holes in a harmonicquantum dot by using the hyperspherical coordinates. The binding energy ofthe ground state has been obtained as a function of the electron-hole massratio. Dependence of the ratio of the binding energy of a biexciton to thatof a exciton on the mass ratio in a quantum dot has been obtained.
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