Abstract
The set of eigenequations for determining the energy levels and wave functions of Wannier excitons in a semiconductor quantum well form a matrix equation labeled by the subband indices of the quantum well. The nondiagonal matrix elements of the electron-hole Coulomb interaction give rise to the quantum subband interference effect between excitons of different subband branches. We solve this coupled matrix eigenequation by an accurate numerical method. The calculated values of exciton binding energies are significantly enhanced by including this effect.
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