The biexciton binding energy in spherical CdSe/ZnSe quantum dots is calculated variationally in the framework of kp-perturbation theory. Smooth and abrupt confining potentials with the same localization area of carriers are compared for two limiting cases of light hole to heavy hole mass ratio beta=m_lh/m_hh: beta=1 and beta= 0. Accounting for correlations between carriers results in their polarized configuration and significantly increases the biexciton binding energy in comparison with the first order perturbation theory. For beta= 0 in smooth confining potentials there are three nearby biexciton states separated by small energy gap between 1S_3/2 and 1P_3/2 hole states. Acknowledgement The work was supported by Russian Science Foundation (Project number 14-22-00107).

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Дата начала обработки статистических данных - 27 января 2016 г.