Field-modified photoluminescence spectra in coupled quantum dots

Jia-Lin Zhu; Weidong Chu; Dong Xu; Zhensheng Dai
December 2005
Applied Physics Letters;12/26/2005, Vol. 87 Issue 26, p263113
Academic Journal
Photoluminescence spectra of an exciton in coupled quantum dots under an electric field have been calculated and investigated, and it has been compared with a recent experiment. For coupled quantum dots, the four s-shell exciton states are dramatically affected by the electric field and the symmetry of the two dots. The electric field can induce anticrossings in the spectra, which are remarkably influenced by the differences between the two dots. The field-modified photoluminescence spectra can be used in the experiment to determine whether the two dots are identical and to obtain some information about electronic and structural parameters of coupled quantum dots.


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