科研之友
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摘要
We study the negatively charged exciton trion in stacked quantum dots by the configuration interaction method. We discuss the trion recombination spectrum in an external electric field (F) and look for the effects of the valence band mixing leading to the antibonding-hole ground-state formation in the quantum dot molecule. We find that the antibonding-hole ground state produces a distinct modification of the trion emission for strongly coupled dots inverting the intensities of recombination lines in the principal avoided crossing appearing in the spectrum within the range of low F. This avoided crossing is very similar to the one observed for the neutral exciton only with a shift of the anticrossing centra on the scale of F. The exciton and trion emission spectra are distinctly different for weak interdot tunnel coupling, for which the effects of the antibonding-hole ground state are less evident for both the exciton and the trion. In particular for both the bonding and the antibonding-hole ground states the dissociation of the negative trion ground state appears as a two-stage process with a characteristic shape of the recombination line as observed experimentally.
- 出版日期2012-2-3
