Electric-field switching of exciton spin splitting in coupled quantum dots

Details Electric-field switching of exciton spin splitting in coupled quantum dots Electric-field switching of exciton spin splitting in coupled quantum dots

2008-06-12

arxiv.org/abs/0806.1994v1

Physics

Condensed Matter

Materials Science

3 pages, 5 figures. to appear in Appl. Phys. Lett

Scientific paper

10.1063/1.2952509

We investigate theoretically the spin splitting of the exciton states in semiconductor coupled quantum dots (CQDs) containing a single magnetic ion. We find that the spin splitting can be switched on/off in the CQDs \textit{via} the \textit{sp-d}exchange interaction using the electric field. An interesting bright-to-dark exciton transition can be found and significantly affects the photoluminescence spectrum. This phenonmenon is induced by the transition of the ground exciton state, arising from the hole mixing effect, between the bonding and antibonding states.

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