Resonant spectroscopy of individual CdSe Quantum Dots containing single Mn~(2+) ions in (Zn,Cd)Se barrier

摘要

Spectroscopy of individual CdSe Quantum Dots embedded in an innovative type Zn_(1-x)Cd_xSe (x_(Cd) of up to 0.3) barrier of lower energy than a typical ZnSe one, is reported. A polarization transfer efficiency of up to -26.1% for the Quantum Dot without a Mn~(2+) ion and optical addressing of the QD embedding a single Mn~(2+) ion using a quasi-resonant excitation is demonstrated. Thanks to a shifting of QD emission energy below Mn~(2+) intraionic transition, operation of the studied QDs doped with several Mn~(2+) ions should be feasible without a loss of the QD quantum yield. This is beneficial for implementation of the presented Quantum Dots in magnetooptical devices operating in the visible spectral range.