Zeeman Effect in Parabolic Quantum Dots

Magneto-optical properties of strain-inducedInxGa1−xAsparabolic quantum dots

“…All samples exhibit the lifting of degeneracy of the excited states ͑Zeeman effect͒, whereas the 1⌺ state (mϭ0) does show only the usual diamagnetic shift. In a previous work, 6 we have already shown that the observed Zeeman splitting and diamagnetic shift can be quite satisfactorily described by a single-particle model, in the two band approximation. The Zeeman effect term is expected to increase linearly in the field 20 as…”

“…4,5 This effect is similar to the Zeeman splitting occurring in the electronic states of real atoms, thus reinforcing the analogy between quantum dots and atoms. 6 Although this finding is quite clear in itself, the actual description of the magnetic interactions in mesoscopic systems is still unclear. Unlike the case of real atoms, quantum dots can be realized by different methods, namely, direct patterning of heterostructures, self-organization, and fieldeffect confinement, so that only electrons or both electrons and holes can be confined in the structure.…”

Effects of few-particle interaction on the atomiclike levels of a single strain-induced quantum dot

“…This system has never been investigated by local spectroscopy so far, but for an intriguing nearfield luminescence experiment in which no atomiclike features were observed, 11 despite the excellent zerodimensional characteristics shown recently by the same samples. 2,[12][13][14] The photoluminescence ͑PL͒ of the single dot is measured with increasing the number of e-h pairs, ranging from 1 to approximately 20. At low injection powers, corresponding to an average number of only a few e-h pairs, we do observe the appearance of correlated exciton lines, associated with the formation of biexcitons, on the low-energy side of the ground level transition.…”

“…To isolate a single dot, a square window of 10ϫ10 m 2 was first opened into a gold mask deposited on the sample surface by UV lithography and liftoff. Then a 200ϫ200 nm 2 and detected by a charge-coupled device ͑CCD͒ mounted on a 0.32 m spectrometer. In order to probe the effects of sample heating, different measurements were performed by reducing the average laser power by means of a mechanical chopper.…”

Red luminescence from strain-induced GaInP quantum dots

“…5 Calculated strain distribution, confinement potential, and energy levels in the structure corresponded well with the measured PL spectra. 6 Also time-resolved PL 7 and magnetoluminescence 8 measurements were performed on the GaInAs QDs. The formation of InP islands on GaAs and GaInP layers by coherent Stranski-Krastanow growth mode 9 has been investigated in several reports.…”