Biexciton and spin dephasing effects in quantum dots embedded in a glass matrix proved by four-wave mixing and pump-and-probe spectroscopy

V. D. Kulakovskii, K. Babocsi, M. Schmitt, N. A. Gippius, W. Kiefer

Результат исследований: Вклад в журналСтатьярецензирование

7 Цитирования (Scopus)

Аннотация

The polarization properties of time-integrated four-wave mixing (FWM) and pump-and-probe transmission (PPT) signal spectroscopy were investigated for a system of excitons confined in CdSSe quantum dots (QD's) embedded in a glass matrix. A strong FWM signal was observed by scattering σ- circularly polarized light on the population grating created by two σ+ pulses (forbidden geometry according to the noninteracting oscillator's model). A similar depolarization effect is observed in the PPT studies: the difference in the signals in the σ+ σ+ and σ+ σ- geometries decays for delay times of about 5 ps. No marked scattering is observed if the population grating is created by two pulses of opposite (σ+ and σ-) polarizations. We demonstrate that these facts are associated to a strong exciton-exciton coupling in the QD and to the inhomogeneous spin dephasing of the QD excitons due to a random exchange splitting of the J = 1 exciton state, originating from the lowered QD symmetry.

Язык оригиналаАнглийский
Номер статьи113303
Страницы (с-по)1133031-1133034
Число страниц4
ЖурналPhysical Review B - Condensed Matter and Materials Physics
Том67
Номер выпуска11
DOI
СостояниеОпубликовано - мар. 2003
Опубликовано для внешнего пользованияДа

Fingerprint

Подробные сведения о темах исследования «Biexciton and spin dephasing effects in quantum dots embedded in a glass matrix proved by four-wave mixing and pump-and-probe spectroscopy». Вместе они формируют уникальный семантический отпечаток (fingerprint).

Цитировать