Скачать полную версию статьи (в PDF формате)

В. И. Сугаков, В. В. Томилко*, А. А. Чернюк
«Пространственное распределение экситонных конденсированных фаз в полупроводниковых квантовых ямах во внешних полях. »
013–021 (2011)

PACS numbers: 03.75.Hh, 03.75.Nt, 71.35.Lk, 73.21.Fg, 78.67.De

Conditions of formation and properties of structures in spa-tial dependence of indirect-exciton density in double quantum wells in semiconductors are investigated in cases of: 1) the modulation by spatially periodic electrostatic field and 2) the presence of external harmonic potential for excitons. The simulations show that, in case 1 at small values of the pump-ing, the distribution consists of periodically located shafts. At pumpings, which are higher than the threshold value, besides periodic dependence in density distribution caused by the field, the stratification of shafts of the exciton density into separate islands of the exciton-condensed phase appears in the transversal direction. Islands appearance is caused by both the appearance of the exciton condensed phase and the inhomogeneity of a system due to finite exciton lifetime and pumping presence. In case 2, the exciton distribution is placed in the form of concentric circles, which are broken into separate islands of the condensed excitons. With increasing pumping intensity, the structure takes form of solid circles. The dependence of appeared structures on the parameters (potential depth, modulation period etc.) is revealed.