| Автор | Z X Jiang |
| Автор | S R Ryu |
| Автор | B D McCombe |
| Дата выпуска | 1996-11-01 |
| dc.description | Results of recent far-infrared magnetospectroscopic studies of a series of GaAs/AlGaAs multiple-quantum-well samples with Si donors -doped both in the 20 nm well centres and in the 60 nm barrier centres are described. In the presence of excess electrons a strong singlet transition of the ions is observed, and one of the two predicted triplet transitions has been identified. At higher electron densities these transitions evolve continuously into blue-shifted singlet-like and triplet-like bound magnetoplasmon transitions. For the two highest-density samples the singlet-like transition exhibits clear discontinuous changes in slope versus field at integral Landau level filling factors (FFs). Plots of the difference in energy between the many-electron singlet-like transition and the singlet transition normalized by the high-field Coulomb energy versus FF, exhibit cusp-like behaviour at FFs 1 and 2 at 4.2 K for the highest density sample, and at 1 and 4/3 at 1.7 K for the lower density sample. The results at integral FFs are compared with recent theoretical calculations. These experiments indicate that controlled doping of a random array of donor ions can be used to probe the nature of many-electron states in confined systems. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Effect of donor impurities on far-infrared magnetospectroscopy of electrons in quasi-two-dimensional systems |
| Тип | paper |
| DOI | 10.1088/0268-1242/11/11S/027 |
| Electronic ISSN | 1361-6641 |
| Print ISSN | 0268-1242 |
| Журнал | Semiconductor Science and Technology |
| Том | 11 |
| Первая страница | 1608 |
| Последняя страница | 1612 |
| Аффилиация | Z X Jiang; Department of Physics, SUNY at Buffalo, Buffalo, NY 14260, USA |
| Аффилиация | S R Ryu; Department of Physics, SUNY at Buffalo, Buffalo, NY 14260, USA |
| Аффилиация | B D McCombe; Department of Physics, SUNY at Buffalo, Buffalo, NY 14260, USA |
| Выпуск | 11S |
