Optically detected resonance spectroscopy of interface fluctuation quantum dots
| Autor: | Alexander B. Dzyubenko, A. S. Bracker, C. J. Meining, Joseph G. Tischler, Athos Petrou, V. R. Whiteside, B. D. McCombe, D. Gammon |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Free electron model
Materials science Photoluminescence Condensed Matter::Other Cyclotron resonance Resonance Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Magnetic field Quantum dot Atomic physics Spectroscopy Quantum well |
| Zdroj: | Physica E: Low-dimensional Systems and Nanostructures. 26:158-162 |
| ISSN: | 1386-9477 |
| Popis: | We have performed optically detected resonance (ODR) spectroscopy on modulation-doped GaAs/AlGaAs quantum wells of different widths in which lateral fluctuations of the well width were purposely introduced by growth interruption at the interfaces. These monolayer fluctuations form quantum dots for which confinement and Coulomb correlation energies are comparable. By monitoring resonant changes of the dot ensemble photoluminescence induced by far-infrared (FIR) radiation in a magnetic field, we have observed cyclotron resonance (CR) of free electrons in the widest wells, as well as internal transitions of mobile and localized charged excitons. The latter, which are forbidden by magnetic translational invariance, have previously not been observed. For the narrower wells the effects of non-parabolicity and carrier localization on the CR and CR-like transitions have to be included for a proper interpretation of the measurements. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect