Vertical transport in all-binary GaAs/AlAs short-period superlattices and carrier trapping and detrapping dynamics by different quantum wells
| Autor: | L. Schrottke, R. Hey, Kenzo Fujiwara, Holger T. Grahn, Akihiro Satake |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Condensed Matter::Quantum Gases
73.21.Cd education.field_of_study Photoluminescence Phonon scattering Condensed matter physics Condensed Matter::Other Phonon Chemistry Superlattice Exciton Population 78.47.+p 78.55.Cr Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics 78.67.Pt Electronic Optical and Magnetic Materials Condensed Matter::Materials Science 78.66.Fd 73.50.Gr education Quantum tunnelling Quantum well |
| Zdroj: | physica status solidi (b). 244:2926-2935 |
| ISSN: | 1521-3951 0370-1972 |
| DOI: | 10.1002/pssb.200675617 |
| Popis: | Dynamics of vertical transport in all-binary GaAs/AlAs short-period superlattices (SPSs) have been investigated as a function of temperature by steady-state and time-resolved photoluminescence (PL) experiments. When two different, enlarged quantum wells are embedded in the SPSs, photoexcited carriers compete to be trapped into various localized exciton states and a variety of exciton radiative recombination dynamics appears accompanied by phonon heating. Redistribution of carrier population in the different wells by phonon scattering is significantly influenced by vertical miniband transport in the SPSs. Three different transport regimes are pointed out: (i) tunnelling transport affected by irreversible carrier cooling into deep localized states, (ii) interplay of carrier relaxation and phonon-assisted activation mediated by an efficient miniband Bloch transport, and (iii) thermalization processes. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text