Dynamics of Electrons at Intersubband Excitation in Asymmetric Tunnel-Coupled Quantum Well Structure
Abstract
We present investigations of the intersubband electron dynamics in asymmetric tunnel-coupled GaAs/AlGaAs quantum wells. The study is performed by time resolved pump and probe experiments. Temporal evolution of the bleaching signals has biexponential behaviour. In addition to the time of the relaxation into the ground state with LO-phonon emission a second long decay time depending on transition energy and temperature is observed. We associate the second recovery time with transitions between confined F-state of quantum wells and states in the barriers including Xz-states which appear due to high content of Al. The influence of the transitions between subbands with energy separation less than optical phonon energy on the relaxation processes is also discussed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2001
- Accession Number
- ADP013180
Entities
People
- A. Seilmeier
- D. A. Firsov
- E. A. Zibik
- L. E. Vorobjev
- S. R. Schmidt
Organizations
- Peter the Great Saint Petersburg State Polytechnical University