Abstract
Landau-level lifetimes are determined from saturation cyclotron resonance (CR) in wide parabolic wells, quantum wells and bulk PbTe-Pb1 - xEuxTe systems. These narrow gap structures exhibit strong band non-parabolicity necessary to terminate the normally equi-spaced Landau-level ladder. It was not possible to saturate the bulk sample, but short lifetimes, of between 1.5 and 8 ps, were obtained for the wide parabolic well and the quantum well, respectively, utilising a multi-level rate equation model. We also report the first pump-probe cyclotron resonance result in an InAs-AlSb quantum structure. The pump-probe experiment provides a direct determination of the lifetime, giving t = 40 ps in this InAs-AlSb sample. This shows good agreement with an 8 × 8k · p calculation. © 1998 Elsevier Science B.V. All rights reserved.
Original language | English |
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Pages (from-to) | 121-125 |
Number of pages | 5 |
Journal | Physica E: Low-Dimensional Systems and Nanostructures |
Volume | 2 |
Issue number | 1-4 |
DOIs | |
Publication status | Published - 15 Jul 1998 |
Keywords
- Landau-level lifetimes
- Saturation spectroscopy