Landau-level lifetimes in PbTe nipi superlattices, PbTe/PbEuTe and InAs/AlSb quantum wells

✍ Scribed by C.J.G.M Langerak; B.N Murdin; C.M Ciesla; J Oswald; A Homer; G Springholz; G Bauer; R.A Stradling; M Kamal-Saadi; E Gornik; C.R Pidgeon

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 117 KB
• Volume: 2
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(98)00027-7

✦ Synopsis

Landau-level lifetimes are determined from saturation cyclotron resonance (CR) in wide parabolic wells, quantum wells and bulk PbTe-Pb \V Eu V Te 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 "40 ps in this InAs-AlSb sample. This shows good agreement with an 8;8k ) p calculation.