𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Visualization of the transition from 2d to 3d and from non-k-conservation to k-conservation in the lineshapes of quantum wells and true superlattices

✍ Scribed by J. Christen; M. Krahl; D. Bimberg

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
280 KB
Volume
7
Category
Article
ISSN
0749-6036

No coin nor oath required. For personal study only.

✦ Synopsis

Clear experimental and theoretical evidence is presented that k is not conserved and does not need to be conserved when excitons recombine at low temperatures in GaAs quantum wells and superlattices. This surprising effect is due to thermalization and thus Iocalisation of excitons in potential fluctuations. Increasing temperature as well as increasing coupling of wells is found to reestablish the well known k-conservation rule. A complete lineshape theory of excitonic and free electron-hole recombination processes enables one to describe all limiting cases: The spontaneous emission profile for uncoupled and coupled wells from 1.5 K up to room temperature. The 300 K lineshapes of uncoupled and weakly coupled wells are dominated by excitonic emission.

πŸ“œ SIMILAR VOLUMES

Determination of A0 and D0K of 13CH3F fr
Determination of A0 and D0K of 13CH3F from the Ξ”k = Β±2 Forbidden Transitions to the v5 = 1 Vibrational Level
✍ D. Papousek; Z. Papouskova; Y.C. Hsu; P. Pracna; S. Klee; M. Winnewisser; J. Dem πŸ“‚ Article πŸ“… 1993 πŸ› Elsevier Science 🌐 English βš– 283 KB

The Fourier transform spectrum of the vibration-rotational bands \(v_{2}\) and \(v_{5}\) of gaseous fluoromethane \({ }^{13} \mathrm{CH}_{3} \mathrm{~F}\) was measured at an unapodized resolution \(0.0041 \mathrm{~cm}^{-1}\). Among the assigned lines, 102 belonged to the \(\Delta k= \pm 2\) perturba