Paul, D. J., Lynch, Stephen Anthony  ORCID: https://orcid.org/0000-0001-9818-2284, Bates, R., Ikonić, Z., Kelsall, R. W., Harrison, P., Norris, D. J., Liew, S. L., Cullis, A. G., Arnone, D. D., Pidgeon, C. R., Murzyn, P., Wells, J.-P. R. and Bradley, I. V.
2003.
Si/SiGe quantum-cascade emitters for terahertz applications.
Physica E: Low-dimensional Systems and Nanostructures
16
(1)
, pp. 147-155.
10.1016/S1386-9477(02)00590-8
|
Abstract
The quantum cascade laser provides one possible method of realizing high efficiency light emission from indirect band gap materials such as silicon. Strain-symmetrized Si/SiGe samples designed to investigate the intersubband properties of quantum wells are examined. Electroluminescence data from Si/SiGe quantum-cascade staircases demonstrating edge emission from heavy-hole to heavy-hole transitions and light-hole to heavy-hole transitions are presented. In surface-normal emission only light-hole to heavy-hole electroluminescence is observed at ( wavelength) as predicted by theory. Modulation-doped SiGe quantum well samples are also investigated to determine the underlying physics in the system. Results of picosecond time resolved studies of the dynamics of the intersubband transitions using a free electron laser are presented which show approximately constant relaxation times of below .
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Physics and Astronomy |
| Subjects: | Q Science > QC Physics |
| Uncontrolled Keywords: | Si/SiGe; Intersubband; Electroluminescence; Quantum cascade |
| Additional Information: | Proceedings of the Twelfth International Winterschool on New Developments in Solids State Physics, "Low- Dimensional Systems: From 2D to Molecules" |
| Publisher: | Elsevier |
| ISSN: | 1386-9477 |
| Last Modified: | 19 Oct 2022 10:43 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/25323 |
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