TERAHERTZ RADIATION IN SUPERLATTICES IN MODERATE ELECTRIC FIELD.
- Resource Type
- Article
- Authors
- HAN, PENG; JIN, KUI-JUAN; ZHOU, YUE-LIANG; ZHOU, QING-LI; HIRAKAWA, K.
- Source
- International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics. 3/30/2006, Vol. 20 Issue 8, p937-945. 9p. 5 Graphs.
- Subject
- *SUPERLATTICES
*ELECTROMAGNETIC waves
*ELECTRIC fields
*GALLIUM arsenide semiconductors
*ELECTROMAGNETIC fields
- Language
- ISSN
- 0217-9792
We have studied the terahertz (THz) radiation in superlattices (SLs) in moderate electric field region (between 12 kV/cm and 25 kV/cm) from both theoretical and experimental aspects in this work. The THz emission intensity has been calculated for three samples of GaAs/Al0.3Ga0.7As SLs by using Kane model. The theoretical results show that the radiation intensity increases until the electric field F achieves a certain value between 14 kV/cm and 16 kV/cm for various samples, and then starts to roll off. The agreement of the calculated results with the experimental data demonstrates that the rolling of THz radiation intensity is due to the competition of field induced localization of wave functions and the increasing of the photon energy in THz radiation with increased electric fields. Furthermore, it is also shown that THz radiation intensity can be affected by the scattering of the randomly distributed Al atoms in the barriers. [ABSTRACT FROM AUTHOR]