✦ LIBER ✦
Homogeneous nucleation of opposite moving dipole domains and current self-oscillations in undoped photoexcited superlattices
✍ Scribed by J.I. Arana; L.L. Bonilla; H.T. Grahn
- Book ID
- 104084935
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 552 KB
- Volume
- 40
- Category
- Article
- ISSN
- 1386-9477
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✦ Synopsis
A model for charge transport in undoped photoexcited semiconductor superlattices with field-dependent recombination is proposed and analyzed. Under dc voltage bias and large photoexcitation, there appear self-sustained oscillations of the current due to repeated homogeneous nucleation of a number of charge dipole waves inside the sample. Different from the case of a constant recombination coefficient, nucleated dipole waves may split in two oppositely moving dipoles.