| Autor: |
A. Schmeller, Jörg P. Kotthaus, A. Koll, Wiebke Hansen, G. Böhm, Ch. Peters, G. Weimann, G. Trankle |
| Rok vydání: |
1995 |
| Předmět: |
|
| Zdroj: |
Confined Electrons and Photons ISBN: 9781461358077 |
| DOI: |
10.1007/978-1-4615-1963-8_31 |
| Popis: |
State-of-the-art growth techniques nowadays allow to tailor electronic and optical crystal parameters like the band gap, the conduction and valence band offsets and (therefore) the dielectric function on the atomic scale leading to an ever growing variety of new phenomena of both technological and scientific interest. A wealth of effects specific to these man-made materials has been discovered among which the quantum-confined stark effect (QCSE) (Miller et al. 1984a) is most relevant for this contribution. As pointed out by Miller earlier in this volume excitons confined into a crystal layer fabricated to be energetically favourable for electrons and holes (a so-called type I quantum well) and narrow compared to the 3D exciton diameter are extremely stable against ionisation. Therefore neither electric fields perpendicular to the quantum well that are as large as 50 times the classical ionisation threshold (Miller et al. 1984a) nor the bombardment by phonons of even room temperature populations can destroy the clear excitonic absorption features in these materials. This effect is extensively used to realise optical detectors, modulators and all-optical switching devices (Lentine and Miller 1993). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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