Coherence in real space: the transition range from bulk to confined states studied by the Franz–Keldysh effect
✍ Scribed by H.J. Kolbe; C. Agert; W. Stolz; G. Weiser
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 133 KB
- Volume
- 6
- Category
- Article
- ISSN
- 1386-9477
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✦ Synopsis
The reduction of the thickness of samples to less than the mean free path in bulk material leads to conÿnement e ects which can be resolved as deviation of ÿeld-modulated spectra from the Franz-Keldysh e ect of bulk samples. We demonstrate such changes in a 100 nm thick GaInAs layer by using di erential electroabsorption spectroscopy. The conÿnement e ects are best seen at small ÿelds and lead to reduction of the range of Franz-Keldysh oscillations, the appearance of oscillations related to the quantum-conÿned Stark e ect at higher energy and ÿnestructure of Franz-Keldysh oscillations near the gap. These features are reproduced by model calculations based on envelope functions.