Evaluation of wavefunction coherence length in a waveguiding structure embedding a InGaAs/InP short-period superlattice
✍ Scribed by D. Campi; C. Cacciatore; H.-C. Neitzert; C. Rigo; C. Coriasso
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 217 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0749-6036
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✦ Synopsis
We have studied the coherence length of the electronic wavefunction in an (\operatorname{InGaAs} / \mathrm{In}) superlattice structure prepared by chemical beam epitaxy. The sample, a p-i-n structure, was processed to form a waveguide modulator, and transmittance and photocurrent measurements were taken at varying photon energy and bias. Clear spectral features were observed in the transmittance measurements that are related to the Wannier-Stark effect. The spectral structures bear information about the coherence length of the electronic wavefunction, which was found to be about (45 \mathrm{~nm}) at room temperature.