Ultrasensitive electroabsorption due to Wannier–Stark localization in extremely shallow superlattices at 77 K
- 30 December 1991
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 59 (27) , 3622-3624
- https://doi.org/10.1063/1.105626
Abstract
We have observed Wannier–Stark localization in extremely shallow superlattices (SL) at 77 K, which results in a quasi‐blue shift of the absorption edge at very small electric fields. The formation of a Stark ladder is also clearly shown. The blue shift results in a change in absorption coefficient from 1.7 μm−1 (at 0.2 V/μm) to 0.98 μm−1 (at 0.6 V/μm) for a GaAs/Al0.07Ga0.93As SL; for a GaAs/Al0.02Ga0.98As SL we obtain a change from 2.1 μm−1 (at 1.1 V/μm) to 0.9 μm−1 (at 1.5 V/μm).Keywords
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