Narrowing of the intersubband absorption spectrum by localization of continuum resonances in a strong electric field
- 19 April 1993
- journal article
- conference paper
- Published by AIP Publishing in Applied Physics Letters
- Vol. 62 (16) , 1931-1933
- https://doi.org/10.1063/1.109517
Abstract
Direct observation of strong localization of continuum resonances in the presence of an electric field is reported. Our structure consists of doped GaInAs quantum wells cladded by AlInAs/GaInAs quarter wave electron stacks and by AlInAs barriers. In a strong electric field of the appropriate polarity the first continuum resonance is strongly confined above the wells by the high reflectivity λ/4 stacks and by the field-induced triangular potential barrier, while the second continuum resonance becomes localized in the latter. This manifests itself in a strong narrowing of the intersubband absorption spectrum as a function of the electric field as a greater fraction of the oscillator strength is concentrated into a transition from the ground state of the well to a quasibound state in the continuum.Keywords
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