First observation of an extremely large-dipole infrared transition within the conduction band of a GaAs quantum well
- 15 June 1985
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 46 (12), 1156-1158
- https://doi.org/10.1063/1.95742
Abstract
A new type of optical transition in GaAs quantum wells has been observed. The dipole occurs between two envelope states of the conduction-band electron wave function, and is called a quantum well envelope state transition (QWEST). The QWEST is observed by infrared absorption for two structures with 65-Å-thick- and 82-Å-thick wells. The transitions exhibit resonant energies of 152 and 121 meV respectively, full width at half-maximum linewidths as narrow as 10 meV at room temperature, and an oscillator strength of 12.2. The material is anticipated to have subpicosecond relaxation times and be ideal for low-power optical digital logic.Keywords
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