TITLE

First observation of an extremely large-dipole infrared transition within the conduction band of a GaAs quantum well

AUTHOR(S)
West, L. C.; Eglash, S. J.
PUB. DATE
June 1985
SOURCE
Applied Physics Letters;6/15/1985, Vol. 46 Issue 12, p1156
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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-Ã…-thick- and 82-Ã…-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.
ACCESSION #
9817702

 

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