TITLE

Negative photoconductivity of two-dimensional holes in GaAs/AlGaAs heterojunctions

AUTHOR(S)
Chou, M. J.; Tsui, D. C.; Weimann, G.
PUB. DATE
September 1985
SOURCE
Applied Physics Letters;9/15/1985, Vol. 47 Issue 6, p609
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A negative photoconductivity is observed due to the two-dimensional (2D) holes at GaAs/Al0.5Ga0.5As heterojunctions under illumination by a red light-emitting diode below ∼6 K. The photoconductivity follows a nonexponential decay after the illumination is turned off. Quantum transport measurements are made to demonstrate explicitly that the photoconductivity is due to a decrease in the density and mobility of the 2D holes, and a model is proposed to explain the phenomenon.
ACCESSION #
9818155

 

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