Abstract
We present experimental results showing that at hydrostatic pressure exceeding approximately 0.3 GPa the $\mathrm{EL}2$ metastable state becomes optically active in both $n$-type and semi-insulating GaAs, and the pressure-induced optical recovery (PIOR) can be easily observed. PIOR is practically full and extremely efficient (with an efficiency comparable with that of the photoquenching process). The proper choice of the energy of the illuminating light allows reversible cycles of photoquenching and subsequent optical recovery of the characteristic intra-$\mathrm{EL}2$ absorption at 5 K. PIOR is a few orders of magnitude more efficient than pure optical recovery processes already reported for atmospheric pressure.
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