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- W2016128893 abstract "The dominant deep donor in semiinsulating GaAs, the EL2 defect, may at low temperatures be transferred into a metastable configuration. Under hydrostatic pressure this metastable configuration can capture an extra electron. It is thus possible to observe three different charge states of the EL2 defect in a sample: EL20, EL2+, and (EL2∗)−. Different distributions of electrons among these states in turn lead to different distributions of the fluctuating electric fields in the sample. The far infrared magnetophotoconductivity due to shallow donors was measured in semiinsulating GaAs under hydrostatic pressure. The observed transitions between ground and excited states of dynamically populated shallow donor states are shown to be extremely sensitive to the local electric fields. The halfwidth of the 1s − 2p+ transition, which was previously found to increase when the EL2 was transferred to the metastable state, is observed to increase far more when the same experiment is performed under pressure. The dominant effect is a purely electronic one—population of the acceptor-like level of the EL2—and is not connected with lattice distortion accompanying the transition to the metastable state. The broadening of the linewidth due to EL2 bleaching can therefore also be explained in terms of electrostatics." @default.
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- W2016128893 title "Effects of the population of localized levels on shallow donor transitions in semiinsulating GaAs" @default.
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- W2016128893 doi "https://doi.org/10.1016/0022-3697(94)00254-1" @default.
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