Abstract
The authors show that the electric field strongly influences the electron emission from the effective-mass, metastable, excited states of DX centres in Al0.55Ga0.45As, while up to the field of 4.5*105 V cm-1 no influence on the emission from the group, localized state of DX centres has been detected. Such behaviour is inconsistent with the small lattice relaxation models of the DX centre and can be understood if the DX centres are bistable donors and/or of the negative-U type.
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