The temperature and gate voltage dependences of the phase breaking time are studied experimentally in GaAs/InGaAs heterostructures with a single quantum well. It is shown that appearance of states at the Fermi energy in the doped layers leads to a significant decrease of the phase breaking time of the carriers in the quantum well and to saturation of the phase breaking time at low temperature.
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Minkov et al. (2001) studied this question.
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