The conductance of a narrow two-dimensional electron gas in a GaAs: Al0.3{Ga}0.7$As heterojunction fluctuates as a function of magnetic field. The variance and correlation length of the fluctuations have been measured for a number of temperatures, and the electron phase-breaking length is found to vary as a small negative power of the temperature.
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Thornton et al. (1987) studied this question.
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