Shape-averaged magnetoconductance (weak localization) is used for the first time to obtain the electron phase coherence time τ_φ in open ballistic GaAs quantum dots. Values for τ_φ in the range of temperature T from 0.34 to 4 K are found to be independent of dot area, and are not consistent with the τ_φ∝T^-2 behavior expected for isolated dots. Surprisingly, τ_φ(T) agrees quantitatively with the predicted dephasing time for disordered two-dimensional electron systems.
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Huibers et al. (1998) studied this question.
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