Abstract
Shape-averaged magnetoconductance (weak localization) is used to measure the electron phase coherence time τ φ in open ballistic GaAs quantum dots with temperature T ranging from 0.1 to 4 K. τ φ ( T) is not consistent with the τ φ ∝T −2 behavior expected for isolated dots, and does not saturate over the temperature range measured. Surprisingly, τ φ ( T) agrees quantitatively with predicted dephasing times for disordered two-dimensional electron systems, suggesting the presence of a Nyquist phase relaxation mechanism.
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