Dephasing in Open Quantum Dots
A. G. Huibers, M. Switkes, C. M. Marcus, K. Campman, A. C. Gossard
Abstract
Shape-averaged magnetoconductance (weak localization) is used for the first time to obtain the electron phase coherence time τϕ in open ballistic GaAs quantum dots. Values for τϕ in the range of temperature T from 0.335 to 4 K are found to be independent of dot area, and are not consistent with the τϕ T-2 behavior expected for isolated dots. Surprisingly, τϕ(T) agrees quantitatively with the predicted dephasing time for disordered two-dimensional electron systems.
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