Nonexponential Relaxations in a Two-Dimensional Electron System in Silicon

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The relaxations of conductivity have been studied in a strongly disordered two-dimensional (2D) electron system in Si after excitation far from equilibrium by a rapid change of carrier density nₛ at low temperatures T. The dramatic and precise dependence of the relaxations on nₛ and T strongly suggests (a) the transition to a glassy phase as T->0, and (b) the Coulomb interactions between 2D electrons play a dominant role in the observed out-of-equilibrium dynamics.