Onset of Glassy Dynamics in a Two-Dimensional Electron System in Silicon
Abstract
The time-dependent fluctuations of conductivity σ have been studied in a two-dimensional electron system in low-mobility, small-size Si inversion layers. The noise power spectrum is ~1/fα with α exhibiting a sharp jump at a certain electron density ns=ng. An enormous increase in the relative variance of σ is observed as ns is reduced below ng, reflecting a dramatic slowing down of the electron dynamics. This is attributed to the freezing of the electron glass. The data strongly suggest that glassy dynamics persists in the metallic phase.
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