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Phys Rev Lett. 2002 Jun 10;88(23):236401. Epub 2002 May 23.

Onset of glassy dynamics in a two-dimensional electron system in silicon.

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1
National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.

Erratum in

  • Phys Rev Lett. 2002 Dec 31;89(28 Pt 1):289904-1..

Abstract

The fluctuations of conductivity sigma with time have been studied in a two-dimensional electron system in low-mobility Si inversion layers. The noise power spectrum is approximately 1/f(alpha) with alpha exhibiting a sharp jump at an electron density n(s) = n(g). A huge increase in the relative variance of sigma is observed as n(s) is reduced below n(g), 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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