Aging Effects Across the Metal-Insulator Transition in Two Dimensions

Details Aging Effects Across the Metal-Insulator Transition in Two Dimensions Aging Effects Across the Metal-Insulator Transition in Two Dimensions

2007-08-17

arxiv.org/abs/0708.2415v2

Phys. Rev. Lett. 99, 216401 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4+ pages, 5 figures; minor changes, accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.99.216401

Aging effects in the relaxations of conductivity of a two-dimensional electron system in Si have been studied as a function of carrier density. They reveal an abrupt change in the nature of the glassy phase at the metal-insulator transition (MIT): (a) while full aging is observed in the insulating regime, there are significant departures from full aging on the metallic side of the MIT, before the glassy phase disappears completely at a higher density $n_g$; (b) the amplitude of the relaxations peaks just below the MIT, and it is strongly suppressed in the insulating phase. Other aspects of aging, including large non-Gaussian noise and similarities to spin glasses, also have been discussed.

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