Session B53: Disordered and Glassy Systems II

11:15 AM–2:15 PM, Monday, February 27, 2012
Room: 153B

Sponsoring Unit: GSNP
Chair: Craig Maloney, Carnegie Mellon University

Abstract ID: BAPS.2012.MAR.B53.13

Abstract: B53.00013 : Slow relaxations in glasses: full aging and beyond

1:39 PM–1:51 PM

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  Yoseph Imry
    (The Weizmann Institute of Science)

  Ariel Amir
    (Harvard University)

  Yuval Oreg
    (The Weizmann Institute of Science)

  Stefano Borini
    (INRIM, Torino)

Experiments performed in the last years demonstrated slow relaxations and aging in the conductance of a large variety of materials. Here, we present experimental and theoretical results for conductance relaxation and aging for the case-study example of porous silicon. The relaxations are experimentally observed even at room temperature over time scales of hours, and when a strong electric field is applied for a time $t_w$, the ensuing relaxation depends on $t_w$. We derive a theoretical curve and show that all experimental data collapse onto it with a single time scale as a fitting parameter. This time scale is found to be of the order of thousands of seconds at room temperature. The generic theory suggested is not fine-tuned to porous silicon, and thus we believe the results should be universal, and the presented method should be applicable for many other systems manifesting memory and other glassy effects. Reference: Phys. Rev. Lett. 107, 186407 (2011)

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