Huge (but finite) time scales in slow relaxations: beyond simple aging |
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Authors: | Amir Ariel Borini Stefano Oreg Yuval Imry Yoseph |
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Affiliation: | Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel. |
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Abstract: | 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 tw, the ensuing relaxation depends on tw. 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. |
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