Glassy Dynamics in Disordered Electronic Systems Reveal Striking Thermal Memory Effects.
Memory is one of the unique qualities of a glassy system. The relaxation of a glass to equilibrium contains information on the sample's excitation history, an effect often refer to as "aging." We demonstrate that under the right conditions a glass can also possess a different type of memory. We study the conductance relaxation of electron glasses that are fabricated at low temperatures. Remarkably, the dynamics are found to depend not only on the ambient measurement temperature but also on the maximum temperature to which the system was exposed. Hence the system "remembers" its highest temperature. This effect may be qualitatively understood in terms of energy barriers and local minima in configuration space and therefore may be a general property of the glass state.
The Department of Physics, Bar Ilan University, Ramat Gan 52900, Israel.
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Eisenbach
The Department of Physics, Bar Ilan University, Ramat Gan 52900, Israel.
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Havdala
Institut Néel, CNRS, BP 166, 38042 Grenoble Cedex 9, France.
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Delahaye
Institut Néel, CNRS, BP 166, 38042 Grenoble Cedex 9, France.
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Grenet
School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
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Amir
The Department of Physics, Bar Ilan University, Ramat Gan 52900, Israel.|Institut Néel, CNRS, BP 166, 38042 Grenoble Cedex 9, France.
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Frydman