Institut Néel Grenoble

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Insulating granular aluminium films are experimental realizations of disordered insulators. They have received a renewed interest recently because they display slow relaxation of the conductance after a rapid cool down to low temperature. This relaxation could be the experimental signature of a new type of glass predicted theoretically 30 years ago and called the electron glass. Measuring electrical field effects in thin films, we have found that part of the conductance relaxation is insensitive to gate voltage changes. This shows the existence of a metallic like screening in the films and allows us to estimate the typical screening length. Although the nature of the screening is related to the existence of an electron glass, it has so far rarely been considered experimentally and theoretically. Full text

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