Electron transport in granular metals.
We consider thermodynamic and transport properties of a long granular array with strongly connected grains (intergrain conductance g>>1). We find that the system's conductance and differential capacitance exhibits activated behavior, approximately exp([-T(*)/T]. The gap T(*) represents the energy needed to create a long single-electron charge soliton propagating through the array. This scale is parametrically larger than the energy at which conventional perturbation theory breaks down.
Altland
Alexander
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Institut für theoretische Physik, Zülpicher Strasse 77, 50937 Köln, Germany.
Glazman
Leonid I
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Kamenev
Alex
A