University of Minnesota
School of Physics & Astronomy
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Alex Kamenev

“Electron Transport in Granular Metals”
A. Altland, L. I. Glazman, and A. Kamenev , Phys. Rev. Lett. 92, 026801 (2004)

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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, ?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.