Electronic correlation effects and the Coulomb gap at finite temperature
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Updated: Oct 8, 2026

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Published on: August 2, 2019
B Sandow1, K Gloos, R Rentzsch
1Institut für Experimentalphysik, Freie Universität Berlin, Germany.
Abstract:
We have investigated the effect of the long-range Coulomb interaction on the one-particle excitation spectrum of n-type germanium, using tunneling spectroscopy on mechanically controllable break junctions. At low temperatures, the tunnel conductance shows a minimum at zero bias voltage due to the Coulomb gap. Above 1 K, the gap is filled by thermal excitations. This behavior is reflected in the variable-range hopping resistivity measured on the same samples: up to a few degrees Kelvin the Efros-Shklovskii lnR infinity T(-1/2) law is obeyed, whereas at higher temperatures deviations from this law occur. The type of crossover differs from that considered previously in the literature.
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