Electronic correlation effects and the Coulomb gap at finite temperature

Details Electronic correlation effects and the Coulomb gap at finite temperature Electronic correlation effects and the Coulomb gap at finite temperature

2000-06-29

arxiv.org/abs/cond-mat/0006461v1

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.86.1845

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. The tunnel conductance was measured as a function of energy and temperature. At low temperatures, the spectra reveal a minimum at zero bias voltage due to the Coulomb gap. In the temperature range above 1 K the Coulomb gap is filled by thermal excitations. This behavior is reflected in the temperature dependence of the variable-range hopping resitivity measured on the same samples: Up to a few degrees Kelvin the Efros-Shkovskii ln$R \propto T^{-1/2}$ law is obeyed, whereas at higher temperatures deviations from this law are observed, indicating a cross-over to Mott's ln$R \propto T^{-1/4}$ law. The mechanism of this cross-over is different from that considered previously in the literature.

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