Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-10-06
Phys. Rev. B 73, 4, 041304 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages; 5 figures; Published in PRB Rapid-Communications
Scientific paper
10.1103/PhysRevB.73.041304
We report measurements of the temperature-dependent conductivity in a silicon metal-oxide-semiconductor field-effect transistor that contains sodium impurities in the oxide layer. We explain the variation of conductivity in terms of Coulomb interactions that are partially screened by the proximity of the metal gate. The study of the conductivity exponential prefactor and the localization length as a function of gate voltage have allowed us to determine the electronic density of states and has provided arguments for the presence of two distinct bands and a soft gap at low temperature.
Barnes Crispin H. W.
Ferrus T.
George Ramishvili
Lumpkin N.
Paul D. J.
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