Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-04-19
Phys. Rev. B 82, 073107 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures; new version includes minor changes to figures and text to increase clarity
Scientific paper
The combined effects of strong disorder, strong correlations and hopping in the Anderson-Hubbard model have been shown to produce a zero bias anomaly which has an energy scale proportional to the hopping and minimal dependence on interaction strength, disorder strength and doping. Disorder-induced suppression of the density of states for a purely local interaction is inconsistent with both the Efros-Shklovskii Coulomb gap and the Altshuler-Aronov anomaly, and moreover the energy scale of this anomaly is inconsistent with the standard energy scales of both weak and strong coupling pictures. We demonstrate that a density of states anomaly with similar features arises in an ensemble of two-site systems, and we argue that the energy scale t emerges in strongly correlated systems with disorder due to the mixing of lower and upper Hubbard orbitals on neighboring sites.
Atkinson W. A.
Wortis Rachel
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