Publication: Effect of nonlocal interactions on the disorder-induced zero-bias anomaly in the Anderson-Hubbard model

All || By Area || By Year

Title	Effect of nonlocal interactions on the disorder-induced zero-bias anomaly in the Anderson-Hubbard model
Authors/Editors*	Hong-Yi Chen, R. Wortis and W.A. Atkinson
Where published*	Physical Review B
How published*	Journal
Year*	2012
Volume	85
Number	235139
Pages
Publisher
Keywords
Link
Abstract	To expand the framework available for interpreting experiments on disordered strongly correlated systems, and in particular to explore further the strong-coupling zero-bias anomaly found in the Anderson-Hubbard model, we ask how this anomaly responds to the addition of nonlocal electron- electron interactions. We use exact diagonalization to calculate the single-particle density of states of the extended Anderson-Hubbard model. We find that for weak nonlocal interactions the form of the zero-bias anomaly is qualitatively unchanged. The energy scale of the anomaly continues to be set by an effective hopping amplitude renormalized by the nonlocal interaction. At larger values of the nonlocal interaction strength, however, hopping ceases to be a relevant energy scale and higher energy features associated with charge correlations dominate the density of states.