Assisted hopping and interaction effects in impurity models

Details Assisted hopping and interaction effects in impurity models Assisted hopping and interaction effects in impurity models

2004-04-26

arxiv.org/abs/cond-mat/0404612v1

Phys. Rev. B 70, 125118 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.70.125118

We study, using Numerical Renormalization Group methods, the generalization of the Anderson impurity model where the hopping depends on the filling of the impurity. We show that the model, for sufficiently large values of the assisted hopping term, shows a regime where local pairing correlations are enhanced. These correlations involve pairs fluctuating between on site and nearest neighbor positions.

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