Disorder Screening in Strongly Correlated Systems

Details Disorder Screening in Strongly Correlated Systems Disorder Screening in Strongly Correlated Systems

2003-03-10

arxiv.org/abs/cond-mat/0303145v1

Phys. Rev. Lett. 91, 066603 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4+epsilon pages, 3 figures

Scientific paper

10.1103/PhysRevLett.91.066603

Electron-electron interactions generally reduce the low temperature resistivity due to the screening of the impurity potential by the electron gas. In the weak-coupling limit, the magnitude of this screening effect is determined by the thermodynamic compressibility which is proportional to the inverse screening length. We show that when strong correlations are present, although the compressibility is reduced, the screening effect is nevertheless strongly enhanced. This phenomenon is traced to the same non-perturbative Kondo-like processes that lead to strong mass enhancements, but which are absent in weak coupling approaches. We predict metallicity to be strongly stabilized in an intermediate regime where the interactions and the disorder are of comparable magnitude.

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