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Kondo Proximity Effect: How Does a Metal Penetrate into a Mott Insulator?

R. W. Helmes, T. A. Costi, and A. Rosch
Phys. Rev. Lett. 101, 066802 – Published 6 August 2008

Abstract

We consider a heterostructure of a metal and a paramagnetic Mott insulator using an adaptation of dynamical mean-field theory to describe inhomogeneous systems. The metal can penetrate into the insulator via the Kondo effect. We investigate the scaling properties of the metal-insulator interface close to the critical point of the Mott insulator. At criticality, the quasiparticle weight decays as 1/x2 with distance x from the metal within our mean-field theory. Our numerical results (using the numerical renormalization group as an impurity solver) show that the prefactor of this power law is extremely small.

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  • Received 7 May 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.066802

©2008 American Physical Society

Authors & Affiliations

R. W. Helmes1, T. A. Costi2, and A. Rosch1

  • 1Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany
  • 2Institute of Solid State Research, Research Centre Jülich, 52425 Jülich, Germany

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Vol. 101, Iss. 6 — 8 August 2008

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