On the Problem of Validity of Anderson and Kondo Models in Physics of Strongly Correlated Electron Systems

TL;DR

This paper questions the applicability of Anderson and Kondo models to certain strongly correlated electron systems and proposes an alternative mechanism involving quantum tunneling for heavy fermion formation.

Contribution

It introduces a new mechanism based on quantum tunneling as an alternative to Kondo physics for heavy fermion state formation.

Findings

Anderson and Kondo models are not universally applicable.

Quantum tunneling can explain heavy fermion states.

Proposes an alternative to traditional Kondo mechanism.

Abstract

We argue that the Anderson and Kondo models turn out to be irrelevant for the description of some strongly correlated electron systems and we suggest the mechanism for the formation of many-body states (heavy fermions) being an alternative to the Kondo one. This mechanism involves the quantum tunneling of a heavy particle between the states in the double-well potential.