Quantum criticality and the break-up of the Kondo pseudo-potential

Details Quantum criticality and the break-up of the Kondo pseudo-potential Quantum criticality and the break-up of the Kondo pseudo-potential

2007-05-31

arxiv.org/abs/0706.0026v1

Physica B, 403, 1194-1198 (2008).

Physics

Condensed Matter

Strongly Correlated Electrons

Invited talk at SCES 2007, Houston, Texas

Scientific paper

10.1016/j.physb.2007.10.312

We discuss how Anderson's ideas of nominal and real valence can be incorporated into the current discussion of heavy electron quantum criticality. In the heavy electron phase, the nominal valence of a screened magnetic ion differs from its real valence by one unit. We identify this discrepancy with the formation of a positively charged background we call the Kondo pseudo-potential. At the quantum critical point, the sudden collapse of the heavy electron Fermi surface can be identified with the return of the nominal to the real valence. This leads to the interesting idea that the heavy electron quantum critical point may involve locally critical charge degrees of freedom. We discuss how this might come about within a large N Schwinger boson scheme.

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