Anomalous magnetic splitting of the Kondo resonance

Details Anomalous magnetic splitting of the Kondo resonance Anomalous magnetic splitting of the Kondo resonance

1999-11-04

arxiv.org/abs/cond-mat/9911068v3

Phys. Rev. Lett. 85, 1722-1725 (2000).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 eps figures; published version

Scientific paper

10.1103/PhysRevLett.85.1722

The splitting of the Kondo resonance in the density of states of an Anderson impurity in finite magnetic field is calculated from the exact Bethe-ansatz solution. The result gives an estimate of the electron spectral function for nonzero magnetic field and Kondo temperature, with consequences for transport experiments on quantum dots in the Kondo regime. The strong correlations of the Kondo ground state cause a significant low-temperature reduction of the peak splitting. Explicit formulae are found for the shift and broadening of the Kondo peaks. A likely cause of the problems of large-N approaches to spin-1/2 impurities at finite magnetic field is suggested.

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