Magnetic field induced quantum phase transitions in the two-impurity Anderson model

Details Magnetic field induced quantum phase transitions in the two-impurity Anderson model Magnetic field induced quantum phase transitions in the two-impurity Anderson model

2010-11-30

arxiv.org/abs/1011.6629v1

Physics

Condensed Matter

Strongly Correlated Electrons

4+epsilon pages, 4 figures

Scientific paper

In the two-impurity Anderson model, the inter-impurity spin exchange interaction favors a spin singlet state between two impurities leading to the breakdown of the Kondo effect. We show that a local uniform magnetic field can delocalize the quasiparticles to restore the Kondo resonance. This transition is found to be continuous, accompanied by not only the divergence of the staggered (antiferromagnetic) susceptibility, but also the divergence of the uniform spin susceptibility. This may imply that the magnetic field induced quantum phase transitions in Kondo systems are in favor of the local critical type.

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