Spontaneous interlayer coherence in bilayer Kondo systems

Details Spontaneous interlayer coherence in bilayer Kondo systems Spontaneous interlayer coherence in bilayer Kondo systems

2004-11-25

arxiv.org/abs/cond-mat/0411659v2

Phys. Rev. B 71, 121102(R) (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figs, (v2) misprints in eqs corrected, final version as published

Scientific paper

10.1103/PhysRevB.71.121102

Bilayer Kondo systems present interesting models to illustrate the competition between the Kondo effect and intermoment exchange. Such bilayers can exhibit two sharply distinct Fermi liquid phases which are distinguished by whether or not the local moments participate in the Fermi sea. We study these phases and the evolution from one to the other upon changing Kondo coupling. We argue that an ordered state with spontaneous interlayer phase coherence generically intervenes between the two Fermi liquids. Such a condensate phase breaks a U(1) symmetry and is bounded by a finite-temperature Kosterlitz-Thouless transition. Based on general arguments and mean-field calculations we investigate the phase diagram and associated quantum phase transitions.

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