Non-trivial fixed point in a twofold orbitally degenerate Anderson impurity model

Abstract

We study the phase diagram of a twofold orbitally degenerate Anderson impurity model which presents a non-trivial fixed point similar to the two-impurity Kondo model one. Remarkably, this fixed point is more robust than the latter one, since it can only be destabilized by orbital or gauge symmetry breaking. The impurity model is interesting per se, but here our interest is rather in the possibility that it might be representative of the behavior of a strongly-correlated lattice model close to a Mott transition. We argue that this lattice model should unavoidably encounter the non-trivial fixed point just before the Mott transition and react to its instability by spontaneous generation of an orbital, spin-orbital or superconducting order parameter.

arXiv comment4 pages, 4 figures

References in corpus (4)

• Strongly Correlated Superconductivity
• Conformal Field Theory Approach to the 2-Impurity Kondo Problem: Comparison with Numerical Renormalization Group Results
• Simple Bosonization Solution of the 2-channel Kondo Model: I. Analytical Calculation of Finite-Size Crossover Spectrum
• Solution of the two-impurity Kondo model: critical point, Fermi-liquid phase, and crossover

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