Multichannel pseudogap Kondo model: large-N solution and quantum-critical dynamics |
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Authors: | Vojta M |
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Affiliation: | Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Universit?t Augsburg, 86135 Augsburg, Germany. |
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Abstract: | We discuss a multichannel SU(N) Kondo model which displays nontrivial zero-temperature phase transitions due to a conduction electron density of states vanishing with a power law at the Fermi level. In a particular large- N limit, the system is described by coupled integral equations corresponding to a dynamic saddle point. We exactly determine the universal low-energy behavior of spectral densities at the scale-invariant fixed points, obtain anomalous exponents, and compute scaling functions describing the crossover near the quantum-critical points. We argue that our findings are relevant to recent experiments on impurity-doped d-wave superconductors. |
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