Multichannel Pseudogap Kondo Model: Large-N Solution and Quantum-Critical Dynamics

Journal Article · Mon Aug 27 00:00:00 EDT 2001 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.87.097202· OSTI ID:40277489

Vojta, Matthias

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.

• Sponsoring Organization: (US)
• OSTI ID: 40277489
• Journal Information: Physical Review Letters, Vol. 87, Issue 9; Other Information: DOI: 10.1103/PhysRevLett.87.097202; Othernumber: PRLTAO000087000009097202000001; 010135PRL; PBD: 27 Aug 2001; ISSN 0031-9007
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTRON DENSITY
FERMI LEVEL
INTEGRAL EQUATIONS
SUPERCONDUCTORS