Multichannel pseudogap Kondo model: Large-N solution and quantum-critical dynamics
摘要
We discuss a multichannel SU(N) Kondo model which displays non-trivial 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.
引用
@article{arxiv.cond-mat/0102089,
title = {Multichannel pseudogap Kondo model: Large-N solution and quantum-critical dynamics},
author = {Matthias Vojta},
journal= {arXiv preprint arXiv:cond-mat/0102089},
year = {2009}
}
备注
4 pages, 3 figs; extended discussion of large-N spin representations, added references; accepted for publication in PRL