Abstract
We show that the presence of Fermi or non-Fermi liquid behavior in the Anderson impurity models may be read off the infrared threshold exponents governing the spinon and holon dynamics in a slave boson representation of these models. We construct a conserving -matrix approximation which recovers the exact exponents with good numerical accuracy. Our approximation includes both coherent spin flip scattering and charge fluctuation processes. For the single-channel case the tendency to form bound states drastically modifies the low energy behavior. For the multichannel case in the Kondo limit the bound state contributions are unimportant.
- Received 7 November 1996
DOI:https://doi.org/10.1103/PhysRevLett.79.261
©1997 American Physical Society