Year: 1999
Type: article
Abstract: The $\ensuremath{\beta}$ function of the multichannel Kondo model is calculated exactly in the limit of large spin N and channel number $M=\ensuremath{\gamma}N$, with constant $\ensuremath{\gamma}$. There are no corrections in any finite order of $1/N$. One zero is found at a finite coupling strength, showing directly the non-Fermi-liquid behavior of the model. This renormalization group flow allows introduction of a variational principle for the entropy, to obtain the low-temperature thermodynamics. Thus, in particular, the low-temperature thermodynamics of the noncrossing approximation to the Kondo model becomes accessible.
Author: Kurt Fischer
Institution: The University of Tokyo
Language: Latvian
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2020533568