Hidden Integrability of a Kondo Impurity in an Unconventional Host
arXiv:cond-mat/9812086 · doi:10.1016/S0375-9601(98)00952-9
Abstract
We study a spin-1/2 Kondo impurity coupled to an unconventional host in which the density of band states vanishes either precisely at (``gapless'' systems) or on some interval around the Fermi level (``gapped''systems). Despite an essentially nonlinear band dispersion, the system is proven to exhibit hidden integrability and is diagonalized exactly by the Bethe ansatz.
4 pages, RevTex