Ground State Properties of an Anderson Impurity in a Gapless Host
Abstract
Using the Bethe ansatz method, we study ground state properties of a U-->∞ Anderson impurity in a ``gapless'' host, where a density of band states vanishes at the Fermi level ɛF as \|ɛ-ɛF\|. As in metals, the impurity spin is proven to be screened at arbitrary parameters of the system. However, the impurity occupancy as a function of the bare impurity energy is shown to acquire novel qualitative features which demonstrate a nonuniversal behavior of the system. The latter explains why the Kondo screening is absent (or exists only at quite a large electron-impurity coupling) in earlier studies based on scaling arguments.
- Publication:
-
Physical Review Letters
- Pub Date:
- January 1999
- DOI:
- 10.1103/PhysRevLett.82.839
- arXiv:
- arXiv:cond-mat/9810014
- Bibcode:
- 1999PhRvL..82..839R
- Keywords:
-
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 5 pages, no figure, RevTex