Kinks in the Kondo problem
Abstract
We find the exact quasiparticle spectrum, elastic S matrix, and free energy for the continuum Kondo problem of k species of electrons coupled to an impurity of spin S. Here, the impurity becomes an immobile quasiparticle sitting on the boundary. The particles are ``kinks,'' which can be thought of as field configurations interpolating between adjacent wells of a potential with k+1 degenerate minima. For the overscreened case k>2S, the impurity in the continuum is a kink as well, which explains the noninteger number of boundary states.
- Publication:
-
Physical Review Letters
- Pub Date:
- October 1993
- DOI:
- 10.1103/PhysRevLett.71.2485
- arXiv:
- arXiv:cond-mat/9304031
- Bibcode:
- 1993PhRvL..71.2485F
- Keywords:
-
- 75.20.Hr;
- 11.20.Dj;
- Local moment in compounds and alloys;
- Kondo effect valence fluctuations heavy fermions;
- Condensed Matter;
- High Energy Physics - Theory
- E-Print:
- 9 pages +1 figure