Exact Solution of a Backward Scattering Kondo Model
WANG Yu-peng1, PU Fu- ke2,3(Fu-Cho PU)
1Cryogenic Laboratory, Chinese Academy of Sciences, Beijing 100080
2Department of Physics, Guangzhou Teachers’College, Guangzhou 510400
3Institute of Physics, Chinese Academy of Sciences, Beijing 100080
Exact Solution of a Backward Scattering Kondo Model
WANG Yu-peng1;PU Fu- ke2,3(Fu-Cho PU)
1Cryogenic Laboratory, Chinese Academy of Sciences, Beijing 100080
2Department of Physics, Guangzhou Teachers’College, Guangzhou 510400
3Institute of Physics, Chinese Academy of Sciences, Beijing 100080
Abstract： To specify the difference between the one-dimensional Kondo problem and the three-dimensional Kondo problem, we consider a model which describes the interaction between one-dimensional free electrons and a magnetic impurity. Bethe ansatz exact results and scaling analysis show that if JF > -| JB |, the Kondo screening occurs. There is no ferromagnetic Kondo screening in such a system but the long range antiferromagnetic Kondo coupling is relevant. As soon as the Coulomb interaction is introduced, the crossovers between the scaling trajectories in the parameter region JF < -| JB | and the trajectories in other parameter regions arise and ferromagnetic Kondo screening may occur.
1996, Vol. 13 
