Anderson-like impurity in the one-dimensional t-J model: formation of local states and magnetic behaviour

Details Anderson-like impurity in the one-dimensional t-J model: formation of local states and magnetic behaviour Anderson-like impurity in the one-dimensional t-J model: formation of local states and magnetic behaviour

2006-03-08

arxiv.org/abs/cond-mat/0603198v1

Phys. Rev. B73 (2006) 214419

Physics

Condensed Matter

Strongly Correlated Electrons

32 pages, 11 figures

Scientific paper

10.1103/PhysRevB.73.214419

We consider an integrable model describing an Anderson-like impurity coupled to an open $t$--$J$ chain. Both the hybridization (i.e. its coupling to bulk chain) and the local spectrum can be controlled without breaking the integrability of the model. As the hybridization is varied, holon and spinon bound states appear in the many body ground state. Based on the exact solution we study the state of the impurity and its contribution to thermodynamic quantities as a function of an applied magnetic field. Kondo behaviour in the magnetic response of the impurity can be observed provided that its parameters have been adjusted properly to the energy scales of the holon and spinon excitations of the one-dimensional bulk.

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