Exact solution of a t-J chain with impurity

Details Exact solution of a t-J chain with impurity Exact solution of a t-J chain with impurity

1996-10-31

arxiv.org/abs/cond-mat/9610222v3

Nucl. Phys. B489 [FS] (1997) 697

Physics

Condensed Matter

Strongly Correlated Electrons

33 pages Latex, figures included

Scientific paper

10.1016/S0550-3213(97)00059-X

We study the effects of an integrable impurity in a periodic t-J chain. The impurity couples to both spin and charge degrees of freedom and has the interesting feature that the interaction with the bulk can be varied continuously without losing integrability. We first consider ground state properties close to half-filling in the presence of a small bulk magnetic field. We calculate the impurity contributions to the (zero temperature) susceptibilities and the low temperature specific heat and determine the high-temperature characteristics of the impurity. We then investigate transport properties by computing the spin and charge stiffnesses at zero temperature. Finally the impurity phase--shifts are calculated and the existence of an impurity bound state in the holon sector is established.

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