Open su(4)-invariant spin ladder with boundary defects

Details Open su(4)-invariant spin ladder with boundary defects Open su(4)-invariant spin ladder with boundary defects

2000-09-06

arxiv.org/abs/cond-mat/0009073v1

Phys. Rev. B62, 3845(2000)

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex 9 pages, published in PRB

Scientific paper

10.1103/PhysRevB.62.3845

The integrable su(4)-invariant spin-ladder model with boundary defect is studied using the Bethe ansatz method. The exact phase diagram for the ground state is given and the boundary quantum critical behavior is discussed. It consists of a gapped phase in which the rungs of the ladder form singlet states and a gapless Luttinger liquid phase. It is found that in the gapped phase the boundary bound state corresponds to an unscreened local moment, while in the Luttinger liquid phase the local moment is screened at low temperatures in analogy to the Kondo effect.

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