Quantum Coherence in an Exactly Solvable One-dimensional Model with Defects

Details Quantum Coherence in an Exactly Solvable One-dimensional Model with Defects Quantum Coherence in an Exactly Solvable One-dimensional Model with Defects

1995-05-18

arxiv.org/abs/cond-mat/9505082v1

Physics

Condensed Matter

accepted by Europhys. Lett., latex, 7 pages. A postscript version including the figures is available at: http://www.physik.u

Scientific paper

10.1209/epl/i1996-00418-8

Using the Quantum Inverse Scattering Method we construct an integrable Heisenberg-XXZ-model, or equivalently a model for spinless fermions with nearest-neighbour interaction, with defects. Each defect involves three sites with a fine tuning between nearest-neighbour and next-nearest-neighbour terms. We investigate the finite size corrections to the ground state energy and its dependence on an external flux as a function of a parameter $\nu$, characterizing the strength of the defects. For intermediate values of $\nu$, both quantities become very small, although the ground state wavefunction remains extended.

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