Quantum Coherence in an Exactly Solvable One-dimensional Model with Defects
Abstract
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 , characterizing the strength of the defects. For intermediate values of , both quantities become very small, although the ground state wavefunction remains extended.
Cite
@article{arxiv.cond-mat/9505082,
title = {Quantum Coherence in an Exactly Solvable One-dimensional Model with Defects},
author = {P. Schmitteckert and P. Schwab and U. Eckern},
journal= {arXiv preprint arXiv:cond-mat/9505082},
year = {2009}
}
Comments
accepted by Europhys. Lett., latex, 7 pages. A postscript version including the figures is available at: http://www.physik.uni-augsburg.de/theo2/Publications/