Universal cross-over behavior of a magnetic impurity and consequences for doping in spin-1/2 chains
Abstract
We consider a magnetic impurity in the antiferromagnetic spin-1/2 chain which is equivalent to the two-channel Kondo problem in terms of the field theoretical description. Using a modification of the transfer-matrix density matrix renormalization group (DMRG) we are able to determine local and global properties in the thermodynamic limit. The cross-over function for the impurity susceptibility is calculated over a large temperature range, which exhibits universal data-collapse. We are also able to determine the local susceptibilities near the impurity, which show an interesting competition of boundary effects. This results in quantitative predictions for experiments on doped spin-1/2 chains, which could observe two-channel Kondo physics directly.
Keywords
Cite
@article{arxiv.cond-mat/9807060,
title = {Universal cross-over behavior of a magnetic impurity and consequences for doping in spin-1/2 chains},
author = {Sebastian Eggert and Stefan Rommer},
journal= {arXiv preprint arXiv:cond-mat/9807060},
year = {2009}
}
Comments
5 pages in revtex format including 3 embedded figures (using epsf). The latest version in PDF format is available from http://fy.chalmers.se/~eggert/papers/crossover.pdf . Accepted by PRL