Spin-1 chain doped with mobile S=1/2 fermions
Condensed Matter
2009-10-31 v1
Abstract
We investigate doping of a two-orbital chain with mobile fermions as a valid model for . The S=1 spins are stabilized by strong, ferromagnetic (fm) Hund's rule couplings. We calculate correlation functions and thermodynamic quantities by DMRG methods and find a new hierarchy of energy scales in the spin sector upon doping. Gapless spin-excitations are generated at a lower energy scale by interactions among itinerant polarons created by each hole and coexist with the larger scale of the gapful spin-liquid background of the S=1 chain accompanied by a finite string-order parameter.
Cite
@article{arxiv.cond-mat/9912273,
title = {Spin-1 chain doped with mobile S=1/2 fermions},
author = {Beat Ammon and Masatoshi Imada},
journal= {arXiv preprint arXiv:cond-mat/9912273},
year = {2009}
}
Comments
5 pages and 5 eps-figures