LOW-TEMPERATURE SPIN-DIFFUSION IN THE ONE-DIMENSIONAL QUANTUM O(3) NONLINEAR SIGMA-MODEL

Authors
SACHDEV S DAMLE K
Citation
S. Sachdev et K. Damle, LOW-TEMPERATURE SPIN-DIFFUSION IN THE ONE-DIMENSIONAL QUANTUM O(3) NONLINEAR SIGMA-MODEL, Physical review letters, 78(5), 1997, pp. 943-946
Citations number
18
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
78
Issue
5
Year of publication
1997
Pages
943 - 946
Database
ISI
SICI code
0031-9007(1997)78:5<943:LSITOQ>2.0.ZU;2-4
Abstract
An effective, low temperature, classical model for spin transport in t he one-dimensional, gapped, quantum O(3) nonlinear sigma model is deve loped. Its correlators are obtained by a mapping to a model solved ear lier by Jepsen. We obtain universal functions for the ballistic-to-dif fusive crossover and the value of the spin diffusion constant, and the se are claimed to be exact at low temperatures. Implications for exper iments on one-dimensional insulators with a spin gap are noted.