Dynamical behavior of the random-bond transverse Ising model with four-spin interactions

Citation
B. Boechat et al., Dynamical behavior of the random-bond transverse Ising model with four-spin interactions, PHYS REV B, 61(21), 2000, pp. 14327-14330
Citations number
42
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
61
Issue
21
Year of publication
2000
Pages
14327 - 14330
Database
ISI
SICI code
0163-1829(20000601)61:21<14327:DBOTRT>2.0.ZU;2-U
Abstract
We study the time evolution of the one-dimensional random-bond transverse I sing model with four-spin interactions. We calculate the time-dependent cor relation function as well as the longitudinal relaxation function of the in finite chain. We analyze how the presence of disorder affect the dynamical behavior of the system in comparison with the pure model. We find that the main effect of disorder is to produce a crossover from a central mode to a collective-mode type of dynamics, as the concentration of weaker bonds is e nhanced. Such crossover is also present in the case of an increase in bond dilution.