RELAXATION IN THE S=1 2 ISOTROPIC HEISENBERG CHAIN AT T=INFINITY - TOWARDS A SIMPLE INTUITIVE INTERPRETATION/

Authors
Citation
S. Sen, RELAXATION IN THE S=1 2 ISOTROPIC HEISENBERG CHAIN AT T=INFINITY - TOWARDS A SIMPLE INTUITIVE INTERPRETATION/, Physica. A, 222(1-4), 1995, pp. 195-204
Citations number
40
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
ISSN journal
0378-4371
Volume
222
Issue
1-4
Year of publication
1995
Pages
195 - 204
Database
ISI
SICI code
0378-4371(1995)222:1-4<195:RITS2I>2.0.ZU;2-6
Abstract
This work reports a significantly improved estimation of the on-site d ynamical spin pair correlation function in the s = 1/2 isotropic Heise nberg chain at T = infinity with resect to an earlier study (Phys. Rev . B 46 (1992) 14617) which has received some attention in the literatu re. The calculations have been performed using a recently developed te chnique for estimating unsolvable infinite continued fractions which a re relevant for calculating the relaxation functions. This improvement became possible due to an important advance in the machine based comp utation of quantum mechanical commutators by M. Bohm and H. Leschke (P hysica A 199 (1993) 116). The work reported here builds on the results of Bohm and Leschke and provides new predictions on the behavior of t he on-site dynamical spin pair correlation function. This work also pr ovides insights into possible ways to qualitatively understand the com plex relaxation at high temperatures associated with a hermitian opera tor A(t) in a system described by a hermitian Hamiltonian H = H-0 + H- 1, where none of these three operators commutes with one another.