| dc.creator | Berim, GO | |
| dc.creator | Cabrera, GG | |
| dc.date | 1997 | |
| dc.date | APR 15 | |
| dc.date | 2014-12-16T11:33:44Z | |
| dc.date | 2015-11-26T17:55:47Z | |
| dc.date | 2014-12-16T11:33:44Z | |
| dc.date | 2015-11-26T17:55:47Z | |
| dc.date.accessioned | 2018-03-29T00:39:31Z | |
| dc.date.available | 2018-03-29T00:39:31Z | |
| dc.identifier | Physica A. Elsevier Science Bv, v. 238, n. 41730, n. 211, n. 224, 1997. | |
| dc.identifier | 0378-4371 | |
| dc.identifier | WOS:A1997WV80900015 | |
| dc.identifier | 10.1016/S0378-4371(96)00458-X | |
| dc.identifier | http://www.repositorio.unicamp.br/jspui/handle/REPOSIP/81307 | |
| dc.identifier | http://www.repositorio.unicamp.br/handle/REPOSIP/81307 | |
| dc.identifier | http://repositorio.unicamp.br/jspui/handle/REPOSIP/81307 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1291112 | |
| dc.description | Exact results for the dynamics of the spatially inhomogeneous magnetization (SIM) in the one-dimensional dimerized isotropic XY model are obtained, and the long-time behavior of SIM is considered in detail. It is shown that in the asymptotic limit t --> infinity, the time dependence of SIM can be represented as a sum of several components oscillating at different frequencies. Amplitudes of these components decrease according to the (t/tau)(-v) power law. It is shown that both, the inverse of the time scale tau(-1) and the exponent v, have critical-like behavior with respect to the wave-vector Q characterizing the spatial inhomogeneity of the initial state. The value of tau(-1) goes to zero at \Q\ --> Q(ci), where Q(ci) (i = 1, 2, 3) are critical values of Q determined by parameters of the main Hamiltonian only. Just at points Q(c1), Q(c2), the exponent v changes its value discontinuously from v = 1/2 to v = 1/4. This effect is very similar to the critical slowing down phenomena in phase transitions. Due to the long-time tails in the relaxation process, we critically discuss the validity of the spin temperature assumption in spin systems. | |
| dc.description | 238 | |
| dc.description | 41730 | |
| dc.description | 211 | |
| dc.description | 224 | |
| dc.language | en | |
| dc.publisher | Elsevier Science Bv | |
| dc.publisher | Amsterdam | |
| dc.publisher | Holanda | |
| dc.relation | Physica A | |
| dc.relation | Physica A | |
| dc.rights | fechado | |
| dc.rights | http://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy | |
| dc.source | Web of Science | |
| dc.subject | one-dimensional dimerized XY model | |
| dc.subject | inhomogeneous initial state | |
| dc.subject | dynamics | |
| dc.subject | Model | |
| dc.title | Long time tails in the dynamics of the spatially inhomogeneous magnetization of dimerized isotropic XY chains for spin s=1/2 | |
| dc.type | Artículos de revistas | |
