Magnetization and spin-spin energy diffusion in the XY model: a diagrammatic approach
| dc.creator | Greenbaum, Daniel | |
| dc.date | 2005-11-16 | |
| dc.date.accessioned | 2026-07-07T06:46:11Z | |
| dc.date.available | 2026-07-07T06:46:11Z | |
| dc.description | It is shown that the diagrammatic cluster expansion technique for equilibrium averages of spin operators may be straightforwardly extended to the calculation of time-dependent correlation functions of spin operators. We use this technique to calculate exactly the first two non-vanishing moments of the spin-spin and energy-energy correlation functions of the XY model with arbitrary couplings, in the long-wavelength, infinite temperature limit appropriate for spin diffusion. These moments are then used to estimate the magnetization and spin-spin energy diffusion coefficients of the model using a phenomenological theory of Redfield. Qualitative agreement is obtained with recent experiments measuring diffusion of dipolar energy in calcium fluoride. | |
| dc.description | 28 pages, 15 embedded .eps figures, Elsevier preprint format | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0511399 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0511399 | |
| dc.identifier | J. Magn. Reson. 179, 11 (2006) | |
| dc.identifier | doi:10.1016/j.jmr.2005.10.011 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/103253 | |
| dc.subject | Statistical Mechanics | |
| dc.subject | Other Condensed Matter | |
| dc.title | Magnetization and spin-spin energy diffusion in the XY model: a diagrammatic approach | |
| dc.type | text |