Spin diffusion and the anisotropic spin-1/2 Heisenberg chain
| dc.creator | Sirker, J. | |
| dc.date | 2006-04-12 | |
| dc.date.accessioned | 2026-07-07T07:05:29Z | |
| dc.date.available | 2026-07-07T07:05:29Z | |
| dc.description | Measurements of the spin-lattice relaxation rate 1/T_1 by nuclear magnetic resonance for the one-dimensional Heisenberg antiferromagnet Sr_2CuO_3 have provided evidence for a diffusion-like contribution at finite temperature and small wave-vector. By analyzing real-time data for the auto- and nearest-neighbor spin-spin correlation functions obtained by the density-matrix renormalization group I show that such a contribution indeed exists for temperatures T>J, where J is the coupling constant, but that it becomes exponentially suppressed for T << J. I present evidence that the frequency-dependence of 1/T_1 in the Heisenberg case is smoothly connected to that in the free fermion case where the exponential suppression of the diffusion-like contribution is easily understood. | |
| dc.description | 9 pages, 7 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0604327 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0604327 | |
| dc.identifier | Phys. Rev. B 73, 224424 (2006) | |
| dc.identifier | doi:10.1103/PhysRevB.73.224424 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/109683 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Spin diffusion and the anisotropic spin-1/2 Heisenberg chain | |
| dc.type | text |