| Texto completo | |
| Autor(es): |
Vojta, Thomas
;
Igo, John
;
Hoyos, Jose A.
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Physical Review E; v. 90, n. 1, p. 9-pg., 2014-07-29. |
| Resumo | |
We investigate the nonequilibrium phase transition of the disordered contact process in five space dimensions by means of optimal fluctuation theory and Monte Carlo simulations. We find that the critical behavior is of mean-field type, i.e., identical to that of the clean five-dimensional contact process. It is accompanied by off-critical power-law Griffiths singularities whose dynamical exponent z' saturates at a finite value as the transition is approached. These findings resolve the apparent contradiction between the Harris criterion, which implies that weak disorder is renormalization-group irrelevant, and the rare-region classification, which predicts unconventional behavior. We confirm and illustrate our theory by large-scale Monte Carlo simulations of systems with up to 70(5) sites. We also relate our results to a recently established general relation between the Harris criterion and Griffiths singularities [Phys. Rev. Lett. 112, 075702 (2014)], and we discuss implications for other phase transitions. (AU) | |
| Processo FAPESP: | 13/09850-7 - Disorder, Dynamics, Frustration and Topology in Quantum Condensed Matter |
| Beneficiário: | José Abel Hoyos Neto |
| Modalidade de apoio: | Auxílio à Pesquisa - Reunião - Exterior |