| Texto completo | |
| Autor(es): |
Granato, Enzo
Número total de Autores: 1
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| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW B; v. 100, n. 10, p. 10-pg., 2019-09-16. |
| Resumo | |
We study the dynamic vortex Mott transition in two-dimensional superconducting arrays in a magnetic field with f flux quantum per plaquette. The transition is induced by external driving current and thermal fluctuations near rational vortex densities set by the value of f and has been observed experimentally from the scaling behavior of the differential resistivity. Recently, numerical simulations of interacting vortex models have demonstrated this behavior only near fractional f. A fine-grid vortex model is introduced, which allows us to consider both the cases of fractional and integer f. The critical behavior is determined from a scaling analysis of the current-voltage relation and voltage correlations near the transition and by Monte Carlo simulations. The critical exponents for the transition near f = 1/2 are consistent with the experimental observations and previous numerical results from a standard vortex model. The same scaling behavior is obtained for f = 1, in agreement with experiments. However, the estimated correlation-length exponent indicates that even at integer f, the critical behavior is not of mean-field type. (AU) | |
| Processo FAPESP: | 18/19586-9 - Dinâmica, defeitos topológicos e transições de fase em sistemas bidimensionais |
| Beneficiário: | Enzo Granato |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |