Superconductivity in the 2D attractive Hubbard model within a functional field-theorical RG
| Author | Ferraz Filho, Álvaro; Correa, Eberth; Freire, Hermann | |
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| Date | 2011-11-10 | |
| Keywords | Renormalization group Attractive Hubbard model superconductivity | |
| Citation | ||
| Abstract | We apply the functional field-theoretical renormalization group methodology up to twoloop order to the 2D attractive Hubbard model for weak bare interaction. Since the momentum-resolved quasiparticle weight ZΛ(p) is always close to unity in the RG flow, higher-order quantum fluctuations do not affect crucially the low-energy dynamics in this case. As a result, we observe a s-wave singlet superconducting quasi-long-range order phase as a function of doping in good agreement with other numerical methods. To assess the role played by the fluctuations we compare the critical temperature Tc in which the quasi-long-range superconducting order phase takes place within our approach with mean-field theory and quantum Monte Carlo results. | |
| URI | https://repositorio.ufrn.br/jspui/handle/123456789/28810 | |
| Collections | CCET - DFTE - Artigos publicados em periódicos |
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