Fulde-Ferrell-Larkin-Ovchinnikov pairing in one-dimensional optical lattices
| Autor: | Mario P. Tosi, Matteo Rizzi, Marco Polini, Rosario Fazio, Miguel A. Cazalilla, M.R. Bakhtiari |
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| Přispěvatelé: | Ministero dell'Istruzione, dell'Università e della Ricerca, Academy of Finland, European Commission, Ministerio de Educación y Ciencia (España), Rizzi, M, Polini, M, Cazalilla, Ma, Bakhtiari, Mr, Tosi, Mp, Fazio, Rosario |
| Rok vydání: | 2008 |
| Předmět: |
Condensed Matter::Quantum Gases
Density matrix Physics education.field_of_study Hubbard model Condensed matter physics Lattice field theory Population Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Electronic Optical and Magnetic Materials ATOMS Renormalization Pairing Quantum mechanics TONKS-GIRARDEAU GAS 0103 physical sciences THEOREM ATTRACTIVE HUBBARD-MODEL 010306 general physics Fermi gas Structure factor education |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Physical review. B, Condensed matter and materials physics 77 (2008): 245105. doi:10.1103/PhysRevB.77.245105 info:cnr-pdr/source/autori:Rizzi, M; Polini, M; Cazalilla, MA; Bakhtiari, MR; Tosi, MP; Fazio, R/titolo:Fulde-Ferrell-Larkin-Ovchinnikov pairing in one-dimensional optical lattices/doi:10.1103%2FPhysRevB.77.245105/rivista:Physical review. B, Condensed matter and materials physics/anno:2008/pagina_da:245105/pagina_a:/intervallo_pagine:245105/volume:77 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.77.245105 |
| Popis: | Spin-polarized attractive Fermi gases in one-dimensional (1D) optical lattices are expected to be remarkably good candidates for the observation of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. We model these systems with an attractive Hubbard model with population imbalance. By means of the density-matrix renormalization-group method, we compute the pairing correlations as well as the static spin and charge structure factors in the whole range from weak to strong coupling. We demonstrate that pairing correlations exhibit quasi-long-range order and oscillations at the wave number expected from the FFLO theory. However, we also show by numerically computing the mixed spin-charge static structure factor that charge and spin degrees of freedom appear to be coupled already for a small imbalance. We discuss the consequences of this coupling for the observation of the FFLO phase, as well as for the stabilization of the quasi-long-range order into long-range order by coupling many identical 1D systems, such as in quasi-1D optical lattices. M.R. acknowledges the EU-project SCALA 015714. This work was partly supported by PRIN-MIUR and by the Academy of Finland Project No. 115020. M. A. C. acknowledges financial support from MEC Spain under Grants No. FIS2004-06490-C03-00 and FIS2007-66711-C02-02. |
| Databáze: | OpenAIRE |
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