Pairfield fluctuations of a 2D Hubbard model
نویسندگان
چکیده
منابع مشابه
Pseudogaps in the 2D Hubbard Model.
We study the pseudogaps in the spectra of the 2D Hubbard model using both finite-size and dynamical cluster approximation (DCA) quantum Monte Carlo calculations. At half-filling, a charge pseudogap, accompanied by non-Fermi-liquid behavior in the self-energy, is shown to persist in the thermodynamic limit. The DCA (finite-size) method systematically underestimates (overestimates) the width of t...
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A renormalization-group and bosonization approach for a multi-band Hubbard Hamiltonian in one dimension is described. Based on the limit of many bands, it is argued that this Hamiltonian with bare repulsive electron-electron interactions is scaled under specific conditions to a model in which superconducting fluctuations dominate. PACS numbers: 74.10.+v, 71.27.+a Typeset using REVTEX
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Theory of spin and charge fluctuations in the Hubbard model. Abstract A self-consistent theory of both spin and charge fluctuations in the Hubbard model is presented. It is in quantitative agreement with Monte Carlo data at least up to intermediate coupling (U ∼ 8t). It includes both short-wavelength quantum renormalization effects, and long-wavelength thermal fluctuations which can destroy lon...
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B. Kyung, S. Allen, and A.-M. S. Tremblay Département de Physique and Centre de Recherche sur les Propriétés Électroniques de Matériaux Avancés, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1 Institut Canadien de Recherches Avancées, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1 ~Received 2 October 2000; revised manuscript received 2 March 2001; published 31 July 2001!
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Using the negative U Hubbard model we analyze normal state properties of a superconductor. In this model there exists a characteristic pairing temperature TP above a superconducting critical temperature. Below TP electrons start to form incoherent pairs. The fluctuations in charge and phase are precursors of charge density wave and superconductivity phases depending on band filling. They lead n...
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ژورنال
عنوان ژورنال: npj Quantum Materials
سال: 2019
ISSN: 2397-4648
DOI: 10.1038/s41535-019-0169-9