Superconductivity in a two dimensional extended Hubbard model
نویسندگان
چکیده
منابع مشابه
Superconductivity in the two-dimensional Hubbard model.
A refined variational wave function for the two-dimensional repulsive Hubbard model is studied numerically , with the aim of approaching the difficult crossover regime of intermediate values of U. The issue of a superconducting ground state with d-wave symmetry is investigated for an average electron density n ≈ 0.8 and for U = 8t. Due to finite-size effects a clear-cut answer to this fundament...
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Recently developed numerical methods have enabled the explicit construction of the superconducting state of the Hubbard model of strongly correlated electrons in parameter regimes where the model also exhibits a pseudogap and a Mott insulating phase. d(x(2)-y(2)) symmetry superconductivity is found to occur in proximity to the Mott insulator, but separated from it by a pseudogapped nonsupercond...
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To understand the interplay of d-wave superconductivity and antiferromagnetism, we consider a two-dimensional extended Hubbard model with nearest neighbor attractive interaction. The Hamiltonian is solved in the mean-field approximation on a finite lattice. In the impurity-free case, the minimum energy solutions show phase separation as predicted previously based on free energy argument. The ph...
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M. Capone1 and G. Kotliar2 1INFM-SMC and Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, Via dei Taurini 19, I-00185, Rome, Italy and Physics Department, University of Rome “La Sapienza,” Piazzale A. Moro 5, I-00185, Rome, Italy 2Physics Department and Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08854, USA Received 9 March 2006; published 30 Augus...
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ژورنال
عنوان ژورنال: The European Physical Journal B
سال: 2005
ISSN: 1434-6028,1434-6036
DOI: 10.1140/epjb/e2005-00209-1