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Physica C Superconductivity

Spin-fluctuation mediated interaction in the two-dimensional Hubbard model

N. Bulut, Douglas J. Scalapino, Steven R. White

Published May 1, 1995• 11 citations
Publisher
DOI
10.1016/0921-4534(95)00130-1

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(1) The wave number dependence of the static spin susceptibility χ( q ) and (2) the effective interaction between quasiparticles mediated by spin fluctuations in the dilute two dimensional Hubbard model are investigated. The quantum Monte Carlo method (QMC) and the fluctuation exchange approximation (FLEX) are applied to this model. It is found that a maximum at wave number q =0 emerges and develops in χ( q ) as the interaction U gets strong. It is also found that the most attractive component of the effective interaction mediated by spin fluctuations is the p -wave component in the strong coupling region where a maximum at q =0 devolops in χ( q ).
(1) The wave number dependence of the static spin susceptibility χ( q ) and (2) the effective interaction between quasiparticles mediated by spin fluctuations in the dilute two dimensional Hubbard model are investigated. The quantum Monte Carlo method (QMC) and the fluctuation exchange approximation (FLEX) are applied to this model. It is found that a maximum at wave number q =0 emerges and develops in χ( q ) as the interaction U gets strong. It is also found that the most attractive component of the effective interaction mediated by spin fluctuations is the p -wave component in the strong coupling region where a maximum at q =0 devolops in χ( q ).