Statics and dynamics of charge fluctuations in the t-J model

Details Statics and dynamics of charge fluctuations in the t-J model Statics and dynamics of charge fluctuations in the t-J model

1996-08-12

arxiv.org/abs/cond-mat/9608053v1

Physics

Condensed Matter

10 latex pages, 4 figures as post-script files

Scientific paper

10.1103/PhysRevB.54.8985

The equation for the charge vertex $\gamma$ of the $t-J$ model is derived and solved in leading order of an 1/N expansion, working directly in terms of Hubbard operators. Various quantities which depend crucially on $\gamma$ are then calculated, such as the life time and the transport life time of electrons due to a charge coupling to other degrees of freedom and the charge-charge correlation function. Our results show that the static screening of charges and the dynamics of charge fluctuations depend only weakly on $J$ and are mainly determined by the constraint of having no double occupancies of sites.

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