Springer LINK: The European Physical Journal B - Abstract Volume 3 Issue 1 (1998) pp 17-22

The European Physical Journal B

ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)

Table of Contents

Abstract Volume 3 Issue 1 (1998) pp 17-22

Dynamical spin and charge response functions in the doped two-dimensional Hubbard model

T. Saikawa (a), A. Ferraz

Centro Internacional de Física da Matéria Condensada - ICCMP, Universidade de Brasília, CEP 70919-970 Brasília-DF, Brazil

Received: 25 September 1997 / Revised: 19 December 1997 / Accepted: 9 January 1998

Abstract: Dynamical properties of the spin and charge response functions in the doped two-dimensional Hubbard model are calculated by taking into account the drastic separation of the single-particle spectral function into the low-energy coherent and high-energy incoherent parts due to the strong Coulomb interaction. We show that this evolution of the electronic states is the origin of the broad and structureless feature in the charge response function. In the weak coupling regime the low-energy enhancement of the spin excitation is produced which can be explained within the random phase approximation. However, for the larger interaction close to the antiferromagnetic Stoner condition, the low-energy intensity of the spin excitation is suppressed.

PACS. 71.27.+a Strongly correlated electron systems; heavy fermions - 75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) - 71.10.Fd Lattice fermion models (Hubbard model, etc.)

(a) email: saikawa@iccmp.br

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