V. V. Val'kov, “Kinematic mechanism of the modulation of the spectral intensity in the spatially uniform system of Hubbard fermions”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2011, Volume 94, Issue 3,Pages <nobr>215

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CONDENSED MATTER

Kinematic mechanism of the modulation of the spectral intensity in the spatially uniform system of Hubbard fermions

V. V. Val'kov^ab

^a L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences
^b M. F. Reshetnev Siberian State Aerospace University

Abstract: Using the exact representation of the Green's function constructed in terms of the Hubbard operators, it has been shown that the kinematic interaction that induces the spin-fluctuation processes in the spatially uniform system of Hubbard fermions leads to significant variations in the spectral intensity $A(\mathbf{k},\omega)$ in the Brillouin zone. As a result, the modulation of $A(\mathbf{k},\omega)$ appears in the Fermi contour. The sign of the hopping integral within the first coordination sphere is determined by the contour section, where $A(\mathbf{k},\omega)$ decreases according to the angle-resolved photoemission spectroscopy data.

Received: 22.02.2011
Revised: 20.05.2011