Now showing items 1-3 of 3
Path-integral approach to the Hubbard model
(American Physical Society, 1991-02)
A path-integral approach to the Hubbard model is developed for the whole range of the coupling strength U. At half filling, the strong-coupling results are readily reproduced within the simple Gaussian fluctuations. The ...
Power spectrum of the current in systems with a conserved density
(American Physical Society, 1991-09)
Motivated by recent studies of model sandpiles, the power spectrum S of the current in dissipative dynamical systems with a conserved density is investigated. In contrast to self-organized criticality exhibited in certain ...
Finger formation in a driven diffusive system
(American Physical Society, 1991-05)
A driven diffusive lattice gas is studied in a rectangular geometry: particles are fed in at one side and extracted at the other, after being swept through the system by a uniform driving field. Being periodic in the ...