Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-03-28
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 11 figures, to be published in EPJ
Scientific paper
10.1140/epjb/e2002-00362-y
The two dimensional crossover from independent particle towards collective motion is studied using 2 spinless fermions interacting via a U/r Coulomb repulsion in a LxL square lattice with periodic boundary conditions and nearest neighbor hopping t. Three regimes characterize the ground state when U/t increases. Firstly, when the fluctuation $\Delta r$ of the spacing r between the two particles is larger than the lattice spacing, there is a scaling length $Lo=\sqrt{8}\pi^2(t/U)$ such that the relative fluctuation $\Delta r/
Martinez Moises
Pichard Jean-Louis
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