Luttinger sum rule for finite systems of correlated electrons

Details Luttinger sum rule for finite systems of correlated electrons Luttinger sum rule for finite systems of correlated electrons

2006-09-12

arxiv.org/abs/cond-mat/0609280v2

Phys. Rev. B 75, 045111 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure

Scientific paper

10.1103/PhysRevB.75.045111

The validity of the Luttinger sum rule is considered for finite systems of interacting electrons, where the Fermi volume is determined by location of zeroes of Green's function. It is shown that the sum rule in the paramagnetic state is evidently violated within the planar t-J model at low doping while for the related Hubbard model, even in the presence of next-nearest-neighbor hopping, no clearcut exception is found.

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