Quadratic operators used in deducing exact ground states for correlated systems: ferromagnetism at half filling provided by a dispersive band

Details Quadratic operators used in deducing exact ground states for correlated systems: ferromagnetism at half filling provided by a dispersive band Quadratic operators used in deducing exact ground states for correlated systems: ferromagnetism at half filling provided by a dispersive band

2007-08-30

arxiv.org/abs/0708.4117v1

Jour. of Phys.: Condens. Matter 19, 386209 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages

Scientific paper

10.1088/0953-8984/19/38/386209

Quadratic operators are used in transforming the model Hamiltonian (H) of one correlated and dispersive band in an unique positive semidefinite form coopting both the kinetic and interacting part of H. The expression is used in deducing exact ground states which are minimum energy eigenstates only of the full Hamiltonian. It is shown in this frame that at half filling, also dispersive bands can provide ferromagnetism in exact terms by correlation effects .

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