Hamiltonian Heisenberg freeon

The application of second-order perturbation theory to the Hiickel-Hubbard Hamiltonian for z close to one (Section 4.2) yields the freeon, antiferromagnetic, Heisenberg exchange Hamiltonian,... [Pg.15]

Thirty years later Heisenberg showed that the new hypothesis of atomic structure was the freeon exchange interaction expressed by the freeon Heisenberg Hamiltonian,... [Pg.26]

The freeon Heisenberg Hamiltonian is converted to the spin Heisenberg Hamiltonian by the Dirac identity,... [Pg.28]

The freeon theories are converted in to spin theories by means of the Dirac identity, which coverts the freeon Heisenberg to the spin Hamiltonian... [Pg.30]

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