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Time Evolution of the Neel State

A quasionedimentional spin chain (s=1/2) is considered as a lattice consisting of two sublattices. The attention is paid to the states which are pure spin states of the whole lattice and both sublattices, the value of the sublattices' spins being maximum. It is shown that the Neel state can be considered as a superposition of such states. The exact equation for this superposition coefficients is developed. The possibility of the Neel state to be the eigenstate of a Hamiltonian is discussed. Several model Hamiltonians are examined, the well known ones and few novel Hamiltonians being considered. The time evolution of the Neel state in different models is studied with the help of Fock-Krylov method.

preprint2007arXivOpen access
Alexey A. SoluyanovSerge N. ZagoulaevIgor V. Abarenkov
cond-mat.str-el
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Alexey A. SoluyanovSerge N. ZagoulaevIgor V. Abarenkov

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