Impact of criticality and phase separation on the spin dynamics of the one-dimensional t-J model

Details Impact of criticality and phase separation on the spin dynamics of the one-dimensional t-J model Impact of criticality and phase separation on the spin dynamics of the one-dimensional t-J model

1995-08-29

arxiv.org/abs/cond-mat/9508134v1

Physics

Condensed Matter

RevTex file + uuencoded ps file of 3 figures

Scientific paper

10.1063/1.361349

The recursion method is used to determine the T=0 spin dynamic structure factor S_{zz}(q,\omega) in the Luttinger liquid state and in the phase-separated state of the one-dimensional t-J model. As the exchange coupling increases from zero, the dispersions and line shapes of the dominant spin excitations are observed to undergo a major metamorphosis between the free-fermion limit and the onset of phase separation. The familiar two-spinon spectrum of the Heisenberg antiferromagnetic chain emerges gradually in the strongly phase-separated state.

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