Document Type

Article

Date of Original Version

4-15-1996

Abstract

The recursion method is used to determine the T=0 spin dynamic structure factor S zz (q,ω) in the Luttinger liquid state and in the phase‐separated state of the one‐dimensional tJmodel. 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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