Date of Original Version
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 t–Jmodel. 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.
Shu Zhang, Gerhard Müller and Joachim Stolze. Impact of criticality and phase separation on the spin dynamics of the one-dimensional t-J model. J. Appl. Phys. 79 (1996), 5227-5229.
Available at http://dx.doi.org/10.1063/1.361349.