Adjacent Spin Operator Dynamical Structure Factor of the S=1/2 Heisenberg Chain

Details Adjacent Spin Operator Dynamical Structure Factor of the S=1/2 Heisenberg Chain Adjacent Spin Operator Dynamical Structure Factor of the S=1/2 Heisenberg Chain

2012-01-04

arxiv.org/abs/1201.0867v1

J. Stat. Mech. (2012) P03012

Physics

Condensed Matter

Strongly Correlated Electrons

16 pages

Scientific paper

10.1088/1742-5468/2012/03/P03012

Considering the adjacent spin operators $S^z_jS^z_{j+1}$ and $S^-_jS^-_{j+1}$ in the S=1/2 Heisenberg chain, we give a determinant representation of their form factors. The dynamical structure factors of the respective operators are computed over the whole Brillouin zone in several magnetic fields and the resulting signal is analyzed in terms of excitation types. Among other results, we find that the $S^z_jS^z_{j+1}$ dynamical structure factor carries a large weight of the 4-spinon excitations which are distinguishable from the 2-spinon signal because they are located outside the 2-spinon spectrum.

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