The Spin-Exchange Dynamical Structure Factor of the S=1/2 Heisenberg Chain

Details The Spin-Exchange Dynamical Structure Factor of the S=1/2 Heisenberg Chain The Spin-Exchange Dynamical Structure Factor of the S=1/2 Heisenberg Chain

2011-01-12

arxiv.org/abs/1101.2356v1

Phys. Rev. Lett. 106, 157205 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

We determine the spin-exchange dynamical structure factor of the Heisenberg spin chain, as is measured by indirect Resonant Inelastic X-ray Scattering (RIXS). We find that two-spin RIXS excitations nearly entirely fractionalize into *two spinon* states. These share the same continuum lower bound as single-spin neutron scattering excitations, even if the relevant final states belong to orthogonal symmetry sectors. The RIXS spectral weight is mainly carried by higher-energy excitations, and is beyond the reach of the low-energy effective theories of Luttinger liquid type.

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