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AuthorsA. Klauser, J. Mossel, J.S. Caux, J. van den Brink
TitleThe Spin-Exchange Dynamical Structure Factor of the S=1/2 Heisenberg Chain
JournalPhysical Review Letters
Volume106
Year2011
Pages4
ISSN00319007
FacultyFaculty of Science
Institute/dept.FNWI: Institute for Theoretical Physics (ITF)
AbstractWe 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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