Investigating Bethe String Excitations in a Spin-1/2 antiferromagnetic XXZ chain under magnetic field
A longitudinal field applied parallel to the easy access of an XXZ spin chain shows exotic physics. Above a critical field, the long-range antiferromagnetic order is destroyed and the system enters a gapless critical regime. As well as spinon-pair excitations (known as psinons), bound states of magnons can also be excited, these are known as Bethe strings and were first predicted by Hans Bethe in 1931 but have only been verified very recently using terahertz spectroscopy measurements on the model magnet SrCo2V2O8. These excitations are also expected to be observeable by inelastic neutron scattering which would be able to measure the longitudinal excitations (inaccessible to terahertz spectroscopy) and provide information about the wavevector dependence of these excitation (terahertz spectroscopy is confined to the gamma point). The goal is this proposal is to perform a thorough investigation of the excitations in the field-induced critical state of SrCo2V2O8 using inelastic neutron scattering and make a comparison to theory.
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Bella Lake; BERA Anup Kumar; ISLAM A T M Nazmul and OLLIVIER Jacques. (2018). Investigating Bethe String Excitations in a Spin-1/2 antiferromagnetic XXZ chain under magnetic field. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-05-700
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