Abstract:
There is a lot of interest in finding and identifying novel
quantum materials. We here focus on d1 materials with a
strong spin-orbit coupling, which are supposed to realize a much
higher symmetry than SU(2), an emergent SU(4) symmetry [1,2].
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Quasiparticles of the Heisenberg spin-1/2 chain — spinons — represent the best experimentally accessible example of fractionalized excitations known to date. Dynamic spin response of the spin chain is typically dominated by the broad multi-spinon continuum that often masks subtle features, such as continuum edge singularities, induced by the interaction between spinons. This, however, is not the case in the small momentum region of the magnetized spin chain where strong interaction between spinons leads to qualitative changes to the response.
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