The 2D nonlinear response of a magnetoelectrically coupled dimerized spin-1/2 chain shows a galvanoelectric line whose width measures spinon scattering rates, plus RPA vertex corrections that create bound states and transfer spectral weight to low energies.
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Two-dimensional nonlinear dynamical response of the magnetoelectrically driven dimerized spin-$1{/}2$ chain
The 2D nonlinear response of a magnetoelectrically coupled dimerized spin-1/2 chain shows a galvanoelectric line whose width measures spinon scattering rates, plus RPA vertex corrections that create bound states and transfer spectral weight to low energies.