Microscopic details of two-dimensional spectroscopy of one-dimensional quantum Ising magnets

Abstract

This work explores the effectiveness of two-dimensional coherent spectroscopy for understanding the microscopic properties of quantum magnets. Motivated by experiments on the Ising chain magnet CoNb${}_{2}$O${}_{6}$, it is shown that the 2D spectra are markedly different for the two proposed microscopic Hamiltonians - the transverse field Ising model and the twisted Kitaev spin chain - even though the linear response is similar. The findings showcase the power of 2D spectroscopy for quantifying microscopic descriptions and understanding the dynamics of fractionalized excitations of quantum magnets.

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