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Nonlinear spectroscopy of bound states in perturbed Ising spin chains | | GiBaik Sim
; Johannes Knolle
; Frank Pollmann
; | | Date: |
1 Sep 2022 | | Abstract: | We study the nonlinear response of non-integrable 1D spin models using
infinite matrix-product state techniques. As a benchmark and demonstration of
the method, we first calculate the 2D coherent spectroscopy for the exactly
soluble ferromagnetic transverse field Ising model, where excitations are
freely moving domain-walls. We then investigate the distinct signatures of
confined bound states by introducing a longitudinal field and observe the
emergence of strong non-rephasing like signals. To interpret the observed
phenomena, we use a two-kink approximation to perturbatively compute the 2D
spectra. We find good agreement in comparison with the exact results of the
infinite matrix-product state method in the strongly confined regime. We
discuss the relevance of our results for quasi$-$1D Ising spin chain materials
such as $mathrm{CoNb}_2mathrm{O}_6$. | | Source: | arXiv, 2209.00720 | | Services: | Forum | Review | PDF | Favorites | |
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