论文标题
在扰动的旋转链中结合状态的非线性光谱
Nonlinear spectroscopy of bound states in perturbed Ising spin chains
论文作者
论文摘要
我们使用无限基质 - 产品态技术研究了不可融合1D自旋模型的非线性响应。作为该方法的基准和演示，我们首先为精确可溶的铁磁横向场Ising模型计算2D相干光谱，其中激发是自由移动的域壁。然后，我们通过引入一个纵向领域来研究受关联状态的不同签名，并观察到强烈的非信号的出现。为了解释观察到的现象，我们使用两键近似值来扰动地计算2D光谱。与强限制的制度相比，我们发现与无限基质 - 产品方法的确切结果相比，我们发现了良好的一致性。我们讨论了我们的结果与Quasi $ - $ 1D ISING自旋链材料的相关性，例如$ \ MATHRM {CONB} _2 \ MATHRM {O} _6 $。
We study the nonlinear response of non-integrable 1D spin models using infinite matrix-product state techniques. As a benchmark and demonstration of the method, we first calculate the 2D coherent spectroscopy for the exactly soluble ferromagnetic transverse field Ising model, where excitations are freely moving domain-walls. We then investigate the distinct signatures of confined bound states by introducing a longitudinal field and observe the emergence of strong non-rephasing like signals. To interpret the observed phenomena, we use a two-kink approximation to perturbatively compute the 2D spectra. We find good agreement in comparison with the exact results of the infinite matrix-product state method in the strongly confined regime. We discuss the relevance of our results for quasi$-$1D Ising spin chain materials such as $\mathrm{CoNb}_2\mathrm{O}_6$.
