论文标题
从二维相干光谱中提取Spinon自我能量
Extracting spinon self-energies from two-dimensional coherent spectroscopy
论文作者
论文摘要
二维相干光谱（2DC）是一种非线性光谱技术，能够识别线性响应中的明显连续性是否由尖锐的解质型准粒子的多重组制成。这使其成为实验鉴定分数阶段的有效工具。先前的讨论集中在限制上，其中所讨论的准颗粒寿命无限长。在本手稿中，我们在制度中讨论了分数化准粒子本身可以衰减的2DC。我们介绍了一种强大的基于路径积分的方法，从而计算非线性敏感性将减少到示意性扰动理论中的有效锻炼。我们将此方法应用于一维横向场ISING模型的2DC响应，在存在可集成性破坏的情况下。我们讨论了可以通过2DC提取的分数化准粒子的自能力的各个方面，例如动量依赖性衰减速率。
Two-dimensional coherent spectroscopy (2DCS) is a nonlinear spectroscopy technique capable of identifying whether apparent continua in linear response are made out of multiplets of sharp deconfined quasiparticles. This makes it a potent tool for experimental identification of fractionalized phases. Previous discussions have focused on limits where the quasiparticles in question are infinitely long lived. In this manuscript we discuss 2DCS in the regime where the fractionalized quasiparticles can themselves decay. We introduce a powerful path integral based approach, whereby the computation of nonlinear susceptibilities reduces to an efficient exercise in diagrammatic perturbation theory. We apply this method to compute the 2DCS response of the one-dimensional transverse field Ising model, in the presence of integrability-breaking perturbations. We discuss aspects of the self-energy of the fractionalized quasiparticles that may be extracted via 2DCS, such as the momentum-dependent decay rate.
