Two-dimensional coherent spectrum of interacting spinons from matrix product states

作者：Qi Gao, Yang Liu, Haijun Liao, Yuan Wan · 发表于：Physical review. B./Physical review. B · 年份：2023 · DOI：10.1103/physrevb.107.165121 · 被引用次数：18 · 研究领域：Quantum many-body systems、Spectroscopy and Quantum Chemical Studies、Quantum and electron transport phenomena

We compute numerically the second- and third-order nonlinear magnetic susceptibilities of an Ising ladder model in the context of two-dimensional coherent spectroscopy by using the infinite time-evolving block decimation method. The Ising ladder model couples a quantum Ising chain to a bath of polarized spins, thereby effecting the decay of spinon excitations. We show that its third-order susceptibility contains a robust spinon echo signal in the weak-coupling regime, which appears in the two-dimensional coherent spectrum as a highly anisotropic peak on the frequency plane. The spinon echo peak reveals the dynamical properties of the spinons. In particular, the spectral peak corresponding to the high-energy spinons, which couple to the bath, is suppressed with increasing coupling, whereas those corresponding to low-energy spinons do not show any significant changes.