Abastract：We investigate the quantum dynamics of the antiferromagnetic transverse field Ising model on the triangular lattice through large-scale quantum Monte Carlo simulations and stochastic analytic continuation. This model effectively describes a series of triangular rare-earth compounds, for example, TmMgGaO4. At weak transverse field, we capture the excitations related to topological quantum strings, which exhibit continuum features described by XY chain along the strings and those in accord with ‘Luttinger string liquid’ in the perpendicular direction. The continuum features can be well understood from the perspective of topological strings. Our study provides characteristic features for the experimental search for string-related excitations and proposes a theoretical method to pinpoint topological excitations in the experimental spectra.

主讲人简介：张学锋，重庆大学物理学院教授、海外高层次青年人才。2011年博士毕业于中国科学院理论物理研究所，随后分别在德国Kaiserslautern大学和马普复杂系统物理所从事博士后研究。长期关注于量子多体系统的研究，包括强关联量子系统，超冷原子光晶格系统，量子非平衡问题，量子测量等方向。目前已发表论文25篇（含9篇PRL）。