通知公告

报告题目：Massive excitation spectra in quasi-one-dimensional Antiferromagnets Sr/BaCo2V2O8

报告摘要：

In a one-dimensional (1D) antiferromagnetic spin-1/2 chain, the elementary excitation is a continuum of two spinons—fractionalized quasiparticles responsible for spin fluctuation. Spinons behave as a Tomonaga–Luttinger liquid at low energy and serve as rich resources in quantum metrology. Recently, there has been considerable interest in confining such quasiparticles in spin-1/2 Ising-like quasi-1D antiferromagnets, leading to exotic emergent E8 massive spectra in CoNb2O6 and BaCo2V2O8.

In this talk, I first briefly discuss the historical development of interest in confined and deconfined spin kinks. I then present a detailed many-body perturbation theory for analytically calculating the spin dynamical structure factor (DSF) of confined quasiparticles in two quasi-1D compounds (Sr/BaCo2V2O8), which shows good overall agreement with experimental data. At low energy, the DSF-described by Green’s functions of short spin-kink lengths encoding multiple spin scatterings—closely resembles the E8 spectrum in sharp modes. While these sharp modes align with E8 quantum field theory, this theory fails to reproduce DSF spectral weights in real materials, as it neglects multi-particle scattering from complex inter- and intra-chain interactions. Our approach rigorously describes confined spin kinks in spin-chain materials and opens routes for exploring dynamical properties in realistic non-integrable compounds.

个人简历：

管习文, 中国科学院精密测量科学与技术创新研究院（APM）研究员，美国物理学会会士。1998年吉林大学博士毕业后在德国和巴西从事博士后研究。2003-2012期间在澳⼤利亚国立大学（ANU）物理与工程研究院任研究员、高级研究员，2012年10月回国在APM担任研究员和教授。自2016任ANU的荣誉教授，也是美国哈佛大学、洛斯阿拉莫斯国家实验室等世界一流研究机构的高级访问学者,清华大学高等研究院客座教授，香港中文大学杨振宁访问学人。自2013年回国来，5次担任科技部及国家自然基金重点项目首席，并获得精密测量研究院4次科技突破奖，2022年获得杰出人才奖。2024年获得湖北省自然科学⼀等奖。管习文长期从事冷原子少体和多体物理系统和自旋系统的严格解以及精密测量理论的研究，多项理论预言得到实验验证。 至今发表160余篇SCI论文，包括《Science》、《Review of Modern Physics》、《Nature》子刊、《Physical Review Letters》等。