报告人：涂鸿浩 教授（德国慕尼黑大学）

题目：Projected bosonic Gaussian wave functions for quantum magnets

时间：2026年8月26日（周三）下午15：00

地点：理工楼1226

联系人：赵继泽

报告摘要：

Bosonic Gaussian states provide a unified framework for variational descriptions of quantum magnets, encompassing wave functions derived from spin-wave theory as well as Schwinger-boson resonating-valence-bond (RVB) states. Despite their long history, quantitative studies of the corresponding projected wave functions have remained challenging because of the computational complexity associated with bosonic permanents and hafnians.

In this talk, I will introduce a recently developed tensor network approach that converts bosonic Gaussian states into matrix product states, enabling efficient calculations of large-scale projected bosonic wave functions. I will discuss applications of this approach to several paradigmatic quantum spin systems, including projected spin-wave states and one-dimensional bosonic RVB states. The results reveal that projection can dramatically modify the low-energy physics encoded in the underlying Gaussian states, ranging from enhanced magnetic order to the emergence of symmetry-protected topological phases. These developments bring projected bosonic Gaussian states into the modern tensor network variational toolbox for studying strongly correlated quantum systems.

个人简介：

2003年本科毕业于武汉大学物理学基地班，2009年获清华大学物理系博士学位。此后先后在德国马普量子光学研究所和慕尼黑大学从事博士后研究，2017—2023年任德累斯顿工业大学W1 Junior Professor（关联电子与拓扑），2023年至今任慕尼黑大学W2 Professor（理论凝聚态物理）。主要从事凝聚态理论研究，研究方向集中于强关联量子多体体系中的拓扑量子物态与量子临界现象，并发展了张量网络、共形场论和可解模型等解析与数值方法，在Physical Review Letters、Physical Review B等国际期刊发表论文70余篇。