学术报告（6月21日 星期四 16:00-17:30）

主持人：姚道新 副院长 、邬汉青 副教授

欢迎广大师生前来参与！

【报告摘要】 In the past few years, a lot of progress has been made in classifying topological phases in strongly correlated systems, including interacting topological insulators and topological paramagnets. Recently, much attention has been drawn to the phase transitions between these topological phases. These transitions are beyond the Landau-Ginzberg paradigm, as no local order parameter can be written down. We show that fractionalized degrees of freedoms emerge at these topological transitions, making these critical points effectively like quantum spin liquids. In particular, I will discuss two transitions: a topological transition between bosonic symmetry protected topological (SPT) phases and a Dirac semimetal - Mott insulator transition that appears at a tricritical point among SPT phases. We propose the effective field theories at these critical points, which is in parallel with the theoretical progress of field theory duality. Out theory also predicts the explicit signatures of these exotic phase transitions that can be detected in inelastic neutron scattering (INS), nuclear magnetic resonance (NMR) and resonant inelastic X-ray scattering (RIXS).

【个人简介】尤亦庄，现为加州大学圣地亚哥分校（UCSD）助理教授。2008年本科毕业于南京大学，2013年博士毕业于清华大学，后在美国Kavli理论物理研究所（KITP）及哈佛大学从事博士后研究工作至2018年，然后在加州大学圣地亚哥分校（UCSD）工作。主要研究领域是量子多体物理，关注集体行为导致的演生现象、拓扑物理、临界现象，对信息论（特别是量子信息），复杂系统，人工智能等领域也很感兴趣。