主讲人：阴帅，中山大学副教授
时 间：2025年6月6日15:30
地 点：物电学院A栋316
联系人：李福祥
讲座摘要：Universal critical properties can manifest themselves not only in spatial but also in temporal directions. It has been found that critical point with emergent symmetry exhibits intriguing spatial critical properties characterized by two divergent length scales, attracting long-term investigations. However, how the temporal critical properties are affected by emergent symmetry is largely unknown. Here we study the nonequilibrium critical dynamics in the three-dimensional (3D) clock model, whose critical point has emergent U(1) symmetry. We find that in contrast to the magnetization M, whose relaxation process is described by the usual dynamic exponent z of the 3D XY universality class, the angular order parameter φq shows a remarkable two-stage evolution characterized by different dynamic critical exponents. While in the short-time stage the relaxation dynamics is governed by z, in the long-time stage the dynamics is controlled by a new dynamic exponent z′. Further scaling analyses confirm that z′ is an indispensable dynamic critical exponent. Our results may be detected in the hexagonal RMnO3 (R=rare earth) materials experimentally.
主讲人简介： 阴帅，2014年于中山大学获博士学位，随后在台湾清华大学、清华大学高等研究院从事博士后研究，2019年10月起任中山大学物理学院副教授、博导。获得国家自然科学基金优秀青年基金支持。主要研究方向为量子临界性和非平衡量子物态及其相变动力学，其团队在非厄米格点规范理论、解禁闭量子临界动力学等领域取得多项国际前沿成果。
