02/28
2023
Seminar
- Title题目 Kibble-Zurek Mechanism in Holography
- Speaker报告人 张海青 (北京航空航天大学)
- Date日期 2023年02月28日 10:00
- Venue地点 南楼6620; 腾讯会议号：373-472-179
Abstract摘要
Kibble-Zurek mechanism was vastly studied in condensed matter physics to investigate the formation of topological defects during a course of phase transition which is induced by spontaneous symmetry breaking. Various experiments have verified this mechanism in various systems. However, whether the Kibble-Zurek mechanism still works in strongly coupled systems is still unknown or lack of theoretical foundations. Therefore, we resort to the AdS/CFT correspondence, which can holographically study the strongly coupled physics from the weakly coupled gravity. In this talk, I will briefly review our recent work on the holographic applications of Kibble-Zurek mechanism in diverse dimensional systems, in particular 1+1 and 2+1 dimensions. We will see strikingly different natures for holographic superfluids and holographic superconductors. Besides, different symmetry breaking will give rise to different types of defects. In this respect, I will mention our work on holographic kink formation and vortices formation which were resulted from discrete symmetry breaking and continuous symmetry, respectively.
报告人简介:
张海青，北京航空航天大学副教授，博士生导师。2012年博士毕业于中科院理论物理研究所，2012-2016年，先后在葡萄牙里斯本大学与荷兰乌特勒支大学做博士后，2016年底回北航任职。近年来，他的研究领域主要集中在引力全息原理在非平衡态中的应用，尤其在全息Kibble-Zurek机制方面做了一定的工作。他与合作者率先研究了拓扑缺陷在全息超导体中的形成，发现缺陷的数目满足Kibble-Zurek机制；但是，当规范场的贡献更大时，Kibble-Zurek机制将会被Flux-Trapping机制所取代，则拓扑缺陷就会形成同号的簇分布。这些研究为全息引力原理在非平衡态动力学中的应用提供了很好的验证，对于研究强耦合物理中的拓扑缺陷形成具有一定的借鉴意义。
邀请人 李理 研究员
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