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【预告】复旦大学戚扬教授：Emergent U(1) symmetry and ...
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此讲座由中国科学院卡弗里理论科学研究所主办，于2020年11月09日14:00开始，授权蔻享学术进行网络直播。
主题：Emergent U(1) symmetry and Berezinskii-Kosterlitz-Thouless transition in a triangular-lattice quantum Ising material TmMgGaO4
主讲人：戚扬 教授
单位：复旦大学
主办方：中国科学院卡弗里理论科学研究所
报告摘要
The low-energy physics of TmMgGaO4 is described by a triangular-lattice transverse-field antiferromagnetic Ising model. We determine a low-energy effective model for the material by comparing quantum many-body numerical simulations and experimental results. This model has an emergent U(1) symmetry and two Berezinskii-Kosterlitz-Thouless (BKT) transitions at finite temperatures, which bounds a BKT phase with quasi-long-range spin-spin correlations. Inspired by studies of BKT transitions in 2D superfluids, we study spin-lattice relaxation times in nuclear magnetic resonance (NMR) experiments, and observed a plateau in 1/T1, which can be attributed to the low-energy excitations in the BKT phase. The experimental findings can be explained by quantum Monte Carlo simulations applied on our effective model. These results provide a concrete example for the BKT phase and offer an ideal platform for future investigations on the BKT physics in magnetic materials.
报告人简介
编辑：冯春丽
●【期刊】最新出版 | 2020年 第26卷 第3期 | 上海大学学报
●【期刊】青年科学评述 | 里德堡原子多体相互作用的研究进展 | 物理学报
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