题目：Moire lattices for cold atoms: many-body phases and wavepacket dynamics

报告人：高超 教授（浙江师范大学）

地点：紫金港校区西区海纳苑8幢323教室

时间：2023年4月18日（周二），下午13:30

摘要：Moire or quasiperiodic lattices promise exciting physics for quantum systems. A typical example is the one realized by twisted bilayer graphene (TBG) with a magic angle, which supports flatband and exotic superconductivity. In order to explore the intrinsic universal mechanism with a high degree of control over the system parameters, ultracold atoms can be utilized to construct those lattices. Recently, a counterpart realization of TBG in cold atoms was reported [1]. In this system, two internal spin components are taken as the two synthetic layers, and lattice potentials with a twisted angle are applied respectively. When bosonic atoms are loaded, several different many-body equilibrium phases can be found. In the first part of this talk, I will discuss the physics behind it. In the second part, I will discuss wavepacket dynamics in another quasiperiodic lattice, which supports multifractal wavefunctions. We find peculiar return and subdiffusive behaviors therein.

[1] Meng et al, Nature 615, 231 (2023), Atomic Bose–Einstein condensate in twisted-bilayer optical lattices.

个人简介：高超 浙江师范大学物理系教授。2010年毕业于北京师范大学并获得物理学学士学位；2015年毕业于清华大学高等研究院并获得物理学博士学位。主要致力于超冷原子物理的理论研究，在量子少体散射和多体动力学方面做出了系列贡献，相关工作揭示了超级Efimov效应的量子起源，预言了量子动力学分形结构，解释了幺正玻色气体的预热化普适行为等。迄今发表了多篇高水平SCI论文，其中包括Nature一篇，Physical Review Letters三篇，Physical Review X一篇，他引600余次。主持国家自然科学基金面上项目和青年项目、浙江省自然科学基金杰出青年项目等，并入选首批“浙江省高校领军人才培养计划”。

欢迎老师和同学参加！