物理学院学术报告（第78期）

报告题目：Moiré physics in ultracold atomic gases

报告专家：高超 教授    浙江师范大学

报告时间：2024年11月07日（周四）10:00

报告地点：理6栋302      邀请人：张善超

报告内容：

Moiré physics has flourished since the realization of twisted bilayer graphene at magic angles. Thanks to the high controllability and clean environment, ultracold atoms are ideal platforms for studying moiré physics. In this talk, I will present our recent progress in this direction. Using spin-dependent optical lattices for Rb87, Jing Zhang's group at Shanxi University first realized the moiré lattice in 2023. Our theoretical analysis contributed to explaining the new phases found in the experiment. Recently, we have further investigated the single-particle energy spectrum as a function of the twisting angle. We find beautiful fractal patterns and explained such behaviors by mapping the twisted bilayer optical lattice into an extended Hofstadter model. We have also extended the moiré physics to three dimensions. The non-Abelian nature of 3D rotation enables various crystal structures generated by twisting a simple cubic lattice. This capability of changing crystal structure by twist offers a broad range of tunability of band dispersion, including topological or flat bands, which can lead to richer few-body and many-body effects after adding interactions.

专家简介：

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。主要致力于量子模拟和冷原子物理的理论研究，在量子少体散射、多体动力学、莫尔晶格方面做出了系列工作。迄今发表了多篇高水平SCI论文，其中包括Nature一篇，Physical Review Letters四篇，Physical Review X一篇，他引700余次。主持国家自然科学基金面上项目和青年项目、浙江省人才项目等。