主讲人：姚望，香港大学讲座教授
时 间：2026年10月27日10:00
地 点：物电学院A栋334
联系人：童庆军
讲座摘要：The fractional quantum Hall effect was initially discovered in a two-dimensional electron gas subjected to a strong magnetic field, which quantizes the kinetic energy of the electrons into discrete, highly degenerate Landau levels (LL). Its extension beyond the LL paradigm was first made possible by noting the topological equivalence of Chern bands in crystals to LLs, which can be further engineered in the isolated flat band limit to mimic LLs both in energy landscape and in quantum geometry. This has led to the ground breaking discovery of fractional Chern insulators at zero magnetic field. We will show concrete examples to go beyond the Chern band and LL paradigm, and present findings in lattice models that demonstrate fermionic and bosonic Laughlin and Moore-Read states in exact flat bands where band topology is trivial, critical, or ill-defined. A key observation underlying these expected emergence of the fractional states is that the interacting carriers in the flat band can self-adapt to the quantum metric landscape, tending to occupy regions with favorable quantum geometry, albeit the trivial or ill-defined band topology.
主讲人简介：姚望，香港大学理学院物理学系讲座教授。2001年在北京大学获得学士学位，2006年在美国加州大学圣地亚哥分校获得物理学博士学位。姚望教授是凝聚态物理及量子材料研究领域的国际知名学者，目前的研究集中在原子厚度的新兴二维材料及其异质结。他的工作开启了一个重要的研究方向：二维材料中的能谷光电子学，着眼于利用电子的能谷量子自由度来革新光电子器件的功能。姚望教授获得2023年中国物理学会黄昆物理奖，入选腾讯“新基石研究员项目”；2021年获得科学探索奖和仁科纪念基金会仁科芳雄亚洲奖；2014年由全球华人物理与天文学会颁发的亚洲成就奖；此外，亦获得香港裘槎基金会在2013年颁发裘槎前瞻科研大奖和2020年的裘槎高级研究学者。姚望教授是美国物理学会会士及美国光学学会会士。
