【理學論壇暨物理系專題演講】

【主講者】Dr. Mei-Yin Chou 周美吟 院士/特聘研究員
                 中央研究院原子與分子科學研究所 Institute of Atomic and Molecular Sciences, Academia Sinica

【講題】Moiré Physics in Graphene Layers – What’s the “Magic”?

【演講時間】2026/10/2(五) 14:10

【演講地點】理學教學大樓1樓36102室

【演講摘要】
The unexpected discovery of superconductivity and strong electron correlation in twisted bilayer
graphene, a system composed solely of 𝑠-𝑝 electrons, stands as one of the most intriguing
developments in two-dimensional materials in recent years. A key feature of this system is the
emergence of flat energy bands near the Fermi level (a condition that promotes the formation of
novel many-body phases) at the so-called “magic angles.” Gaining a deeper understanding of
the physical origin of these flat bands is essential for constructing an effective theory of
unconventional electron correlation. In this talk, I will present our recent theory on the origin of
these magic angles in twisted graphene layers and their connection to the Fermi ring in
AA-stacked multilayer graphene. In addition, I will discuss our first-principles study of lattice
relaxation effects in twisted bilayer graphene and the electron-phonon coupling in the
AA-stacked region.