Exploring Moiré 2D Materials and Topological Quasicrystals
PCS Institute for Basic Science via YouTube
Overview
Delve into the fascinating world of moiré 2D materials and topological quasicrystals in this comprehensive tutorial talk. Gain a theoretical perspective on the exceptional electronic properties that emerge when distinct 2D materials with varying periodicities are overlaid, creating moiré interference patterns. Explore the fundamental long-range continuum model, essential for describing electronic characteristics in systems like twisted bilayer graphene (TBG), graphene/hBN superlattices, and twisted topological insulators. Discover recent theoretical advancements in moiré systems beyond TBG, with a focus on trilayer systems where multiple moiré patterns interfere to create quasiperiodic structures. Examine the twist-angle-dependent electronic spectrum, which exhibits fractal minigaps reminiscent of the Hofstadter butterfly, and learn about their distinct topological numbers expressed as second Chern numbers through a connection with the quantum Hall effect in four-dimensional space.
Syllabus
Mikito Koshino: Exploring Moiré 2D Materials and Topological Quasicrystals
Taught by
PCS Institute for Basic Science