Speaker
Description
Recent advances in moiré materials have revealed that twisted structures provide a versatile platform for engineering electronic structures and emergent quantum phenomena through geometry alone. Beyond the extensively studied flat-band physics in simple bilayer moiré systems, recent developments in anisotropic and multilayer structures have opened qualitatively new directions in moiré quantum matter.
In this talk, I will discuss several theoretical developments that extend moiré physics beyond conventional two-dimensional bilayer superlattices. I will first introduce one-dimensional moiré systems realized in anisotropic twisted materials and graphene nanoribbon heterostructures. In these systems, the interplay between moiré modulation and lattice relaxation can generate quasi-one-dimensional electronic structures, domain patterns, and localized states, providing a new route to engineering dimensionality in moiré materials.
I will then turn to twisted multilayer systems, where multiple competing moiré patterns coexist. Their interference and lattice relaxation give rise to “moiré-of-moiré” structures on length scales much larger than the original moiré period, accompanied by spontaneous domain formation, emergent electronic states, and topological channels. These examples illustrate how increasing structural complexity can generate new effective geometries that have no counterpart in simple bilayer systems.