Ashvin Vishwanath (Harvard University)
Thu. March 25th, 2021, 4:00 pm-5:00 pm
Quantum Magic in Moiré Lattices
The remarkable properties of electrons moving through crystalline lattices, which brought us the semiconductor electronics revolution, continue to surprise us. Recently, electrons in artificial Moiré lattices have emerged as an extraordinary new platform. The simplest such moire material consists of a pair of graphene sheets twisted relative to one another. At a “magic” angle of about 1 degree, a variety of phenomena, including strong-coupling superconductivity, is observed. In this talk, I will review this rapidly moving field and describe our theoretical ideas that invoke the geometry of quantum states and topological textures like skyrmions. Finally, I will explain how these insights pointed us towards a new family of Moiré superconductors, twisted trilayer graphene, which is currently under active experimental study.