Unconventional Ferroelectricity in Moiré Heterostructures*

The understanding of strongly-interacting quantum matter has challenged physicists for decades. The discovery six years ago of correlated phases and superconductivity in magic angle twisted bilayer graphene has led to the emergence of a new materials platform to investigate strongly interacting physics, namely moiré quantum matter. These systems exhibit a plethora of quantum phases, such as correlated insulators, superconductivity, magnetism, and more. In this talk I will review some of the recent advances in the field, focusing on the discovery of different types of unconventional ferroelectricity in novel moiré heterostructuresnewest. In particular I will discuss stacking engineered ferroelectricity in bilayer boron nitride systems, as well as a novel ferroelectricity of electronic origin. I will end the talk with an outlook of some exciting directions in this emerging field.