Ferromagnetism and quantum anomalous Hall effect in moire materials

Date: 
09/06/2019 - 3:30pm to 5:00pm
Speaker(s) / Presenter(s): 
Cécile Repellin, CNRS-Grenoble

The discovery of correlated insulators and high temperature superconductivity in magic angle twisted bilayer graphene in 2018 has spurred the intense scrutiny of various moire materials. These are generically obtained by stacking a few layers of atomically-thin 2D material (typically graphene), to create a superlattice with very large lattice constant. The ability to engineer moire materials with microscopic control make them extraordinarily promising platforms to realize a large variety of strongly correlated quantum phases. In turn, uncovering the microscopic mechanisms underlying their phenomenology is a pressing goal. In this talk, I will present some of the phenomena occurring in moire materials. Focusing on the correlated insulator behavior, I will explain the origin of ferromagnetism and quantum anomalous Hall effect in moire materials which are both observed in experiments. The existence of this phase opens the possibility to realize even more exotic quantum phases, such as the fractional quantum Hall effect in the absence of a magnetic field.

 

Host: Ribhu Kaul

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