Speaker
Description
Moiré superlattices have been demonstrated as an ideal platform for investigating novel superconductivity and topological phases in the flatband limit. In this talk, I will mainly present two complementary experiments to demonstrate the importance of the quantum metric and quantum phase fluctuations in stabilizing flatband superconductivity in alternating twisted graphene multilayers. I will quantify the flat-band Fermi velocity and superfluid stiffness, and discuss the Dirac band’s contribution to the flatband superconductivity. I will also discuss the bosonic superconductor-insulator quantum phase transition and highlight the importance of quantum phase fluctuations. (If time permits, I will talk about integer and fractional Chern insulators in high Chern number flat bands.)