Speaker
Description
In recent years a plethora of new correlated states have been observed by stacking and twisting two-dimensional van der Waals materials of different kind. Some prominent examples are twisted bilayer graphene, bilayer heterostructures of graphene with the spin-orbit assisted Mott insulator α-RuCl3 -a candidate for Kitaev spin physics-, or bilayer heterostructures of the Mott insulator 1T-TaS2 with the metal 1H-TaS2. Unique to these bilayer structures is the emergence of phases such as heavy fermions, quantum spin liquids, correlated metals, or topological superconductivity, not observed in the single layers alone.
In this talk I will discuss the microscopic modelling of such heterostructures by a combination of first-principles calculations, effective-model considerations and many-body techniques, and will present results on the emerging correlated electronic and magnetic properties that we compare with available experiments.