The colloquium will be streamed online.
Prof. Cory Dean, Columbia University
Invited by Prof. Dmitri Efetov
Superconductivity in twisted bilayer and twisted trilayer graphene results from an interplay between interlayer coupling and a moiré superlattice that gives rise to low-energy flat bands with strong correlations. Similar flat bands have been explored in lattice-mismatched and or twisted heterostructures of other two-dimensional materials beyond graphene such as transition metal dichalcogenides (TMDs). However, despite a wide range of correlated phenomenon robust demonstration of superconductivity in the TMDs remained absent and its possibility an open question. In my talk I will present our recent observation of superconductivity in twisted bilayer WSe2, appearing adjacent to a magnetic ordering state. The ability to vary the twist angle provides a unique capability to modulate the interacting strength in this system and in recent experiments we observe a systematic evolution of the magnetic and superconducting phases. I will discuss our current understanding of the phase space of correlated states in this moire system, and how this relates to conventional examples of unconventional superconductors.