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Abstract

AP470

Thursday, 6 December 2018 at 3:15 pm

McCullough, First Floor Auditorium, Room #115

 

Host:  Ben Feldman

 

Feng Wang

UC Berkeley

 

Engineering Correlated Physics in Two-Dimensional Moire Superlattices

Van der Waals heterostructures of atomically thin crystals offer an exciting new platform to design novel electronic and optical properties. In this talk, I will describe a general approach to engineer correlated physics using moire superlattice in two dimensional heterostructures. One example is the strong correlation realized in the ABC trilayer graphene (TLG) and hexagonal boron nitride (hBN) heterostructure, where the moiré superlattice leads to narrow electronic minibands and allows for the observation of gate-tunable Mott insulator states at 1/4 and 1/2 fillings. In addition, signatures of superconductivity are observed at low temperature near the ¼ filling Mott insulator state in the TLG/hBN heterostructures. Another example is the WS2/WSe2 heterostructure, where the moire superlattice leads to flat exciton subbands and emerging excitonic transitions.