Engineering Correlated Physics in Two-Dimensional Moire Superlattices

Event Date:
2019-03-21T16:00:00
2019-03-21T17:00:00
Event Location:
Hennings 201
Speaker:
Feng Wang (Berkeley)
Related Upcoming Events:
Intended Audience:
Undergraduate
Local Contact:

Ziliang Ye

Event Information:

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 tunable Mott insulator realized in the ABC trilayer graphene (TLG) and hexagonal boron nitride (hBN) heterostructure with a moiré superlattice, where the moiré 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 1/4-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.

Add to Calendar 2019-03-21T16:00:00 2019-03-21T17:00:00 Engineering Correlated Physics in Two-Dimensional Moire Superlattices Event Information: 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 tunable Mott insulator realized in the ABC trilayer graphene (TLG) and hexagonal boron nitride (hBN) heterostructure with a moiré superlattice, where the moiré 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 1/4-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. Event Location: Hennings 201