Tunable correlated and topological physics in ABC-trilayer graphene on hBN moiré superlattices
Invited
Abstract
Two-dimensional materials and their Van der Waals heterostructures are highly tunable and provide an exciting platform to design, create and study novel electronic properties. In this talk, I will take graphene as an example to show how we engineer the electronic properties and experimentally observe the strongly correlated and topological phenomenon in a piece of ABC-trilayer graphene on hBN moiré superlattice. In particular, I will start with a general route to engineer strongly correlated physics in two-dimensional moiré superlattices, and show the experimental realization of a tunable Mott insulator and superconductor in the ABC-trilayer graphene/hBN moiré superlattice. By simply tuning the gate voltages, the large anomalous Hall signals are observed at certain fillings of the topological flat band, and a clear topological Chern insulator is observed at 1/4 filling. Our results demonstrate that ABC-trilayer graphene/hBN moiré superlattice is a very interesting system hosting Mott, superconductivity and topological physics.
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Presenters
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Guorui Chen
University of California at Berkeley, Berkeley, Shanghai Jiao Tong University
Authors
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Guorui Chen
University of California at Berkeley, Berkeley, Shanghai Jiao Tong University