Mapping flat bands and correlated states in twisted trilayer graphene
ORAL
Abstract
The twist angle between two van der Waals layers is a powerful tuning knob to engineer electronic band structure. In the limit of small interlayer twist, hybridization between layers can produce flat electronic bands, whereas a large twist angle leads to more decoupled layers. In this talk, I will discuss measurements of twisted trilayer graphene which realizes both flat and dispersive bands. We conduct electronic compressibility measurements with a scanning single electron transistor (SET) microscope to locally map how the band structure evolves as the inter-layer twist angles vary in space. We discover a range of “magic” angles for which electronic interaction effects are prominent for electrons and holes, respectively, leading to correlated phases at both low and high magnetic fields. I will discuss how these results clarify the role of interlayer twist in stabilizing distinct ground states in twisted graphene multilayer systems.
*This work was supported by the QSQM, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES). Z.Z. is supported by a Stanford Science Fellowship.
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Presenters
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Jesse Hoke
- Stanford University