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Strong electron-electron correlations in quantum many-body system can result in many intriguing phases. In recent years, various strongly correlated phases have been observed in magic-angle twisted graphene systems, where the isolated flat band is achieved at zero magnetic field. The excellent tunability (e.g., E-field, B-field, stacking orders, etc.) of the twisted graphene systems make it be an ideal platform to study the strongly correlated phenomena. In this talk, I will present a novel device geometry, where the magic-angle twisted graphene and a Bernal bilayer graphene (BLG) are separated by an insulating barrier with thickness of 2 ~ 3 nm. By using charge screening from the BLG, the strength of Coulomb interaction within the magic-angle twisted graphene can be continuously tuned. On the other hand, such double layer structure could enable us to further probe the thermodynamic properties of the moiré flat band. Our findings not only provide important constraints on theoretical models for understanding the nature of superconductivity in twisted graphene systems, but also pave the way for realizing more exotic phases based on the platform of moiré superlattice.
Xiaoxue Liu got her PhD in 2018 from Peking University, under the supervision of Prof. Rui-Rui Du. She is currently a postdoctoral researcher at Brown University working with Prof. Jia Leo Li. Her research interest is to explore and understand exotic quantum phases of matter based on low-dimensional materials, such as twisted graphene moiré systems and 2D semiconductor quantum wells. The research topics include strongly correlated phases, superconductivity, exciton condensation and fractional quantum hall states.
Tencent Meeting Link: https://meeting.tencent.com/dm/yD55Ml2OBt9r
Meeting ID: 239 241 910 Password: 123456