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Condensed Matter / Biophysics Seminar – Jia Leo Li, Brown University
Engineering graphene moire structures using proximity effect
The discovery of magic-angle twisted bilayer graphene marks the beginning of a new chapter in quantum science research and material engineering in the 2D limit. In a short 2-3 years, a wide variety of material properties and novel physical constructions are realized in different moire structures, which cover almost all functionalities of solid-state systems including Mott-like insulators, superconductors, ferro- and antiferromagnets. In this talk, I will discuss a new method to engineer the band structure and associated emergent phenomena in graphene moire structures using proximity effect. I will describe two different types of proximity effect: proximity Coulomb screening and proximity-induced spin-orbit coupling (SOC). For example, SOC can be introduced into the moira flatband by creating an atomic interface between magic-angle twisted bilayer graphene and a tungsten diselenide crystal. I will show that proximity induced SOC not only modifies the energy band structure, but it also provides novel experimental knobs to probe and control the ground state order. In addition, I will discuss the influence of proximity effect in twisted trilayer graphene structures.
Host: Xiao-XIao Zhang