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Simplified model of topological flat bands and valley polarization in twisted bilayer graphene

Paper Authors:

Yang-Zhi Chou,

Yuting Tan,

Fengcheng Wu,

Sankar Das Sarma

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Key Details

Develops model of magic-angle TBG with proximity-induced spin-orbit couplings

Demonstrates topological flat bands and distinct topological phases

Finds valley polarization emerges, suppressing conventional superconductivity

Uncovers observable interband superconductivity can coexist with valley imbalance

Reveals route to realizing unusual superconductivity

AI generated summary

Simplified model of topological flat bands and valley polarization in twisted bilayer graphene

This paper develops a theoretical model of magic-angle twisted bilayer graphene with proximity-induced spin-orbit couplings. It demonstrates topological flat bands and identifies distinct topological phases. Through analysis, the model finds that valley polarization emerges over a range of parameters, suppressing conventional superconductivity relying on time-reversal symmetry. Remarkably, the model uncovers that observable unconventional interband superconductivity can coexist with valley imbalance when flat bands enable approximate Fermi surface nesting. This reveals a route to realizing unusual superconductivity.

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