Strain shifts the angle of flattest bands, broadens flat bands roughly linearly, and can switch their valley topology from ±1 to 0, with shear strain acting more strongly than uniaxial.
Moir\'e-driven equilibrium of perturbations in moir\'e systems
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abstract
Perturbations in moir\'e materials, such as due to substrates or strain, are common in many experiments and can significantly modify the electronic properties of the system. Here, we show that perturbations in twisted bilayer graphene tend to be transferred between the coupled Dirac cones, eventually reaching an equilibrium near the magic angle. We connect our results to experiments and show that this equilibrium behavior remains robust even when the moir\'e potential itself is perturbed. Our findings extend the notion of the magic angle to a more general regime governed by moir\'e-driven equilibrium.
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cond-mat.mes-hall 1years
2026 1verdicts
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Straintronics and twistronics in bilayer graphene
Strain shifts the angle of flattest bands, broadens flat bands roughly linearly, and can switch their valley topology from ±1 to 0, with shear strain acting more strongly than uniaxial.