We present a simple derivation of a continuum Hamiltonian for bilayer graphene with an arbitrary smooth lattice deformation -- technically in a fashion parametrized by displacement fields with small gradients. We show that this subsumes the continuum model of Bistritzer and Macdonald for twisted bilayer graphene as well as many generalizations and extensions of it. The derivation is carried out entirely in real space.
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- 1 2 Leon Balents
- 1 Institut Canadien de Recherches Avancées / Canadian Institute for Advanced Research [CIFAR/ICRA]
- 2 Kavli Institute for Theoretical Physics [KITP]