Integrability in the chiral model of magic angles
Mathematical Physics
2023-06-02 v3 Materials Science
Strongly Correlated Electrons
math.MP
Spectral Theory
Quantum Physics
Abstract
Magic angles in the chiral model of twisted bilayer graphene are parameters for which the chiral version of the Bistritzer--MacDonald Hamiltonian exhibits a flat band at energy zero. We compute the sums over powers of (complex) magic angles and use that to show that the set of magic angles is infinite. We also provide a new proof of the existence of the first real magic angle, showing also that the corresponding flat band has minimal multiplicity for the simplest possible choice of potentials satisfying all symmetries. These results indicate (though do not prove) a hidden integrability of the chiral model.
Cite
@article{arxiv.2208.01620,
title = {Integrability in the chiral model of magic angles},
author = {Simon Becker and Tristan Humbert and Maciej Zworski},
journal= {arXiv preprint arXiv:2208.01620},
year = {2023}
}
Comments
Simplification and strenghtening of trace formula