Controlled loop expansion in strained MATBG reveals U(1) symmetry suppressing Mott band linewidths at order s² and predicts strain-induced kinks plus a flat trion band, with one-loop QTM spectra compared to experiment.
Interplay between many-body correlations, strain and lattice relaxation in twisted bilayer graphene
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abstract
In twisted bilayer graphene, a unified understanding of the mechanisms governing temperature-dependent electronic spectra and thermodynamic properties remains controversial despite extensive theoretical efforts. Here, we present a comprehensive theoretical framework that quantitatively accounts for scanning tunneling spectroscopy, quantum twisting microscopy, and thermodynamic properties of magic angle twisted bilayer graphene. We demonstrate that the observed behavior arises from the interplay between electron correlations and external symmetry-breaking induced by strain and lattice relaxation. These effects act cooperatively to shape the emergent electronic behavior, leaving characteristic signatures across spectroscopy, compressibility and entropy.
fields
cond-mat.str-el 2years
2026 2verdicts
UNVERDICTED 2representative citing papers
A loop expansion in the topological heavy fermion model yields quasiparticle lifetimes and a Curie-Weiss flavor susceptibility above the ordering temperature despite strong interactions.
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Controlled Loop Expansion for Strained Twisted Bilayer Graphene
Controlled loop expansion in strained MATBG reveals U(1) symmetry suppressing Mott band linewidths at order s² and predicts strain-induced kinks plus a flat trion band, with one-loop QTM spectra compared to experiment.
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Controlled Loop Expansion for the Topological Heavy Fermion Model
A loop expansion in the topological heavy fermion model yields quasiparticle lifetimes and a Curie-Weiss flavor susceptibility above the ordering temperature despite strong interactions.