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- W4288055878 abstract "The emergence of correlated insulating phases in magic-angle twisted bilayer graphene exhibits strong sample dependence. Here, we derive an Anderson theorem governing the robustness against disorder of the Kramers intervalley coherent (K-IVC) state, a prime candidate for describing the correlated insulators at even fillings of the moir'e flat bands. We find that the K-IVC gap is robust against local perturbations, which are odd under $mathcal{PT}$, where $mathcal{P}$ and $mathcal{T}$ denote particle-hole conjugation and time reversal, respectively. In contrast, $mathcal{PT}$-even perturbations will in general induce subgap states and reduce or even eliminate the gap. We use this result to classify the stability of the K-IVC state against various experimentally relevant perturbations. The existence of an Anderson theorem singles out the K-IVC state from other possible insulating ground states." @default.
- W4288055878 created "2022-07-28" @default.
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- W4288055878 date "2022-07-22" @default.
- W4288055878 modified "2023-09-29" @default.
- W4288055878 title "Anderson's theorem for correlated insulating states in twisted bilayer graphene" @default.
- W4288055878 doi "https://doi.org/10.48550/arxiv.2207.11281" @default.
- W4288055878 hasPublicationYear "2022" @default.
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