Anderson's Theorem for Correlated Insulating States in Twisted Bilayer Graphene

Kryštof Kolář, Gal Shavit, Christophe Mora, Yuval Oreg, Felix von Oppen

Research output: Contribution to journalArticlepeer-review

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 moiré flat bands. We find that the K-IVC gap is robust against local perturbations, which are odd under PT, where P and T denote particle-hole conjugation and time reversal, respectively. In contrast, 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.
Original languageEnglish
Article number076204
Number of pages6
JournalPhysical review letters
Volume130
Issue number7
DOIs
StatePublished - 17 Feb 2023

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