Graphene bilayers with a twist

By E. Andrei, Allan H. MacDonald. Nature Materials, 2020

858 citations recorded by the source corpus.

Near a magic twist angle, bilayer graphene transforms from a weakly correlated Fermi liquid to a strongly correlated two-dimensional electron system with properties that are extraordinarily sensitive to carrier density and to controllable environmental factors such as the proximity of nearby gates and twist-angle variation. Among other phenomena, magic-angle twisted bilayer graphene hosts superconductivity, interaction-induced insulating states, magnetism, electronic nematicity, linear-in-temperature low-temperature resistivity and quantized anomalous Hall states. We highlight some key research results in this field, point to important questions that remain open and comment on the place of magic-angle twisted bilayer graphene in the strongly correlated quantum matter world. Magic-angle twisted bilayer graphene plays host to many interesting phenomena, including superconductivity. This Review highlights key research results in the field, points toward important open questions, and comments on the place of magic-angle twisted bilayer graphene in the strongly correlated quantum matter world.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/4cf64695056fa3f457ebcdbcd9de87910cffb742

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In Atomic and Molecular Physics, and Optics

In Materials Chemistry

Citations in the corpus

Colloquium : Quantum anomalous Hall effect (2022, background): “TBG therefore normally has a quantum valley Hall effect (Andrei and MacDonald, 2020; Li et al., 2016a, 2018; Liu and Dai, 2021a; Liu et al., 2019c; Martin et al., 2008; Xiao et al., 2007), opposite QH effect contributions from opposite valleys, at neutrality but not when the Fermi level lies in…”
Superconductivity, superfluidity and quantum geometry in twisted multilayer systems (2021, neutral): “∑ ∑ H c K c = (5) α β σ ασ α β σ βσ i j i i j j 0 , , ̂ ̂ ̂ †”
High-temperature topological superconductivity in twisted double-layer copper oxides (2020, background): “As such, many aspects of the reported experimental observations in twisted graphene and WSe2 still await full theoretical understanding [18].”
Applications of bound states in the continuum in photonics (2023, background): “…moiré superlattices, based on twisted or lattice-mismatched van der Waals heterostructures, pre-sent a new class of electronic material 237,238 with interesting properties such as flat bands, correlated states and moiré excitons, which have inspired investigations into the use of moiré…”
Quantum states and intertwining phases in kagome materials (2023, background): “These phases have been observed in strongly correlated systems, such as heavy fermion materials, high-temperature superconductors, complex oxide perovskites, transition metal dichalcogenides and twisted graphene 3,5–8 .”