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 …

Strongly correlated systems can give rise to spectacular phenomenology, from high-
temperature superconductivity to the emergence of states of matter characterized by long …

Quantum particles on a lattice with competing long-range interactions are ubiquitous in
physics; transition metal oxides,, layered molecular crystals and trapped-ion arrays are a few …

The Hubbard model, formulated by physicist John Hubbard in the 1960s, is a simple
theoretical model of interacting quantum particles in a lattice. The model is thought to …

Interactions between electrons and the topology of their energy bands can create unusual
quantum phases of matter. Most topological electronic phases appear in systems with weak …

In narrow electron bands in which the Coulomb interaction energy becomes comparable to
the bandwidth, interactions can drive new quantum phases. Such flat bands in twisted …

The quantum anomalous Hall (QAH) effect combines topology and magnetism to produce
precisely quantized Hall resistance at zero magnetic field. We report the observation of a …

Studies of two-dimensional electron systems in a strong magnetic field revealed the
quantum Hall effect, a topological state of matter featuring a finite Chern number C and …

Twisted bilayer graphene near the magic angle,,–exhibits rich electron-correlation physics,
displaying insulating,,–, magnetic, and superconducting phases,–. The electronic bands of …

The recent discovery of correlated insulator states and superconductivity in magic-angle
twisted bilayer graphene, has enabled the experimental investigation of electronic …