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Van der Waals heterostructures enable fabrication of materials with engineered functionalities. Here, the authors demonstrate precise control over the interaction between layers by application of pressure with a scanning tunnelling microscopy tip.

We report signatures of a generalized version of the anomalous Hall crystal in twisted bilayer–trilayer graphene, whose formation is driven by the moiré potential.

Interacting electrons in Hofstadter bands can form symmetry-broken topological states. These are now revealed in magic-angle twisted bilayer graphene, and their properties are influenced by non-uniform quantum geometry.

The topological properties of twisted bilayer MoTe₂ are thought to stem from a spatial texture in the layer polarization of the electronic wavefunctions. This polarization is now measured using scanning tunnelling microscopy.

Pressure-induced changes in the magnetic order of bilayer and trilayer van der Waals crystals are revealed and attributed to changes in the stacking arrangement.

Engineering multiple moiré patterns within a boron nitride–graphene–boron nitride heterostructure enables tunable crystal symmetry and strong modification of the graphene band structure.

Transport measurements on twisted bilayer graphene show that a large linear-in-temperature increase in resistivity exists for many twist angles. This may have implications for the mechanism of superconductivity in this material.

Twisted multilayer graphene structures composed of Bernal-stacked constituents are predicted to host flat moiré bands for several layer-number combinations. Here, the authors find an array of band insulators, correlated insulators, and topological states with notable similarities across different constructions.

Trilayer graphene can be realized in two different stacking configurations, known as rhombohedral and Bernal stackings, which display different electronic characteristics. It is now shown that an applied perpendicular electric field can be used to switch between these two configurations.

Measurements of the chemical potential in a monolayer of WSe₂ using a single electron transistor sensing scheme allows for the exact mapping of the level spacing of Landau levels of monolayer WSe₂ in the conductance and valence bands.

It is well known that graphene deposited on hexagonal boron nitride produces moiré patterns in scanning tunnelling microscopy images. The interaction that produces this pattern also produces a commensurate periodic potential that generates a set of Dirac points that are different from those of the graphene lattice itself.

Twisted monolayer-bilayer graphene is an attractive platform to study the interplay between topology, magnetism and correlations in the flat bands. Here, using electrical transport measurements, the authors uncover a rich correlated phase diagram and identify a new insulating state that can be explained by intervalley coherence with broken time reversal symmetry.

The authors demonstrate the tunability of moiré potential and emergent moiré exciton Rydberg states in a monolayer transition metal dichalcogenide governed by an adjacent twisted bilayer graphene near the magic angle with gate-tunable local charge density.

Transport measurements of dual-gated devices constructed by slightly rotating a monolayer graphene sheet atop a thin bulk graphite crystal are performed, showing that moiré potential transforms the electronic properties of an entire graphitic thin film.

A new spectroscopic technique takes advantage of overlapping electronic bands to probe the strongly correlated states of magic-angle twisted trilayer graphene.

Stacking a monolayer and bilayer of graphene, with a small twist angle between them, creates a tunable platform where the physics of both twisted bilayer graphene and twisted double bilayer graphene can be realized.

The anomalous Hall effect can signify that a material has a spontaneous magnetic order. Now, twisted bilayer graphene shows this effect at half filling, suggesting that the ground state is valley-polarized.

Scanning tunnelling spectroscopy is used to map the atomic-scale electronic structure of magic-angle twisted bilayer graphene, finding multiple signatures of electron correlations and thus providing insight into the sought-after mechanism behind superconductivity in graphene.

Transport measurements show that spontaneous symmetry breaking plays a crucial role in the correlated insulating and metallic states in twisted double bilayer graphene.

For appropriately aligned layers of different two-dimensional materials, the separation between layers—and hence the interlayer coupling—is very sensitive to pressure, leading to pressure-induced changes in the electronic properties of the heterostructures.

This is an overview of the new physics that emerges in van der Waals heterostructures consisting of graphene and hexagonal boron nitride, including the integer and fractional quantum Hall effects, novel plasmonic states and the effects of emergent moiré superlattices.