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Twisted van der Waals structures represent a versatile platform to investigate topological and correlated electronic states. Here, the authors report the visualization of an electron crystal phase in twisted monolayer-bilayer graphene via scanning tunnelling microscopy, studying the coupling between strong electron correlation and nontrivial band topology.

Observing and tuning the Kondo effect in graphene is experimentally challenging. Here, the authors identify the spectroscopic signature of Kondo screening in graphene, along with a quantum phase transition between screened and unscreened phases of vacancy magnetic moments.

A transition from optical transport to quantum confinement, observed in a size-tunable circular graphene p–n junction could enable switching and guiding of Dirac electrons.

Sliding ferroelectricity with finite conductance can yield ferroelectric hysteresis with concomitant Coulomb screening in monolayer graphene containing van der Waals heterostructures of various compositions.

In moiré superlattices of rhombohedral trilayer graphene aligned on boron nitride, heating may counterintuitively promote spin–valley polarization, transforming metallic ground states into insulators at high temperatures, which deepens the understanding of isospin flavor polarization in correlated electronic systems.

Fast charging of electrochemical energy storage devices in under 10 minutes is desired but difficult to achieve in Li-ion batteries. Here, authors present an ampere-hour-scale potassium-ion hybrid capacitor, combining the merits of a battery and capacitor, and demonstrate a 6-minute charging time.

6R-TaS2 is a natural van der Waals heterostructure formed by 1H- and 1T-phase TaS₂ layers, which can individually exhibit Ising superconductivity, correlated states and charge density waves. Here, the authors show experimental evidence of emergent nematic Ising superconductivity with simultaneous hidden magnetism (extrinsic anomalous Hall effect and Kondo screening) in 6R-TaS₂ under 30 K.

A mechanical exfoliation method for producing freestanding metal oxide ultrathin flakes is reported. The flakes can be transferred and integrated with 2D materials, providing a platform to investigate the fundamental properties of ultrathin metal oxides.

When the continuous scale symmetry of a quantum system is broken, anomalies occur which may lead to quantum phase transitions. Here, the authors provide evidence for such a quantum phase transition in the attractive Coulomb potential of vacancies in graphene, and further envision its universality for diverse physical systems.

Understanding the nature of pair density waves provides valuable insights into the fundamental physics of correlated electron systems. Here, the authors observe coexisting pair density and charge density waves and characterize their interplay.

Single carbon vacancies in graphene can host a positive charge that is tunable. When this charge is large enough such vacancies resemble artificial atoms, with an induced sequence of quasi-bound states that trap nearby electrons.

Interfacial ferroelectricity may emerge in moiré superlattices. Here, the authors find that the polarized charge is much larger than the capacity of the moiré miniband and the associated anomalous screening exists outside the band.

The alignment of three 2D nanosheets leads to the formation of super-moiré atomic lattices, which can influence the electronic properties of van der Waals structures. Here, the authors report evidence of possible correlated insulating states in doubly-aligned hBN/graphene/hBN heterostructures, in a weak-interaction regime.

Interfacing graphene with an antiferromagnetic insulator CrOCl enables the observation of strong interfacial coupling in the quantum Hall regime.

Buckled monolayer graphene superlattices are found to provide an alternative to twisted bilayer graphene for the study of flat bands and correlated states in a carbon-based material.

When scanning tunnelling spectroscopy is used to map the electronic structure of magic-angle twisted bilayer graphene, a pseudogap phase is found, accompanied by a global charge-ordered stripe phase.

Twisted monolayer-bilayer graphene has attracted intense interest due to its rich symmetry-broken states which can be tuned by an external electric field. Here, the authors determine the ground states at half-filling of the conduction band under opposite electric field and report on a symmetry-broken Chern insulator state with its Chern number closely related to the half-filling ground states.