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NiPS₃ is a van der Waals material, which in the bulk is antiferromagnetic. Whether the antiferromagnetism persists down to the monolayer remains a topic of debate. Here, through magnetotransport measurements Cheon et al find that monolayer NiPS₃ exhibits two magnetic transitions, with a low temperature long-range ordered state.

Scanning tunnelling spectroscopy of MoS₂ provides insight into the nature of superconductivity in this 2D material.

Superconductivity can be induced in a two-dimensional material down to the single-layer limit by ionic liquid gating.

The electronic properties of interfaces between two different solids can differ strikingly from those of the constituent materials, as demonstrated by the high conductivity at the interface between insulating perovskite oxide layers. Metallic conductivity is now observed at the interface between organic insulators, which promises new scientific developments for organic electronics.

Heterointerfaces of organic semiconductors can show high electrical conductivity, but the details of their electronic structure remain largely unexplored. Schottky-gated heterostructures have now been used to probe the interface between single crystals of rubrene and PDIF-CN₂, showing that charge transport is due to electrons whose mobility exhibits band-like behaviour down to ~150 K.

Topological insulators are a unique class of materials characterized by exotic metallic states at their surface, while remaining insulated in the bulk. Sacépéet al. show how to manipulate normal and superconducting electronic transport at the surface of the topological insulator Bi₂Se₃, by tuning a gate-voltage to vary the electronic density.

Double-gate transistors of bilayer layered antiferromagnet CrPS₄ give full control of the spin polarization of the conduction band and of the magnetization of the accumulated electrons.

The overlap of different crystal lattices can give rise to a Moire structure with long range periodicity. While this feature has been heavily exploited in twisted van der Waals heterostructures, here, Yao et al find the telltale signatures of Moire magnetism in CrBr3 multilayers induced by differential strain, in the absence of twisting.

An electrically controllable spin–orbit interaction at the surface of transition-metal dichalcogenides highlights the wealth of unexpected physics that two-dimensional systems can offer.

When do structures comprising a few crystalline sheets become truly two dimensional? The number of layers certainly plays a role, but in trilayer graphene, the way they're stacked matters too — as shown in a series of Nature Physics papers from 2011.

Double ionic gated transistors enable excellent control of the band structure of atomically thin semiconductors. Perpendicular electric fields as large as 3 V nm⁻¹ can fully quench the gap of bi- and few-layer WSe₂.

Van der Waals materials often exhibit different metastable structures, with the constituent layers shifted by small, atomic scale distances. If the material is magnetic, the resulting different layer stackings can cause drastic changes in magnetic ordering. Here, Yao et al. observe all three locally stable magnetic orderings predicted to occur in CrBr₃ multilayers, two antiferromagnetic and one ferromagnetic.

Whether ballistic transport can occur in a system is usually governed by the number of impurities, but a ballistic transport regime is seen in charge-neutral graphene that is limited not by impurities or phonons, but electron–hole collisions.

Here, the authors report the realization of light-emitting field-effect transistors based on van der Waals heterostructures with conduction and valence band edges at the Γ-point of the Brillouin zone, showing electrically tunable and material-dependent electroluminescence spectra at room temperature.

Many standard techniques for investigating magnetic properties in the bulk are ill suited to atomically thin van der Waals materials. Here, Wang et al take a prototypical van der Waals ferromagnet, Chromium Bromide, and show how tunneling conductance can elucidate the material magnetic properties.

Graphene continues to surprise physicists with its remarkable electronic properties. Experiments now show that electrons in the material can team up to behave as if they are only fragments of themselves.

Semimetallic WTe₂ possesses very high magnetoresistance however conflicting pictures of the band structure responsible have emerged. Here, the authors find behaviour consistent with a model of two compensated electron and hold bands in exfoliated WTe₂films with thicknesses down to the atomic scale.

Routes towards inducing strong spin–orbit coupling in graphene have been hindered by detrimental effects on its electronic properties and material quality. Here, the authors demonstrate a possible solution by exploiting interfacial interactions between graphene and a tungsten disulfide substrate.

Electron–electron interactions have a strong influence on the properties of bilayer graphene, but less of an effect on trilayer material. Grushina et al. show that tetralayer graphene has an insulator state, bucking the trend for electron–electron interactions becoming weaker with more layers.

A comprehensive understanding of the magnetic phase diagram of atomically thin layered antiferromagnets is obtained by combining systematic tunnelling magnetoconductance measurements with theoretical modelling.

Layered van der Waals compounds offer opportunities to visit new physical phenomena in two dimensional materials. Here the authors report large tunneling magnetoresistance through exfoliated CrI3 crystals and attribute its evolution to the multiple transitions to different magnetic states.

Type-II van der Waals interfaces formed by different two-dimensional materials enable robust interlayer optical transitions, regardless of common issues such as lattice constant mismatch, layer misalignment or whether the constituent compounds are direct or indirect band semiconductors.

A commonly used blue dye is more than just a pretty colour. This material and its relatives are semiconductors, and their magnetic properties can be controlled by engineering their crystal structure.

Graphene has many intriguing electronic properties. One of note is the absence of backscattering of electrons confined to a single valley. Spin-orbit interactions can allow backscattering, and here, Sun et al. use this spin-orbit coupling dependence of backscattering to measure the strength of the spin-orbit interaction in a graphene/tungsten selenide heterostructure.

Graphene has a random edge structure. According to theory, this dirty and random edge affects the topological nature of bilayer graphene, which accounts for measurement discrepancies across different experimental probes.

At low temperatures, a superconducting current that flows through a graphene layer sandwiched between two superconducting electrodes can be carried by either electrons or by holes, depending on the gate voltage that determines the charge density in the graphene layer. Interestingly, this finds that a finite supercurrent can flow even when the charge density is zero.

A 2D magnet CrSBr has attracted interest for applications in spintronics due to its high critical temperature and interesting magneto-electrical properties. Here the authors report a detailed study of its magnetic and structural phases and uncover a hidden magnetic order inside the magnetically-ordered phase.

Over the last decade, ionic gate spectroscopy has developed into a powerful technique to measure gaps and band offsets of atomically thin semiconductors. Here, we provide a detailed overview of the technique, discussing results obtained on different 2D semiconducting materials.