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Ferromagnetic semiconductors that have the critical properties of semiconductors and ferromagnetism at room temperature have so far proven elusive. Here, by doping black phosphorus with Cobalt, Fu, Qu, Hou, Chang and coauthors induce ferromagnetism that persists up to room temperature, all while maintaining black phosphorus’ semiconducting properties.

Rhenium disulphide, ReS₂, is a member of the two-dimensional dichalcogenide family. Here, the authors find a suppression of conductivity at high charge density levels in devices with polymer electrolyte gates. The effects of doping and disorder are explored theoretically and experimentally.

Kekulé vortices in hexagonal lattices can host fractionalized charges at zero magnetic field, but have remained out of experimental reach. Here, the authors report a Kekulé vortex in the local density states of graphene around a chemisorbed hydrogen adatom.

Graphene nanoelectromechanical systems enable the study of the interplay between electrical conductivity and mechanical properties. Here, the authors observe oscillations in the electromechanical response of bilayer graphene due to wrinkling, rather than the linear response seen in single layers.

Charge quadrupole order was predicted in several 5d¹ and 5d² double perovskite systems, but experimental verification has been challenging. Here the authors provide experimental and theoretical evidence of simultaneous charge quadrupole order and local structural distortions in Ba₂MgReO₆.

Magneto-transport measurements on thin metallic crystals of the transition metal dichalcogenide PtSe₂ show signatures of ferro- and antiferromagnetic order depending on the number of layers and first-principles calculations suggest Pt vacancies at the surface as a plausible cause.

Dynamic Jahn-Teller effect is rarely realized in condensed matter systems. Here, the authors demonstrate its occurrence in Ba₂MgReO₆, a 5d¹ double perovskite, using resonant inelastic x-ray scattering, thermodynamic measurements and quantum chemistry calculations.

This Review discusses the recent experimental and theoretical findings on polycrystalline graphene and related materials.

Graphene films are usually made from domains with different orientations. How does this affect transport? A theory of charge transmission through graphene grain boundaries now predicts two distinct transport behaviours depending on the grain-boundary structure. The results could provide important information for the design of efficient graphene-based electronic devices.

Edge effects matter in graphene, particularly in nanoribbons. A study using scanning tunnelling microscopy and spectroscopy reveals how chirality at the atomically well-defined edges of a graphene nanoribbon affects its electronic structure.

Deep level transient spectroscopy (DLTS) is an established characterization technique used to study electrically active defects in 3D semiconductors. Here, the authors show that DLTS can also be applied to monolayer semiconductors, enabling in-situ characterization of the energy states of different defects and their interactions.

The energy position of the van Hove singularity in a van der Waals flat-band system is detected by tunnelling (photo)currents within a field-effect structure.

Kagome lattice materials combine a frustrated lattice with electron–electron and spin–orbit interactions. One of them, Co₃Sn₂S₂, now reveals magnetic properties that respond in the opposite way to what is expected.

Two-dimensional transition metal dichalcogenides (TMDCs) exhibit attractive electronic and mechanical properties. In this Review, the charge density wave, superconductive and topological phases of TMCDs are discussed, along with their synthesis and applications in devices with enhanced mobility and with the use of strain engineering to improve their properties.

The nature of defects in transition metal dichalcogenide semiconductors is still under debate. Here, the authors determine the atomic structure and electronic properties of chalcogen-site point defects common to monolayer MoSe₂ and WS₂, and find that these are substitutional defects, where a chalcogen atom is substituted by an oxygen atom, rather than vacancies.

Transition metal dichalcogenides may host exotic topological phases in the two-dimensional limit, but detailed atomic properties have rarely been explored. Here, Ugeda et al. observe edge-states at the interface between a single layer quantum spin Hall insulator 1T′-WSe₂ and a semiconductor 1H-WSe₂.

Laser-based micro-focused angle-resolved photoemission spectroscopy reveals both fractionalized and marginal quasiparticles in C₃-symmetric electron pockets near the Brillouin zone centre of the ferromagnetic kagome metal Fe₃Sn₂.

The quasi-one-dimensional bismuth iodide β-Bi₄I₄ is theoretically predicted and experimentally confirmed to exhibit a (1;110) Z₂ strong topological insulator phase.

Beneficiary defects could be utilized to introduce magnetism into materials that are not intrinsically magnetic. Here, the authors demonstrate long range magnetic order in the air-stable, defective Platinum Diselenide in the ultimate limit of thickness by using proximitized graphene as a probe.

A versatile methodology to detect topological quasiparticles by transport measurements remains an open problem. Here, the authors propose and experimentally observe the temperature dependence of the quantum oscillation frequency as a signature of non-trivial band topology.

Mobile excitons in metals have been elusive, as screening usually suppresses their formation. Here, the authors demonstrate such mobile bound states in quasi-one-dimensional metallic TaSe₃, taking advantage of its low dimensionality and carrier density.

In all experimentally observed Weyl semimetals so far, the Weyl points always appear in pairs in the momentum space. Here, the authors report one unpaired Weyl point without surface Fermi arc emerging at the center of the Brillouin zone, which is surrounded by charged Weyl nodal walls in PtGa.

Weyl points in three-dimensional systems with certain symmetry carry non-Abelian topological charges, which can be transformed via non-trivial phase factors that arise upon braiding these points inside the reciprocal space.

Placing two Bernal-stacked graphene bilayers on top of each other with a small twist angle gives correlated states. As the band structure can be tuned by an electric field, this platform is a more varied setting to study correlated electrons.