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Superconductivity is reported in magic-angle twisted four-layer and five-layer graphene systems. While they find that all magic-angle graphene systems fit into a unified hierarchy of systems that share a set of flat bands in their electronic band structures, they also report that there is a key distinction between magic-angle twisted bilayer graphene and the other family members, related to the difference in the way the electrons move between the layers in a magnetic field.
Rechargeable batteries with sodium metal anodes are promising as energy-storage systems despite safety concerns related to reactivity and dendrite formation. Solvent-free perfluoropolyether-based electrolytes are now reported for safe and stable all-solid-state sodium metal batteries.
The partial oxidation of CH4 to CH3OH is challenging to perform in artificial systems due to ready over-oxidation to CO and CO2. Here by confining mono-iron hydroxyl sites in a metal–organic framework, photo-oxidation of CH4 to CH3OH is achieved with high selectivity and time yield.
Here the authors describe a method for remote magnetothermal stimulation of neurons that achieves subsecond behavioural responses in Drosophila fruit flies by combining magnetic nanoparticles with TRPA1-A, a rate-sensitive thermoreceptor. Tuning the properties of magnetic nanoparticles to respond to different magnetic field strengths and frequencies enables multichannel thermal magnetogenetic stimulation.
Hafnium dioxide is of technological interest as it is compatible with silicon; however, previous work indicates that a nanometre grain size is required to generate ferroelectricity. Here ferroelectric Y-doped HfO2 thin films with high crystallinity are grown with large crystal grain sizes, indicating that ferroelectricity is intrinsic.
A competitive-chemical-reaction-based growth mechanism by controlling the kinetic parameters can easily realize the growth of transition metal chalcogenides and transition metal phosphorous chalcogenides with different compositions and phases.
Understanding reversible anionic redox reactions is key to designing high-energy-density cathodes for lithium-ion batteries. Anionic redox activation in cation-disordered rock-salt Li1.17Ti0.58Ni0.25O2 is shown to involve intermediate Ni3+/4+ species that can evolve to Ni2+ during relaxation.
The authors use scanning tunnelling microscopy and spectroscopy to visualize the electronic structure of mirror twin boundaries, revealing a Tomonaga–Luttinger liquid.
The authors show that an out-of-plane antidamping spin–orbit torque can produce a sizeable change in the switching dynamics of a magnetic layer with perpendicular anisotropy.
Distinct electronic and optical properties emerge from quantum confinement in low-dimensional materials. Here, combining optical characterization and ab initio calculations, the authors report an unconventional excitonic state and bound phonon sideband in layered silicon diphosphide.
A design paradigm to create robust robotic metamaterials using versatile gear clusters is demonstrated. It enables intriguing programmability of elastic properties and shape while preserving stability for intelligent machines.
The realization of large-scale exciton–polariton platforms operating at room temperature and exhibiting long-lived, strongly interacting excitons has been elusive. Here, the authors demonstrate a room-temperature perovskite-based polaritonic platform with a polariton lattice size of up to 10 × 10.
Electrostatic capacitors can enable ultrafast energy storage and release, but advances in energy density and efficiency need to be made. Here, by doping equimolar Zr, Hf and Sn into Bi4Ti3O12 thin films, a high-entropy stabilized Bi2Ti2O7 pyrochlore phase forms with an energy density of 182 J cm−3 and 78% efficiency.
Here the authors fabricate a fibre-coupled electrode ‘fibertrode’ that integrates light emission sites and platinum microelectrodes on tapered optical fibre neural implants, for combined stimulation and recording of neural activity over small brain volumes in vivo with reduced photoelectric artefacts.
The growth of lithium dendrites across electrolyte layers limits the practical viability of solid-state Li-ion batteries. A direct correlation between void formation and lithium dendrite growth in solid-state electrolytes with metallic interlayers is now observed.
The cycling disordering–ordering transition of low-misfit superlattice nanoprecipitates in metallic materials continuously annihilates radiation defects via a short-range atom-reshuffling process, giving rise to high radiation tolerance.
The performance of organic optoelectronic and energy-harvesting devices is largely dictated by molecular orientation and resultant permanent dipole moment. Here, the authors demonstrate a strategy to actively control dipole direction in organic glassy films.
Three-dimensional printed protein-based robotic structures are actuated by exoskeleton-like coats of molecular motor assemblies upon the spatially targeted release of chemical fuel, resulting in micrometre-scale shape-morphing activity.