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Topological states characterized by Chern numbers are usually considered to be the global properties of a material. Now a spatial patchwork of different Chern insulator states is imaged in twisted bilayer graphene.
Experiments at the Joint European Torus tokamak show improved thermal ion confinement in the presence of highly energetic ions and Alfvénic instabilities in the plasma.
Quantum confinement effects offer a more comprehensive understanding of the fundamental processes that drive extreme optical nonlinearities in nano-engineered solids, opening a route to unlocking the potential of high-order harmonic generation.
Both inter- and intraband transitions contribute to high-harmonic generation in solids, but their exact roles are not fully understood. Experiments with quantum dots show that enhanced intraband transitions lead to increased carrier injection and thus enhanced harmonic generation.
Magnetic skyrmions—a type of localized spin texture—have been theoretically predicted to annihilate with counterparts known as antiskyrmions. By means of electron microscopy, such annihilation has now been observed in a cubic chiral magnet.
Combinatorial optimization is one of the areas for which quantum computing promises to overcome classical devices. An experiment with arrays of Rydberg atoms now shows how to solve combinatorial graph problems with auxiliary atomic wires.
The hydrodynamic description of many-body quantum systems is a key part of our understanding of out-of-equilibrium physics. Exotic, highly constrained quantum particles called fractons require a treatment that goes beyond hydrodynamics.
The hunt for new particles helps to complete our understanding of hadronic matter. The LHCb Collaboration now reports the surprising observation of a doubly charmed tetraquark.
The LHCb Collaboration reports the observation of an exotic, narrow, tetraquark state that contains two charm quarks, an up antiquark and a down antiquark.
Fractons are particles that can only move in tandem, which substantially affects their thermalization. Below four spatial dimensions, an unconventional dynamical universality class can emerge as thermal fluctuations destroy hydrodynamic behaviour.
The shift of the definition of the kilogram in 2019 away from an artefact to one relying on the Planck constant inspires technological innovation, as Naoki Kuramoto elucidates.
Advances in precision lithography and measurement have made it possible to observe and control the magnetic phase transition in kagome artificial spin ice, which could lead to new technological devices.
Uncovering structures in temporal networks requires different tools than in their static counterparts. A metric now quantifies whether the nodes with a large number of connections also tend to stay simultaneously connected for longer times.
Against the backdrop of various philosophical accounts, this Comment argues for the need of a human rights approach to scientific progress, which requires us to rethink how we view scientific knowledge.
