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Fluctuations arising from proximity to an antiferromagnetic state may be a mechanism for electron pairing in high-temperature superconductors. Now numerics show that only about half of the pairing interaction can be attributed to spin fluctuations considered in spin fluctuation theory.
Control of magnetization is important for applications in spintronics. Now, the piezomagnetic effect allows strain to control the anomalous Hall effect in a metal at room temperature by rotating its antiferromagnetic order.
In active solids, work is performed by elastically coupled units. By studying a minimal experimental model of an active solid, actuation mechanisms resulting in a collectively oscillating displacement field that drives work cycles are now identified.
The diode is a well-known component of semiconductor electronics, but equivalent behaviour in superconductors is rare. Now, two demonstrations of a superconducting diode effect show that this is possible, through different mechanisms.
In a plasma-based accelerator, the amplitude of the plasma wave is constrained by the wavebreaking limit. Experiments reveal features of the plasma waves at the point at which wavebreaking occurs.
A superconducting diode effect is observed at zero magnetic field in twisted trilayer graphene. This suggests that time-reversal symmetry is intrinsically broken and leads to pairing between electrons with non-zero centre-of-mass momentum.
Statistical correlations between particles play a central role in the study of complex quantum systems. A new study introduces microscopic detection of ultracold molecules and demonstrates the measurement of two-particle correlations.
Computer simulations have revealed the topological nature of the liquid–liquid phase transition in colloidal water. This finding might lead to an experimental observation of this topological transition with colloids as building blocks.
The study of statistical correlations is central to the description of complex quantum objects. Measurements of density correlation functions of ultracold molecules are now possible through the realization of a molecular quantum gas microscope.
The isotropy of a spherical droplet’s surface causes uniform distribution of adsorbed molecules. However, wrapping the droplet by a crystalline monolayer induces structural defects, enabling temperature-controllable positioning of adsorbates.
The anomalous Hall effect can signify that a material has a spontaneous magnetic order. Now, twisted bilayer graphene shows this effect at half filling, suggesting that the ground state is valley-polarized.
Supercooled water undergoes a liquid–liquid phase transition. The authors show that the two phases have distinct hydrogen-bond networks, differing in their degree of entanglement, and thus the transition can be described by the topological changes of the network.
