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Active fluids exhibit regimes with a complex spatio-temporal structure reminiscent of inertial turbulence. Now, inertial and active turbulence are theoretically shown to be closely related indeed.
Switching of magnetic behaviour is one of the main ideas that drives spintronics. Now, magnetic switching via spin-orbit torque is shown in a moiré bilayer, introducing a platform for spintronic applications.
A levitated nanoparticle in an optical cavity has been cooled to its motional ground state in two degrees of freedom at the same time. Control of the cavity properties also enabled the observation of the transition from 1D to 2D ground-state cooling.
Ion acoustic bursts followed by electron acoustic bursts are observed during magnetic reconnection in a laboratory experiment. These bursts have been suggested to mediate energy dissipation.
It has been predicted that Josephson junction devices could produce quantized currents in analogy to the Shapiro steps of voltage used to define the voltage standard. These dual Shapiro steps have now been observed in a Josephson junction array.
Quantum turbulence typically entails reconnecting quantized vortices as seen in quantum fluids. Experiments with superfluid helium now show turbulent dynamics with negligible vortex reconnection, a regime dominated by interacting vortex waves at all length scales.
The calcium isotope 41Ca is a promising candidate to complement dating methods relying on radiocarbon. Small levels of 41Ca can be measured with atom-trap trace analysis, which brings the use of 41Ca a step closer to applications.
The scalability of quantum information processing applications is generally hindered by loss and inefficient preparation and detection. A minimal loss network based on phonons has now been realized with trapped ions.
A bursting bubble produces a jet drop previously estimated to be too large to contribute to aerosolization. Oil-coated bubbles produce fast and thin jets, which break up into much smaller drops with potential implications for airborne transmission.
Ultrafast photon–electron spectroscopy commonly requires a driving laser. Now, an inverse approach based on cathodoluminescence spectroscopy has allowed a compact solution to spectral interferometry inside an electron microscope, without a laser.
Photonic systems can exploit time as a degree of freedom analogous to space, eliminating the need for spatial patterning to achieve functionality. A Green’s function approach allows the design of disordered time scatterers with desired properties.
Bulk active fluids are unstable because activity destroys long-range ordering. Now, a model of 3D active liquids shows that stable states can form at fluid–fluid surfaces.
The realization of efficient light–matter interfaces is important for many quantum technologies. An experiment now shows how to coherently switch the collective optical properties of an array of quantum emitters by driving a single ancilla atom to a Rydberg state.
Premelting refers to the formation of a thin liquid film on a crystal’s surface before it properly melts. Now, a similar mechanism is shown to occur before solid–solid transitions in colloidal crystals: the formation of a polymorphic crystalline layer.
Tuning interspecies interactions in atomic Bose–Fermi mixtures is shown to drive the system through a quantum phase transition. This enables the generation of heteronuclear molecules in the quantum-degenerate regime.
The ATLAS Collaboration reports the observation of the electroweak production of two jets and a Z-boson pair. This process is related to vector-boson scattering and allows the nature of electroweak symmetry breaking to be probed.
Parametric amplifiers are a key component in the operation and readout of superconducting quantum circuits. An improved travelling-wave amplifier design enables broadband squeezing and high-performance operation.
Heavily doping silicon with phosphorus produces a dense population of metallic conduction electrons and localized magnetic moments. Low-temperature measurements show evidence of strongly correlated state.
The Lindemann criterion states that crystals melt when thermal vibrations overcome binding forces. It is now found that this picture does not hold for glasses, and that there is a universal relationship between glass temperature and thermal expansion.
