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A scanning tunnelling microscopy study of monolayer FeSe on strontium titanate reveals that this intriguing system has a plain s-wave pairing symmetry.
Interacting optical wavepackets in the presence of a thermal optical nonlinearity are described by the same mathematics as the gravitational self-interaction of quantum wavepackets, providing a way of emulating gravitational phenomena in the lab.
The formation of vortex arrays in rotating Fermi gases is not limited to ultracold gases but may be relevant in nuclei and neutron stars, so it is important to be able to calculate their properties in a realistic fashion.
Radiation–matter interactions can become highly nonlinear when using high-intensity X-ray free-electron lasers. Under such conditions, it is shown that nonlinear Compton scattering has an anomalous redshift, whose origin remains unclear.
Due to its structural simplicity, iron selenide is an attractive system for understanding the electronic mechanism for superconductivity in iron-based materials. A theoretical study now examines the influence of magnetic frustration in this system.
Systems exhibiting slow relaxation to equilibrium are often characterized in terms of an effective temperature arising from a modified fluctuation–dissipation theorem. Single-molecule experiments provide direct evidence for the validity of this idea.
The Bose–Einstein condensation of ultracold atoms in a strong synthetic magnetic field in a cubic lattice realizes the Harper–Hofstadter model used in the study of topological states of matter.
The complex interactions inherent in real-world networks grant us precise system control via manipulation of a subset of nodes. It turns out that the extent to which we can exercise this control depends sensitively on the number of nodes perturbed.
The accurate determination of quark mixing parameters is essential for the understanding of the Standard Model. The LHCb collaboration now reports the coupling strength of the b quark to the u quark through the measurement of a baryonic decay mode.
Cells rely on coherent oscillatory processes, despite being subject to large fluctuations from their environment. Simple motifs found in all oscillatory systems are studied to determine the thermodynamic cost of maintaining this coherence.
A reformulation of quantum theory aims at reconciling transition probabilities with time reversal in connection to Wigner’s notion of symmetry, expanding the known classes of symmetry transformations.
A high-resolution X-ray diffraction study of chromium and niobium diselenide traces the evolution of the ordering wavevector in charge and spin density waves, respectively, as a function of temperature and applied pressure.
New three-dimensional simulations of magnetic reconnection suggest the existence of secondary reconnection sites that could be observed by the new NASA Magnetospheric MultiScale Mission.
The evidence for a time-reversal symmetry-breaking phase in high-temperature cuprate superconductors has been contradictory. But these observations are consistent with a theory predicting fractional vortices that form ‘necklaces’.
Reducing the signal-to-noise ratio is a never-ending challenge for many types of experiments. Now, improved ratios are reported for nuclear magnetic resonance set-ups combining an external high-Q resonator and a low-Q input coil.
Terahertz radiation is used to directly probe magnetotransport in metallic multilayers on the timescale of electron momentum scattering—the fundamental conditions of Nevill Mott’s model of spin-dependent conduction in metals.
Light propagating through a scattering medium exhibits correlations in the transmission matrix. A theoretical and experimental study uncovers intensity correlations that survive multiple scattering, which could be exploited for imaging.
The pressure that a fluid of self-propelled particles exerts on its container is shown to depend on microscopic interactions between fluid and container, suggesting that there is no equation of state for mechanical pressure in generic active systems.
Our understanding of how catastrophe propagates in multi-layered networks relies on theories that apply only to infinite systems. Reducing the interconnected networks to a set of decoupled graphs provides a route to probing finite sizes.