Research articles

Light–matter interactions in monolayer MoSe₂ can be dramatically modified by the interactions between the excitonic states, leading to a rich set of light-driven coherent phenomena.

Knotted lines representing torus knot and figure-eight knot are produced in the polarization profile of optical beams, leading to a topological characterization of the structure of the polarization field.

A magnetic field and temperature gradient produce a large electric potential in a ferromagnet, indicating the possible presence of Weyl points. The specific structure of Weyl points gives the electrons quantum-critical properties.

Inspired to methods developed for the study of complex systems, a framework for predicting gross domestic product growth outperforms the accuracy of the five-year forecast of the International Monetary Fund.

The study of the band structure and crystal symmetry of the semimetal bismuth indicates that this material is a higher-order topological insulator hosting robust one-dimensional metallic states on the hinges of the crystal.

Electrical transport measurements reveal that Co₃Sn₂S₂ is probably a magnetic Weyl semimetal, and hosts the highest simultaneous anomalous Hall conductivity and anomalous Hall angle. This is driven by the strong Berry curvature near the Weyl points.

The authors study intermolecular Coulomb decay that occurs in a sample of THF and water in a reaction microscope employing triple-coincidence measurements of two ions and one electron. They find that ICD is a previously unconsidered effect between water and other organic molecules that are hydrogen-bonded, with ICD outpacing proton transfer.

Surprising phenomena are known to occur when magnetic systems are confined to low-dimensional geometries. A resonant X-ray scattering study of NdNiO₃ slabs reveals a crossover between different magnetic ground states as a function of thickness.

A spectroscopic approach based on the Rabi resonance method is used to probe the quantum states of ultracold neutrons—and thus their interaction with the gravitational potential of the Earth.

A generalized Mott-insulating state is found theoretically starting from a holographic model. The state has features in common with the conventional variety, and upon doping shares striking similarities with the stripe phases found in cuprates.

Active colloidal particles are shown to be capable of aggregating into stable spinning clusters that constitute self-powered microgears. The demonstration reveals a new design principle for micromachinery using dissipative building blocks.

The organization of small clusters of connected cells confined to an egg chamber during early development can be mapped onto a tree packing problem. Entropically preferred packing configurations are shown to arise more readily in experiment.

Calculating the amount of radiation that can ultimately be extracted from free electrons near an arbitrary material structure is a challenge. Now, an upper limit to the spontaneous photon emission of electrons is demonstrated, regardless of geometry.

A mechanical-mediated quantum-compatible microwave–optical converter achieves high efficiency through a feed-forward protocol that harnesses correlations in the output noise.

Certification of high-dimensional entanglement is required for improved quantum communication protocols, and is now shown to be achievable in an efficient manner by measuring quantum states twice in two different bases.

A neutron scattering study of the three-dimensional antiferromagnet Cu₃TeO₆ uncovers evidence for topological crossings in the magnon spectra of this system.

A violation of Lorentz symmetry would represent a fundamental departure from the physics of the standard model. Searching for anomalous neutrino oscillations, the IceCube collaboration reports no violation, and puts stringent bounds on its existence.

The state of a superconducting circuit qubit governs the photonic heat flow through an integrated assembly, constituting a quantum heat valve that provides a testbed for exploring quantum thermodynamics in a circuit quantum electrodynamics setting.

Transport measurements performed on MoGe superconducting nanowires reveal a quantitative agreement with quantum critical behaviour driven by a pair-breaking mechanism.

The authors theoretically investigate a novel form of a Doppler effect in homogeneous systems with positive refractive index that occurs under certain conditions. It is suggested that this Doppler effect can be experimentally separated from other Doppler effects by using polaritons such as those found in graphene.