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Nature Physics offers a unique mix of news and reviews alongside top-quality research papers. Published monthly, in print and online, the journal reflects the entire spectrum of physics, pure and applied.
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Direct imaging of orbitals in quantum materials

Δευ, 25/03/2019 - 00:00

Direct imaging of orbitals in quantum materials

Direct imaging of orbitals in quantum materials, Published online: 25 March 2019; doi:10.1038/s41567-019-0471-2

Getting a picture of a d or f atomic orbital has been a challenge, but the X-ray scattering technique reported here enables direct transition from core s orbitals to the d orbitals so that their spatial shape can be mapped with no need for modelling.

Stern–Gerlach detection of neutral-atom qubits in a state-dependent optical lattice

Δευ, 25/03/2019 - 00:00

Stern–Gerlach detection of neutral-atom qubits in a state-dependent optical lattice

Stern–Gerlach detection of neutral-atom qubits in a state-dependent optical lattice, Published online: 25 March 2019; doi:10.1038/s41567-019-0478-8

A technique based on the coherent splitting of the atoms’ wavefunctions according to their internal states in an optical lattice allows the measurement of neutral-atom qubits in a three-dimensional array with extremely high fidelity, up to 99.94%.

Bacteria display optimal transport near surfaces

Δευ, 25/03/2019 - 00:00

Bacteria display optimal transport near surfaces

Bacteria display optimal transport near surfaces, Published online: 25 March 2019; doi:10.1038/s41567-019-0460-5

Bacteria swimming near surfaces can get trapped in circular trajectories that lead nowhere, hindering efficient surface exploration. A harmful strain of bacteria is now shown to circumvent the problem by exploiting transient surface adhesion events.

From networks to optimal higher-order models of complex systems

Δευ, 25/03/2019 - 00:00

From networks to optimal higher-order models of complex systems

From networks to optimal higher-order models of complex systems, Published online: 25 March 2019; doi:10.1038/s41567-019-0459-y

Rich data are revealing that complex dependencies between the nodes of a network may not be captured by models based on pairwise interactions. Higher-order network models go beyond these limitations, offering new perspectives for understanding complex systems.

Second-order topology and multidimensional topological transitions in sonic crystals

Δευ, 18/03/2019 - 00:00

Second-order topology and multidimensional topological transitions in sonic crystals

Second-order topology and multidimensional topological transitions in sonic crystals, Published online: 18 March 2019; doi:10.1038/s41567-019-0472-1

By tuning the geometry of a two-dimensional sonic crystal, its one-dimensional helical edge states become gapped and zero-dimensional topological corner states emerge. The band topology is thus manifested in a hierarchy of dimensions.

Symmetry-enforced chiral hinge states and surface quantum anomalous Hall effect in the magnetic axion insulator Bi<sub>2–x</sub>Sm<sub>x</sub>Se<sub>3</sub>

Δευ, 18/03/2019 - 00:00

Symmetry-enforced chiral hinge states and surface quantum anomalous Hall effect in the magnetic axion insulator Bi2–xSmxSe3

Symmetry-enforced chiral hinge states and surface quantum anomalous Hall effect in the magnetic axion insulator Bi<sub>2–x</sub>Sm<sub>x</sub>Se<sub>3</sub>, Published online: 18 March 2019; doi:10.1038/s41567-019-0457-0

The second-order topological states—chiral hinge states—are predicted in axion insulators, ferromagnetic insulating materials with quantized electromagnetic response. The authors predict such states to occur in Sm-doped Bi2Se3.

Actin dynamics drive cell-like membrane deformation

Δευ, 18/03/2019 - 00:00

Actin dynamics drive cell-like membrane deformation

Actin dynamics drive cell-like membrane deformation, Published online: 18 March 2019; doi:10.1038/s41567-019-0464-1

The same type of polymer network deforms cell membranes inward, to absorb external material, and outward, to facilitate signal transmission. Experiments and theory show that these deformations are regulated by membrane tension and network mesh size.

Publisher Correction: Stochastic nonlinear dynamics of confined cell migration in two-state systems

Δευ, 18/03/2019 - 00:00

Publisher Correction: Stochastic nonlinear dynamics of confined cell migration in two-state systems

Publisher Correction: Stochastic nonlinear dynamics of confined cell migration in two-state systems, Published online: 18 March 2019; doi:10.1038/s41567-019-0493-9

Publisher Correction: Stochastic nonlinear dynamics of confined cell migration in two-state systems

Beta decay gets the ab initio treatment

Τρί, 12/03/2019 - 00:00

Beta decay gets the ab initio treatment

Beta decay gets the ab initio treatment, Published online: 12 March 2019; doi:10.1038/s41567-019-0483-y

One of the fundamental radioactive decay modes of nuclei is β decay. Now, nuclear theorists have used first-principles simulations to explain nuclear β decay properties across a range of light- to medium-mass isotopes, up to 100Sn.

Degenerate Bose gases near a <i>d</i>-wave shape resonance

Δευ, 11/03/2019 - 00:00

Degenerate Bose gases near a d-wave shape resonance

Degenerate Bose gases near a <i>d</i>-wave shape resonance, Published online: 11 March 2019; doi:10.1038/s41567-019-0455-2

A scattering resonance associated with quasi-bound diatomic levels trapped behind the centrifugal barrier has been observed in a quantum-degenerate potassium gas. Various measurements reveal the d-wave character of the collisions.

Discrepancy between experimental and theoretical β-decay rates resolved from first principles

Δευ, 11/03/2019 - 00:00

Discrepancy between experimental and theoretical β-decay rates resolved from first principles

Discrepancy between experimental and theoretical β-decay rates resolved from first principles, Published online: 11 March 2019; doi:10.1038/s41567-019-0450-7

The difference between the β-decay rate predicted for free neutrons and that measured in real nuclei is explained by first-principles calculations to arise from strong correlations and the weak-force coupling between nucleons.

Broadband Lamb shift in an engineered quantum system

Δευ, 11/03/2019 - 00:00

Broadband Lamb shift in an engineered quantum system

Broadband Lamb shift in an engineered quantum system, Published online: 11 March 2019; doi:10.1038/s41567-019-0449-0

The measured change in the fundamental frequency of a superconducting resonator coupled to a tunnel junction reveals a broadband constant Lamb shift, which is typically inaccessible in atomic systems.

Enhanced bacterial swimming speeds in macromolecular polymer solutions

Δευ, 11/03/2019 - 00:00

Enhanced bacterial swimming speeds in macromolecular polymer solutions

Enhanced bacterial swimming speeds in macromolecular polymer solutions, Published online: 11 March 2019; doi:10.1038/s41567-019-0454-3

Bacteria and other helical microswimmers are known to swim faster in non-Newtonian fluids. Coarse-grained simulations suggest the increase may be due to a polymer depletion effect near the body and flagellum, inducing a slip velocity at the surface.

Chiral exchange drag and chirality oscillations in synthetic antiferromagnets

Δευ, 11/03/2019 - 00:00

Chiral exchange drag and chirality oscillations in synthetic antiferromagnets

Chiral exchange drag and chirality oscillations in synthetic antiferromagnets, Published online: 11 March 2019; doi:10.1038/s41567-019-0438-3

Drag effects between interacting particles in nearby layers can impact their motion. Here, this idea is extended to angular momentum in domain walls in a synthetic antiferromagnet and synchronization is observed.

Audible Landau levels

Τρί, 05/03/2019 - 00:00

Audible Landau levels

Audible Landau levels, Published online: 05 March 2019; doi:10.1038/s41567-019-0479-7

Artificial magnetic fields have been constructed in 2D and 3D acoustic structures to manipulate sound, in much the same way as Dirac and Weyl fermions respond to magnetic fields in their quantum levels.

Cluster formation by acoustic forces and active fluctuations in levitated granular matter

Δευ, 04/03/2019 - 00:00

Cluster formation by acoustic forces and active fluctuations in levitated granular matter

Cluster formation by acoustic forces and active fluctuations in levitated granular matter, Published online: 04 March 2019; doi:10.1038/s41567-019-0440-9

Acoustically levitated granular particles offer a platform on which to study self-assembly in a macroscopic system. Precise acoustic tuning reveals how cluster statistics and assembly pathways change as the system moves out of equilibrium.

Coherent X-ray spectroscopy reveals the persistence of island arrangements during layer-by-layer growth

Δευ, 04/03/2019 - 00:00

Coherent X-ray spectroscopy reveals the persistence of island arrangements during layer-by-layer growth

Coherent X-ray spectroscopy reveals the persistence of island arrangements during layer-by-layer growth, Published online: 04 March 2019; doi:10.1038/s41567-019-0448-1

In situ measurements based on coherent X-ray spectroscopy are performed during the epitaxial growth of gallium nitride films, revealing a memory effect in the arrangement of islands formed on successive crystal layers.

Acoustic Landau quantization and quantum-Hall-like edge states

Δευ, 04/03/2019 - 00:00

Acoustic Landau quantization and quantum-Hall-like edge states

Acoustic Landau quantization and quantum-Hall-like edge states, Published online: 04 March 2019; doi:10.1038/s41567-019-0446-3

A graphene-like two-dimensional sonic crystal, under uniaxial deformation, experiences a giant uniform pseudomagnetic field. This leads to the quantization of the cyclotron orbits—a kind of acoustic Landau level—that is observed here.

Aharonov–Bohm interference of fractional quantum Hall edge modes

Δευ, 04/03/2019 - 00:00

Aharonov–Bohm interference of fractional quantum Hall edge modes

Aharonov–Bohm interference of fractional quantum Hall edge modes, Published online: 04 March 2019; doi:10.1038/s41567-019-0441-8

An interferometer device demonstrates the interference of fractional quantum Hall effect edge states. This is a big step towards braiding non-Abelian anyons.

Quantum hardware simulating four-dimensional inelastic neutron scattering

Δευ, 04/03/2019 - 00:00

Quantum hardware simulating four-dimensional inelastic neutron scattering

Quantum hardware simulating four-dimensional inelastic neutron scattering, Published online: 04 March 2019; doi:10.1038/s41567-019-0437-4

Inelastic neutron scattering is used to probe the spin dynamics of molecular nanomagnets, but extensive supporting computations make the technique challenging. Proof-of-principle experiments now show that quantum computers may solve these computations efficiently.

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