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Nature Physics - AOP - nature.com science feeds



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.



 



Quantum hydrodynamics: Acoustic Hawking radiation

2016-08-15

A milestone for quantum hydrodynamics may have been reached, with experiments on a black hole-like event horizon for sound waves providing strong evidence for a sonic analogue of Hawking radiation.



Cell biophysics: How to eat on the go

2016-08-08

Dendritic cells use components of their cytoskeleton to both move and ingest pieces of infected cells. This competition for protein resources can give rise to a complex set of states that may be understood with an advection–diffusion model.



Statistical physics: Localization goes long

2016-08-01

Signatures of many-body localization have been observed in a one-dimensional chain of trapped ions, heralding new studies of the interplay between localization and long-range interactions.



Thermodynamics of ice: Not obeying the rules

2016-07-25

The physical properties of ice are governed by its tetrahedral network of hydrogen bonds and the ice rules that determine the distribution of the protons. Deviations from the tetrahedral structure and violations of these rules can lead to surprising phenomena, such as the ferroelectric state now reported for thin films of epitaxial ice.



Superfluid helium: Caught speeding

2016-07-18

A wire moving at constant speed through superfluid helium can considerably exceed the Landau critical velocity.



Two-dimensional materials: Graphene traps

2016-06-27

Although Dirac fermions in graphene can tunnel through potential barriers without reflection, two experiments show how they can temporarily be trapped inside nanoscale graphene quantum dots.



Two-dimensional materials: Heavy going

2016-06-13

Chiral symmetry breaking is imaged in graphene which, through a mechanism analogous to mass generation in quantum electrodynamics, could provide a means for making it semiconducting.



Spin–orbit coupling: Ready for a close-up

2016-06-06

Rashba spin–orbit coupling has already provided fertile physics and applications in spintronics but real-space imaging shows how the strength of this interaction varies on the nanoscale.



Quantum measurement: Coping with pressure

2016-04-25

Radiation pressure noise from squeezed light constrains the precision of sensing devices such as improved gravitational wave interferometers.



Magnetic adatoms: When Ising meets Majorana

2016-04-18

The topological degeneracy associated with Majorana edge states has been measured in a spin-1/2 chain of cobalt atoms, thereby opening new avenues in low-dimensional quantum magnetism.



High-energy neutrino astrophysics

2016-07-04

Neutrinos from deep space can be used as astronomical messengers providing clues about the origin of cosmic rays or dark matter. The IceCube experiment is leading the way in neutrino astronomy.



One-dimensional spinon spin currents

2016-09-26

Spin currents can be carried by electrons and by magnons. Experiments now show that, in one-dimensional spin chains, spin currents can also be carried by particle-like excitations known as spinons.



Universality of pseudogap and emergent order in lightly doped Mott insulators

2016-09-19

Surprising observations in the evolution of electronic states in electron-doped iridates provide fresh insight into the melting of the Mott state and might lead to a fuller understanding of corresponding processes in copper-oxide superconductors.



Optical manipulation of valley pseudospin

2016-09-19

Valleys in momentum space provide a degree of freedom that could be exploited for applications. A demonstration of valley pseudospin control now completes the generation–manipulation–detection paradigm, paving the way for valleytronic devices.



Topological defects in confined populations of spindle-shaped cells

2016-09-12

Spindle-shaped cells readily form nematic structures marked by topological defects. When confined, the defect distribution is independent of the domain size, activity and type of cell, lending a stability not found in non-cellular active nematics.



Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2

2016-09-05

Observations of topological surface states provide strong evidence that MoTe2 is a type-II Weyl semimetal, hosting Weyl fermions that have no counterpart in high-energy physics.



Stokes solitons in optical microcavities

2016-09-05

Solitonic modes that are redshifted due to a Raman-related effect are reported in optical microcavities, and termed Stokes solitons.



Acoustic topological insulator and robust one-way sound transport

2016-08-29

The acoustic analogue of a topological insulator is shown: a metamaterial exhibiting one-way sound transport along its edge. The system—a graphene-like array of stainless-steel rods—is a promising new platform for exploring topological phenomena.



A micrometre-sized heat engine operating between bacterial reservoirs

2016-08-29

A colloidal particle connected to suspensions of motile bacteria forms a model system for studying microscale engines in contact with active baths. The engine outperforms its passive counterparts due to the presence of non-Gaussian fluctuations.



Gaps induced by inversion symmetry breaking and second-generation Dirac cones in graphene/hexagonal boron nitride

2016-08-22

Images of the second-generation Dirac cones that form when graphene is placed on hexagonal boron nitride show the potential of using superlattices to engineer the electronic band structure of van der Waals heterostructures.



Collective non-perturbative coupling of 2D electrons with high-quality-factor terahertz cavity photons

2016-08-22

Condensed-matter physics meets quantum optics in a study of light–matter interaction in the strong-coupling regime using a two-dimensional electron gas in a high-quality-factor terahertz cavity.



Ramsey-type phase control of free-electron beams

2016-08-15

Using a technique inspired by Ramsey spectroscopy it is now possible to coherently control free electrons in an electron microscope.



Breakdown of elasticity in amorphous solids

2016-08-08

The response of amorphous solids to external stress is not very well understood. A study now shows that certain glasses, upon decreasing temperature, undergo a phase transition characterized by diverging nonlinear elastic moduli.



Visualizing the evolution from the Mott insulator to a charge-ordered insulator in lightly doped cuprates

2016-08-08

A scanning tunnelling spectroscopy study focuses on the lightly doped region of the phase diagram of a cuprate superconductor to reveal the microscopic evolution of a high-temperature superconductor from a charge-ordered insulator.



Dirac fermions in an antiferromagnetic semimetal

2016-08-08

The prediction of an antiferromagnetic semimetal that breaks both time-reversal and inversion symmetry but respects their combination could provide a platform for studying the interplay between Dirac fermions and magnetism.



Quantum electrodynamics near a photonic bandgap

2016-08-01

Using a superconducting transmon qubit coupled to a microwave photonic crystal one can study intriguing strong-coupling effects such as the emergence of localized cavity modes within the photonic bandgap.



The effect of a prudent adaptive behaviour on disease transmission

2016-08-01

The common policy of replacing infected individuals with healthy substitutes can have the effect of accelerating disease transmission. A dynamic network model suggests that standard modelling approaches underplay the effect of network structure.



Many-body interferometry of a Rydberg-dressed spin lattice

2016-08-01

The control of long-range interactions is an essential ingredient for the study of exotic phases of matter using atoms in optical lattices. Such control is demonstrated using Rydberg dressing: the coupling of ground state atoms to Rydberg states.



Fermi-level-dependent charge-to-spin current conversion by Dirac surface states of topological insulators

2016-07-25

The spin–momentum locking of Dirac surface states offers intriguing possibilities for converting between charge and spin currents. Experiments show that fine tuning of the Fermi level is critical for maximizing the efficiency of such conversions.



Contribution of quasar-driven outflows to the extragalactic gamma-ray background

2016-07-25

The interaction between the outflow of gas from a quasar and the interstellar medium can boost protons to relativistic energies. Collisions between such protons can explain a significant fraction of the unexplained extragalactic gamma-ray background.



Breaking the superfluid speed limit in a fermionic condensate

2016-07-18

An experiment reports the unexpected behaviour of an object in uniform motion in superfluid helium-3 above the Landau critical velocity—the limit above which it can generate excitations at no energy cost.



Large anomalous Hall effect in a half-Heusler antiferromagnet

2016-07-18

The anomalous Hall effect is usually associated with ferromagnets but a large anomalous Hall response can be found in topologically non-trivial half-Heusler antiferromagnets thanks to Berry phase effects associated with symmetry breaking.



Ergodic dynamics and thermalization in an isolated quantum system

2016-07-11

The realization of a quantum kicked top provides evidence for ergodic dynamics and thermalization in a small quantum system consisting of three superconducting qubits.



Parametric amplification of a superconducting plasma wave

2016-07-11

Josephson plasma waves — electromagnetic waves propagating between layered superconductors — lie at the basis of a broad variety of phenomena. Now, parametric amplification of such waves has been shown by tuning the phase between pump and seed waves.



Elastic instability-mediated actuation by a supra-molecular polymer

2016-07-04

The elastic energy built up during peptide self-assembly is exploited in the realization of a microactuator. The energy stored is released on millisecond timescales via a buckling instability controlled with droplet microfluidics.



Fermionic response from fractionalization in an insulating two-dimensional magnet

2016-07-04

An intriguing state of matter known as a quantum spin liquid has been predicted to host Majorana fermions. A detailed theoretical and numerical analysis re-interprets existing Raman data for α-RuCl3 and uncovers direct evidence of a fermionic response.



Imaging electrostatically confined Dirac fermions in graphene quantum dots

2016-06-27

Relativistic Dirac fermions can be locally confirmed in nanoscale graphene quantum dots using electrostatic gating, and directly imaged using scanning tunnelling microscopy before escaping via Klein tunnelling.



Valley-symmetry-preserved transport in ballistic graphene with gate-defined carrier guiding

2016-06-20

Two distinct valleys in the electronic band structure of graphene provide an additional degree of freedom that could be exploited for devices. Conservation of this valley symmetry can now be seen in the quantized conductance of graphene nanoribbons.



Many-body localization in a quantum simulator with programmable random disorder

2016-06-06

Interacting quantum systems are expected to thermalize, but in some situations in the presence of disorder they can exist in localized states instead. This many-body localization is studied experimentally in a small system with programmable disorder.



Probing variations of the Rashba spin–orbit coupling at the nanometre scale

2016-05-16

Scanning tunnelling spectroscopy provides access to the spatial variations in the strength of Rashba spin–orbit coupling in a two-dimensional electron system, with local fluctuations shown to cause spin dephasing.



Scaling between magnetic field and temperature in the high-temperature superconductor BaFe2(As1−xPx)2

2016-05-16

The linear change in resistance with temperature in high-temperature superconductors is an enduring mystery. And now, the resistance in a magnetic field shows similar scaling, suggesting that physicists have another probe of the linear behaviour.



Dynamical observations of self-stabilizing stationary light

2016-09-26

Light propagating through a cloud of cold atoms can be slowed down by exciting a certain type of spin wave in the atomic ensemble. This stationary light could find applications in quantum technologies.



Universal dynamics and deterministic switching of dissipative Kerr solitons in optical microresonators

2016-09-26

A study of the dynamics of so-called Kerr solitons in optical microresonators reports the discovery of a simple mechanism that permits the step-wise reduction of soliton states, one by one.



Controlled finite momentum pairing and spatially varying order parameter in proximitized HgTe quantum wells

2016-09-19

The interplay between spin physics and superconductivity is examined in HgTe quantum wells, revealing a tunable momentum of the Cooper pairs that drives changes in their superconducting behaviour.



Direct observation of the skyrmion Hall effect

2016-09-19

Experiments show that when driven by electric currents, magnetic skyrmions experience transverse motion due to their topological charge—similar to the conventional Hall effect experienced by charged particles in a perpendicular magnetic field.



Nanotextured phase coexistence in the correlated insulator V2O3

2016-09-12

A near-field optical microscopy study provides nanoscale insight into an insulator-to-metal transition and the interplay with a neighbouring structural phase transition in a prototypical correlated electron material.



Magnetotail energy dissipation during an auroral substorm

2016-09-12

Substorms in the Earth’s magnetosphere lead to bright aurorae, releasing energy into the surrounding ionosphere. Ground- and space-based observations now reveal how that energy is dissipated and controlled by strong electric currents.



The age structure of the Milky Way’s halo

2016-09-05

A high-resolution age map of the Milky Way picks out structures that validate the most widely accepted cosmological theory, lambda cold dark matter. The chronographic data are also used to probe the chemodynamical formation history of our Galaxy.



Cross-scale energy transport in space plasmas

2016-09-05

Processes in (space) plasmas occur on different levels—fluid, ion and electron. Now, from satellite data and simulations, an energy-transfer mechanism between the fluid and ion scales is reported: fluid velocity shear is converted into ion heating.



Local equilibrium in bird flocks

2016-08-15

Animals moving in groups are expected to differ from their many-body counterparts in equilibrium. A method based on maximum entropy shows that the interactions in starling flocks rearrange slowly enough to permit an equilibrium description locally.



Anti-parity–time symmetry with flying atoms

2016-08-15

Parity–time symmetry in optics is studied in a warm atomic vapour, where its counterpart, anti-parity–time symmetry, as well as refractionless propagation, can also be observed.



Observation of quantum Hawking radiation and its entanglement in an analogue black hole

2016-08-15

Hawking radiation is observed emanating from an analogue black hole, with measurements of the entanglement between the pairs of particles inside and outside the hole offering tantalizing insights into the field of black hole thermodynamics.



Deterministic patterns in cell motility

2016-08-08

Cell motility is typically described as a random walk due to the presence of noise. But a dynamical model suggests that dendritic cells move deterministically, alternating between fast and slow motility, and exhibiting periodic polarity reversals.



Supercurrent in a room-temperature Bose–Einstein magnon condensate

2016-08-01

Studies of supercurrent phenomena, such as superconductivity and superfluidity, are usually restricted to cryogenic temperatures, but evidence suggests that a magnon supercurrent can be excited in a Bose–Einstein magnon condensate at room temperature.



Physical realization of a quantum spin liquid based on a complex frustration mechanism

2016-07-25

A detailed and systematic study of Ca10Cr7O28 reveals all the hallmarks of spin-liquid behaviour, in spite of the compound’s unusually complex structure.



Emergent high-Tc ferroelectric ordering of strongly correlated and frustrated protons in a heteroepitaxial ice film

2016-07-25

Ice is a frustrated system: many ground states are possible due to the structure of a water molecule and the geometry of the ice lattice. Now, this frustration is shown to lead to high-Tc ferroelectric proton ordering in a heteroepitaxial ice film.



Holographic maps of quasiparticle interference

2016-07-18

A method for analysing STM data enables the recovery of information about quasiparticle scattering in the form of holographic maps. The approach is verified for superconducting cuprates, but may find applications in heavy-fermion materials research.



Time reversal and holography with spacetime transformations

2016-07-11

Using a water bath subject to a sudden vertical jolt — representing a change in the effective gravity — researchers demonstrate the concept of a ‘time mirror’, where time-reversed waves return to their point source following a downward jolt.



Hidden geometric correlations in real multiplex networks

2016-07-04

Multiplex networks are shown to harbour significant correlations between layers. A framework describing the correlations enables multilayer community and link detection, and reveals that they improve navigation — but only when they’re strong.



Klein tunnelling and electron trapping in nanometre-scale graphene quantum dots

2016-06-27

Relativistic Dirac fermions can be locally confirmed in nanoscale graphene quantum dots using electrostatic gating, and directly imaged using scanning tunnelling microscopy before escaping via Klein tunnelling.



Dynamics of prey prehension by chameleons through viscous adhesion

2016-06-20

Chameleons rely on strong adhesion to manoeuvre prey with their tongues at high speeds across distances up to twice their body length. A large contact area and high mucus viscosity are shown to engender an efficient capture mechanism.



Explaining the dynamics of the ultra-relativistic third Van Allen radiation belt

2016-06-20

The appearance of a third radiation belt in the Earth’s Van Allen belts is difficult to explain using existing models for two belts. However, a model based on ultra-low-frequency waves agrees quantitatively with measurements of the third belt.



Topological semimetals with helicoid surface states

2016-06-06

A detailed theoretical and numerical study demonstrates a connection between the electronic structure of topological semimetals and Riemann surfaces.



Imaging chiral symmetry breaking from Kekulé bond order in graphene

2016-05-23

Scanning tunnelling microscopy shows how the interaction between electrons in graphene and atomic vacancies in a copper substrate produces Kekulé ordering — an electronic phase that breaks chiral symmetry.



Liquid explosions induced by X-ray laser pulses

2016-05-23

X-ray-induced explosions in water drops, examined using time-resolved imaging, show interacting high-speed liquid and vapour flows. This type of X-ray absorption dynamics is predictable and may be used for inducing particular dynamical liquid states.



The physics of spreading processes in multilayer networks

2016-08-22

Reshaping network theory to describe the multilayered structures of the real world has formed a focus in complex networks research in recent years. Progress in our understanding of dynamical processes is but one of the fruits of this labour.