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Topological kinematics of origami metamaterials

Δευ, 28/05/2018 - 00:00

Topological kinematics of origami metamaterials

Topological kinematics of origami metamaterials, Published online: 28 May 2018; doi:10.1038/s41567-018-0150-8

Origami-inspired metamaterial design gives rise to structures with kinematic properties dictated by the topology of their configuration space. The approach allows for well-defined metamaterial properties even in the presence of unpredictable forces.

Equilibrium free energies from non-equilibrium trajectories with relaxation fluctuation spectroscopy

Δευ, 28/05/2018 - 00:00

Equilibrium free energies from non-equilibrium trajectories with relaxation fluctuation spectroscopy

Equilibrium free energies from non-equilibrium trajectories with relaxation fluctuation spectroscopy, Published online: 28 May 2018; doi:10.1038/s41567-018-0153-5

Non-equilibrium physics grants access to equilibrium free energies from the work performed on fluctuating systems—but only when the work itself is measurable. Relaxation fluctuation spectroscopy provides an alternative route to these energies.

Direct evidence of ferromagnetism in a quantum anomalous Hall system

Δευ, 28/05/2018 - 00:00

Direct evidence of ferromagnetism in a quantum anomalous Hall system

Direct evidence of ferromagnetism in a quantum anomalous Hall system, Published online: 28 May 2018; doi:10.1038/s41567-018-0149-1

Long-range ferromagnetic order in co-doped topological insulator thin films and their typical ferromagnetic domain behaviour is directly evidenced by low-temperature magnetic force microscopy.

Clicks for doughnuts

Δευ, 28/05/2018 - 00:00

Clicks for doughnuts

Clicks for doughnuts, Published online: 28 May 2018; doi:10.1038/s41567-018-0160-6

The ideas of topology are breaking ground in origami-based metamaterials. Experiments now show that certain shapes — doughnuts included — exhibit topological bistability, and can be made to click between different topologically stable states.

Quantum simulation and spectroscopy of entanglement Hamiltonians

Δευ, 21/05/2018 - 00:00

Quantum simulation and spectroscopy of entanglement Hamiltonians

Quantum simulation and spectroscopy of entanglement Hamiltonians, Published online: 21 May 2018; doi:10.1038/s41567-018-0151-7

The entanglement spectrum of a many-body quantum system encodes several of its properties. The construction of an artificial Hamiltonian that encodes the spectrum offers the possibility to probe it via quantum simulation or spectroscopy.

Higgs mode in a strongly interacting fermionic superfluid

Δευ, 21/05/2018 - 00:00

Higgs mode in a strongly interacting fermionic superfluid

Higgs mode in a strongly interacting fermionic superfluid, Published online: 21 May 2018; doi:10.1038/s41567-018-0128-6

An off-resonant radiofrequency modulation scheme applied to a strongly interacting superfluid Fermi gas reveals the presence of a Higgs mode — an oscillation of the amplitude of the superconducting order parameter.

A hot debut

Δευ, 21/05/2018 - 00:00

A hot debut

A hot debut, Published online: 21 May 2018; doi:10.1038/s41567-018-0158-0

The first campaign of the largest stellarator ever built, Wendelstein 7-X, has been successful, achieving high electron temperatures and minimal self-generated plasma current. This is very encouraging for future long-pulse, full-power operation.

Magnetic configuration effects on the Wendelstein 7-X stellarator

Δευ, 21/05/2018 - 00:00

Magnetic configuration effects on the Wendelstein 7-X stellarator

Magnetic configuration effects on the Wendelstein 7-X stellarator, Published online: 21 May 2018; doi:10.1038/s41567-018-0141-9

Results from the first experimental campaign of the Wendelstein 7-X stellarator demonstrate that its magnetic-field design grants good control of parasitic plasma currents, leading to long energy confinement times.

Author Correction: Geometric constraints during epithelial jamming

Παρ, 18/05/2018 - 00:00

Author Correction: Geometric constraints during epithelial jamming

Author Correction: Geometric constraints during epithelial jamming, Published online: 18 May 2018; doi:10.1038/s41567-018-0168-y

Author Correction: Geometric constraints during epithelial jamming

Publisher Correction: Pressure tuning of light-induced superconductivity in K<sub>3</sub>C<sub>60</sub>

Τρί, 15/05/2018 - 00:00

Publisher Correction: Pressure tuning of light-induced superconductivity in K3C60

Publisher Correction: Pressure tuning of light-induced superconductivity in K<sub>3</sub>C<sub>60</sub>, Published online: 15 May 2018; doi:10.1038/s41567-018-0167-z

Publisher Correction: Pressure tuning of light-induced superconductivity in K3C60

Controlling Cherenkov angles with resonance transition radiation

Δευ, 14/05/2018 - 00:00

Controlling Cherenkov angles with resonance transition radiation

Controlling Cherenkov angles with resonance transition radiation, Published online: 14 May 2018; doi:10.1038/s41567-018-0138-4

The angle of Cherenkov radiation in one-dimensional photonic crystals can be controlled by making use of constructive interference. This feature allows new design of particle detectors with improved performance.

Escape the thermal fate

Δευ, 14/05/2018 - 00:00

Escape the thermal fate

Escape the thermal fate, Published online: 14 May 2018; doi:10.1038/s41567-018-0157-1

Many-body quantum systems fail to reach thermalization only under specific circumstances. An analysis now reveals a new, different kind of non-equilibrating dynamics based on the many-body analogue of quantum scars in single-particle quantum chaos.

Ferroelectric quantum Hall phase revealed by visualizing Landau level wavefunction interference

Δευ, 14/05/2018 - 00:00

Ferroelectric quantum Hall phase revealed by visualizing Landau level wavefunction interference

Ferroelectric quantum Hall phase revealed by visualizing Landau level wavefunction interference, Published online: 14 May 2018; doi:10.1038/s41567-018-0148-2

A phase of strongly interacting electrons that has a spontaneous dipole moment is seen for the first time using an approach that images the electron's wavefunction through interference at an impurity.

The physics of cooperative transport in groups of ants

Δευ, 14/05/2018 - 00:00

The physics of cooperative transport in groups of ants

The physics of cooperative transport in groups of ants, Published online: 14 May 2018; doi:10.1038/s41567-018-0107-y

Evidence that ants communicate mechanically to move objects several times their size has prompted a theory that places the group near a transition between uncoordinated and coordinated motion. These findings and their implications are reviewed here.

Weak ergodicity breaking from quantum many-body scars

Δευ, 14/05/2018 - 00:00

Weak ergodicity breaking from quantum many-body scars

Weak ergodicity breaking from quantum many-body scars, Published online: 14 May 2018; doi:10.1038/s41567-018-0137-5

Ergodicity can be strongly broken by integrable or many-body localized systems. A new form of weak ergodicity breaking is shown to arise from the presence of special eigenstates in the many-body spectrum akin to quantum scars in chaotic systems.

Topological quantum phase transition in the Ising-like antiferromagnetic spin chain BaCo<sub>2</sub>V<sub>2</sub>O<sub>8</sub>

Δευ, 07/05/2018 - 00:00

Topological quantum phase transition in the Ising-like antiferromagnetic spin chain BaCo2V2O8

Topological quantum phase transition in the Ising-like antiferromagnetic spin chain BaCo<sub>2</sub>V<sub>2</sub>O<sub>8</sub>, Published online: 07 May 2018; doi:10.1038/s41567-018-0126-8

A neutron scattering study of an Ising-like quasi-one-dimensional antiferromagnet, BaCo2V2O8, reveals a topological quantum phase transition when it is subjected to a transverse magnetic field.

Observation of two types of fractional excitation in the Kitaev honeycomb magnet

Δευ, 07/05/2018 - 00:00

Observation of two types of fractional excitation in the Kitaev honeycomb magnet

Observation of two types of fractional excitation in the Kitaev honeycomb magnet, Published online: 07 May 2018; doi:10.1038/s41567-018-0129-5

α-RuCl3, a promising candidate to realize the Kitaev model, has attracted great interest recently. Two types of fractional excitation—gauge fluxes and Majorana fermions—are observed, which contribute to the spin excitation gap in different ways.

Pressure tuning of light-induced superconductivity in K<sub>3</sub>C<sub>60</sub>

Δευ, 07/05/2018 - 00:00

Pressure tuning of light-induced superconductivity in K3C60

Pressure tuning of light-induced superconductivity in K<sub>3</sub>C<sub>60</sub>, Published online: 07 May 2018; doi:10.1038/s41567-018-0134-8

Superconductivity is studied in the molecular solid K3C60 when it is pressurized and illuminated with short laser pulses. Similarities with the non-illuminated case show that superconductivity exists at higher temperatures than previously thought.

Science worth fighting for

Τετ, 02/05/2018 - 00:00

Science worth fighting for

Science worth fighting for, Published online: 02 May 2018; doi:10.1038/s41567-018-0147-3

Against a backdrop of political upheaval and polarization, European science continues to be a bright spot, at least for now.

A good egg

Τετ, 02/05/2018 - 00:00

A good egg

A good egg, Published online: 02 May 2018; doi:10.1038/s41567-018-0142-8

A good egg

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