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Author Correction: Topological limits to the parallel processing capability of network architectures

Nature Physics - Παρ, 05/03/2021 - 00:00

Nature Physics, Published online: 05 March 2021; doi:10.1038/s41567-021-01212-4

Author Correction: Topological limits to the parallel processing capability of network architectures

Polarization out of the vortex

Nature Physics - Πέμ, 04/03/2021 - 00:00

Nature Physics, Published online: 04 March 2021; doi:10.1038/s41567-021-01167-6

The virtual photons that are exchanged when a free-electron vortex beam interacts with a nanoscopic target unlock an explicit connection between polarized optical spectroscopy and the inelastic scattering of scalar electron waves.

Optical polarization analogue in free electron beams

Nature Physics - Πέμ, 04/03/2021 - 00:00

Nature Physics, Published online: 04 March 2021; doi:10.1038/s41567-021-01163-w

The functionality of electron energy loss spectroscopy can be extended to include a polarization analogue constructed via the dipole transition vector between two electronic states, bringing it closer to its optical counterpart.

Split superconducting and time-reversal symmetry-breaking transitions in Sr<sub>2</sub>RuO<sub>4</sub> under stress

Nature Physics - Πέμ, 04/03/2021 - 00:00

Nature Physics, Published online: 04 March 2021; doi:10.1038/s41567-021-01182-7

When strain is applied to strontium ruthenate, superconductivity emerges at a different temperature to the breaking of time-reversal symmetry. This indicates that the superconductivity could have a chiral d-wave order parameter.

Publisher Correction: Nanoscale mechanics of antiferromagnetic domain walls

Nature Physics - Τρί, 02/03/2021 - 00:00

Nature Physics, Published online: 02 March 2021; doi:10.1038/s41567-021-01205-3

Publisher Correction: Nanoscale mechanics of antiferromagnetic domain walls

Symmetry-broken Chern insulators and Rashba-like Landau-level crossings in magic-angle bilayer graphene

Nature Physics - Δευ, 01/03/2021 - 00:00

Nature Physics, Published online: 01 March 2021; doi:10.1038/s41567-021-01186-3

In magic-angle twisted bilayer graphene, topological Chern bands that are driven by electron–electron interactions appear at all the integer fillings of the moiré unit cell. The Rashba-like higher-energy bands also show Landau-level crossings.

Multitudes of twists

Nature Physics - Πέμ, 25/02/2021 - 00:00

Nature Physics, Published online: 25 February 2021; doi:10.1038/s41567-021-01189-0

Multiplexing increases the capacity of optical communication, but it is limited by the number of modes and their orbital angular momentum. A robust vortex laser now solves this problem by emitting several beams, all carrying large topological charges.

Photonic quantum Hall effect and multiplexed light sources of large orbital angular momenta

Nature Physics - Πέμ, 25/02/2021 - 00:00

Nature Physics, Published online: 25 February 2021; doi:10.1038/s41567-021-01165-8

A topological photonic crystal design directly generates light that carries orbital angular momentum with high quantum numbers. The beam contains several different states at the same time, promising integrated and multiplexed light sources.

Non-equilibrium quantum dynamics and formation of the Bose polaron

Nature Physics - Πέμ, 25/02/2021 - 00:00

Nature Physics, Published online: 25 February 2021; doi:10.1038/s41567-021-01184-5

Quantum impurities immersed in a bosonic environment can evolve into polaronic quasiparticles, so-called polarons. Interferometric measurement reveals this transition, which involves three different regimes dominated by few-body and many-body dynamics.

Gain-induced topological response via tailored long-range interactions

Nature Physics - Πέμ, 25/02/2021 - 00:00

Nature Physics, Published online: 25 February 2021; doi:10.1038/s41567-021-01185-4

Non-Hermitian concepts together with optical gain allow the tailoring of short- and long-range exchange interactions in integrated topological photonics, and an exact Haldane model can be realized in this way.

Forward thinking on backward tracing

Nature Physics - Πέμ, 25/02/2021 - 00:00

Nature Physics, Published online: 25 February 2021; doi:10.1038/s41567-021-01188-1

SARS, MERS and now SARS-CoV-2 are unlikely to be the last emerging infections we face during our lifetimes. Tracing contacts both forward and backward through our heterogeneous populations will prove essential to future response strategies.

The effectiveness of backward contact tracing in networks

Nature Physics - Πέμ, 25/02/2021 - 00:00

Nature Physics, Published online: 25 February 2021; doi:10.1038/s41567-021-01187-2

Contact tracing is key to epidemic control, but network analysis now suggests that whom you infect may not be as pertinent a question as who infected you. Biases due to contact heterogeneity reveal the efficacy of backward over forward tracing.

Publisher Correction: Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of <i>N</i> = 32

Nature Physics - Τετ, 24/02/2021 - 00:00

Nature Physics, Published online: 24 February 2021; doi:10.1038/s41567-021-01192-5

Publisher Correction: Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of N = 32

Proton–electron mass ratio by high-resolution optical spectroscopy of ion ensembles in the resolved-carrier regime

Nature Physics - Πέμ, 18/02/2021 - 00:00

Nature Physics, Published online: 18 February 2021; doi:10.1038/s41567-020-01150-7

Laser spectroscopy can resolve vibrational transitions of molecular hydrogen ions without Doppler broadening when these are trapped within a cluster of laser-cooled atomic ions.

Tunable van Hove singularities and correlated states in twisted monolayer–bilayer graphene

Nature Physics - Πέμ, 18/02/2021 - 00:00

Nature Physics, Published online: 18 February 2021; doi:10.1038/s41567-021-01172-9

A structure of monolayer and bilayer graphene with a small twist between them shows correlated insulating states that can be tuned by changing the twist angle or applying an electric field.

Topological limits to the parallel processing capability of network architectures

Nature Physics - Πέμ, 18/02/2021 - 00:00

Nature Physics, Published online: 18 February 2021; doi:10.1038/s41567-021-01170-x

The ability to perform multiple tasks simultaneously is a key characteristic of parallel architectures. Using methods from statistical physics, this study provides analytical results that quantify the limitations of processing capacity for different types of tasks in neural networks.

Sensitive spin seeks single magnon

Nature Physics - Δευ, 15/02/2021 - 00:00

Nature Physics, Published online: 15 February 2021; doi:10.1038/s41567-021-01176-5

A quantum dot has been used to detect a single excitation among the tens of thousands of atomic nuclear spins comprising it. This result is an important step towards treating nuclear spins as a quantum memory rather than a troublesome source of noise.

Low-divergence femtosecond X-ray pulses from a passive plasma lens

Nature Physics - Δευ, 15/02/2021 - 00:00

Nature Physics, Published online: 15 February 2021; doi:10.1038/s41567-020-01158-z

X-ray pulses with low divergences are produced in a laser-wakefield accelerator by focusing electron bunches in a dense passive plasma lens.

Emergent nonlinear phenomena in a driven dissipative photonic dimer

Nature Physics - Δευ, 15/02/2021 - 00:00

Nature Physics, Published online: 15 February 2021; doi:10.1038/s41567-020-01159-y

A pair of strongly coupled photonic microresonators shows nonlinear emergent behaviour, which can be understood by incorporating interactions in the theoretical description of nonlinear optical systems.

Correlated insulating states at fractional fillings of the WS<sub>2</sub>/WSe<sub>2</sub> moiré lattice

Nature Physics - Δευ, 15/02/2021 - 00:00

Nature Physics, Published online: 15 February 2021; doi:10.1038/s41567-021-01171-w

Twisted bilayers of WS2 and WSe2 have correlated states that correspond to real-space ordering of the electrons on a length scale much longer than the moiré pattern.

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