Physics Department - Extern RSS Feeds

Observation of energy-resolved many-body localization

Nature Physics - Δευ, 21/09/2020 - 00:00

Nature Physics, Published online: 21 September 2020; doi:10.1038/s41567-020-1035-1

Many-body localization—a phenomenon where an isolated system fails to reach thermal equilibrium—has been studied with a programmable quantum processor, which reveals the crucial role played by the initial energy on the onset of localization.

Ultrasound evidence for a two-component superconducting order parameter in Sr<sub>2</sub>RuO<sub>4</sub>

Nature Physics - Δευ, 21/09/2020 - 00:00

Nature Physics, Published online: 21 September 2020; doi:10.1038/s41567-020-1033-3

Ultrasound experiments show that the superconducting order parameter in strontium ruthenate must have two components.

Morphology selection kinetics of crystallization in a sphere

Nature Physics - Δευ, 21/09/2020 - 00:00

Nature Physics, Published online: 21 September 2020; doi:10.1038/s41567-020-0991-9

The authors investigate the role of spherical confinement and curvature-induced topological defects on the crystallization of charged colloids. They conclude that crystallization in spherical confinement is due to a combination of thermodynamics and kinetic pathways.

Chemotaxis under flow disorder shapes microbial dispersion in porous media

Nature Physics - Δευ, 14/09/2020 - 00:00

Nature Physics, Published online: 14 September 2020; doi:10.1038/s41567-020-1002-x

Bacteria live in heterogeneous environments, so it is important to investigate their behaviour in porous media. Here the authors show that flow disorder enhances the effect of chemical gradients in micropockets in a porous medium, which then aid the transport of bacteria.

Generalized superradiance for producing broadband coherent radiation with transversely modulated arbitrarily diluted bunches

Nature Physics - Δευ, 14/09/2020 - 00:00

Nature Physics, Published online: 14 September 2020; doi:10.1038/s41567-020-0995-5

A new form of superradiance is predicted that ‘in contrast to the standard effect’ arises even for vanishing numbers of particles per wavelength. This finding may enable coherent emission in plasma accelerators.

Weak-to-strong transition of quantum measurement in a trapped-ion system

Nature Physics - Δευ, 14/09/2020 - 00:00

Nature Physics, Published online: 14 September 2020; doi:10.1038/s41567-020-0973-y

A weak-to-strong quantum measurement transition has been observed in a single-trapped-ion system, where the ion’s internal electronic state and its vibrational motion play the roles of the measured system and the measuring pointer.

Symmetry breaking in twisted double bilayer graphene

Nature Physics - Δευ, 14/09/2020 - 00:00

Nature Physics, Published online: 14 September 2020; doi:10.1038/s41567-020-1030-6

Transport measurements show that spontaneous symmetry breaking plays a crucial role in the correlated insulating and metallic states in twisted double bilayer graphene.

Underground test of gravity-related wave function collapse

Nature Physics - Δευ, 07/09/2020 - 00:00

Nature Physics, Published online: 07 September 2020; doi:10.1038/s41567-020-1008-4

The radiation emission rate from gravity-related wave function collapse is calculated and the results of a dedicated experiment at the Gran Sasso laboratory are reported, ruling out the natural parameter-free version of the Diósi–Penrose model.

Black metal hydrogen above 360 GPa driven by proton quantum fluctuations

Nature Physics - Δευ, 07/09/2020 - 00:00

Nature Physics, Published online: 07 September 2020; doi:10.1038/s41567-020-1009-3

Numerical calculations that include the quantum fluctuations of protons explain the optical properties of hydrogen at high pressure.

Structure determines where crystallization occurs in a soft colloidal glass

Nature Physics - Δευ, 07/09/2020 - 00:00

Nature Physics, Published online: 07 September 2020; doi:10.1038/s41567-020-1016-4

Softness, a machine-learned structural quantity, has been recently identified as a parameter that characterizes glassy dynamics. Here, the authors observe devitrification in 3D soft colloidal glasses and find that softness may indicate regions predisposed to crystallization.

A massive test

Nature Physics - Δευ, 07/09/2020 - 00:00

Nature Physics, Published online: 07 September 2020; doi:10.1038/s41567-020-1026-2

Although quantum mechanics is essential to understand microscopic systems, it has little effect on heavier objects. Experiments have now put strict constraints on theories that use gravity to explain the absence of large-scale quantum effects.

Zero-bias peaks at zero magnetic field in ferromagnetic hybrid nanowires

Nature Physics - Δευ, 07/09/2020 - 00:00

Nature Physics, Published online: 07 September 2020; doi:10.1038/s41567-020-1017-3

By incorporating a ferromagnetic layer in their superconductor–semiconductor nanowire hybrid device, Vaitiekėnas et al. show that zero-bias peaks—potential Majorana bound states—can be induced without an external magnetic field.

The other corona

Nature Physics - Πέμ, 03/09/2020 - 00:00

Nature Physics, Published online: 03 September 2020; doi:10.1038/s41567-020-01044-8

The other corona

Just a moment

Nature Physics - Πέμ, 03/09/2020 - 00:00

Nature Physics, Published online: 03 September 2020; doi:10.1038/s41567-020-1022-6

Wolfgang Pauli introduced the Bohr magneton as a fundamental unit of magnetic moment during an effort to find a quantum basis for magnetism, as Davide Castelvecchi recounts.

Consider a pendulum

Nature Physics - Πέμ, 03/09/2020 - 00:00

Nature Physics, Published online: 03 September 2020; doi:10.1038/s41567-020-01047-5

Consider a pendulum

Hot and cold

Nature Physics - Πέμ, 03/09/2020 - 00:00

Nature Physics, Published online: 03 September 2020; doi:10.1038/s41567-020-01045-7

Hot and cold

A chip for laser cooling

Nature Physics - Πέμ, 03/09/2020 - 00:00

Nature Physics, Published online: 03 September 2020; doi:10.1038/s41567-020-01048-4

A chip for laser cooling

Direct observation of anyonic braiding statistics

Nature Physics - Πέμ, 03/09/2020 - 00:00

Nature Physics, Published online: 03 September 2020; doi:10.1038/s41567-020-1019-1

An interferometer device is used to detect the quantum-mechanical phase that is gained when two anyons are braided around each other. The fractional value of the phase proves that these quasiparticles are neither bosons nor fermions.

Braiding photonic topological zero modes

Nature Physics - Πέμ, 03/09/2020 - 00:00

Nature Physics, Published online: 03 September 2020; doi:10.1038/s41567-020-1007-5

The non-zero geometric phase acquired by the braiding of vortex modes in photonic waveguide lattices demonstrates their potential to serve as a platform for the study of both Abelian and non-Abelian braiding in bosonic systems.

Managing the infodemic

Nature Physics - Πέμ, 03/09/2020 - 00:00

Nature Physics, Published online: 03 September 2020; doi:10.1038/s41567-020-01039-5

Managing the infodemic

Σελίδες

Subscribe to Τμήμα Φυσικής συλλέκτης - Physics Department - Extern RSS Feeds

Πανεπιστήμιο Κρήτης - Τμήμα Φυσικής - Πανεπιστημιούπολη Βουτών - TK 70013 Βασιλικά Βουτών, Ελλάδα
τηλ: +30 2810 394300 - fax: +30 2810 394301