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Chern mosaic and Berry-curvature magnetism in magic-angle graphene

Nature Physics - Πέμ, 30/06/2022 - 00:00

Nature Physics, Published online: 30 June 2022; doi:10.1038/s41567-022-01635-7

Topological states characterized by Chern numbers are usually considered to be the global properties of a material. Now a spatial patchwork of different Chern insulator states is imaged in twisted bilayer graphene.

Enhanced performance in fusion plasmas through turbulence suppression by megaelectronvolt ions

Nature Physics - Πέμ, 30/06/2022 - 00:00

Nature Physics, Published online: 30 June 2022; doi:10.1038/s41567-022-01626-8

Experiments at the Joint European Torus tokamak show improved thermal ion confinement in the presence of highly energetic ions and Alfvénic instabilities in the plasma.

Author Correction: Highly efficient double ionization of mixed alkali dimers by intermolecular Coulombic decay

Nature Physics - Δευ, 27/06/2022 - 00:00

Nature Physics, Published online: 27 June 2022; doi:10.1038/s41567-022-01680-2

Author Correction: Highly efficient double ionization of mixed alkali dimers by intermolecular Coulombic decay

Harmonic generation in confinement

Nature Physics - Πέμ, 23/06/2022 - 00:00

Nature Physics, Published online: 23 June 2022; doi:10.1038/s41567-022-01650-8

Quantum confinement effects offer a more comprehensive understanding of the fundamental processes that drive extreme optical nonlinearities in nano-engineered solids, opening a route to unlocking the potential of high-order harmonic generation.

Size-controlled quantum dots reveal the impact of intraband transitions on high-order harmonic generation in solids

Nature Physics - Πέμ, 23/06/2022 - 00:00

Nature Physics, Published online: 23 June 2022; doi:10.1038/s41567-022-01639-3

Both inter- and intraband transitions contribute to high-harmonic generation in solids, but their exact roles are not fully understood. Experiments with quantum dots show that enhanced intraband transitions lead to increased carrier injection and thus enhanced harmonic generation.

Multimode photon blockade

Nature Physics - Πέμ, 23/06/2022 - 00:00

Nature Physics, Published online: 23 June 2022; doi:10.1038/s41567-022-01630-y

A method to engineer higher-order interactions between photons provides a route to create non-classical and entangled states across multiple modes.

Skyrmion–antiskyrmion pair creation and annihilation in a cubic chiral magnet

Nature Physics - Πέμ, 23/06/2022 - 00:00

Nature Physics, Published online: 23 June 2022; doi:10.1038/s41567-022-01638-4

Magnetic skyrmions—a type of localized spin texture—have been theoretically predicted to annihilate with counterparts known as antiskyrmions. By means of electron microscopy, such annihilation has now been observed in a cubic chiral magnet.

Rydberg quantum wires for maximum independent set problems

Nature Physics - Δευ, 20/06/2022 - 00:00

Nature Physics, Published online: 20 June 2022; doi:10.1038/s41567-022-01629-5

Combinatorial optimization is one of the areas for which quantum computing promises to overcome classical devices. An experiment with arrays of Rydberg atoms now shows how to solve combinatorial graph problems with auxiliary atomic wires.

Fractons’ exotic flow

Nature Physics - Πέμ, 16/06/2022 - 00:00

Nature Physics, Published online: 16 June 2022; doi:10.1038/s41567-022-01640-w

The hydrodynamic description of many-body quantum systems is a key part of our understanding of out-of-equilibrium physics. Exotic, highly constrained quantum particles called fractons require a treatment that goes beyond hydrodynamics.

A tetraquark trophy

Nature Physics - Πέμ, 16/06/2022 - 00:00

Nature Physics, Published online: 16 June 2022; doi:10.1038/s41567-022-01620-0

The hunt for new particles helps to complete our understanding of hadronic matter. The LHCb Collaboration now reports the surprising observation of a doubly charmed tetraquark.

Observation of an exotic narrow doubly charmed tetraquark

Nature Physics - Πέμ, 16/06/2022 - 00:00

Nature Physics, Published online: 16 June 2022; doi:10.1038/s41567-022-01614-y

The LHCb Collaboration reports the observation of an exotic, narrow, tetraquark state that contains two charm quarks, an up antiquark and a down antiquark.

Breakdown of hydrodynamics below four dimensions in a fracton fluid

Nature Physics - Πέμ, 16/06/2022 - 00:00

Nature Physics, Published online: 16 June 2022; doi:10.1038/s41567-022-01631-x

Fractons are particles that can only move in tandem, which substantially affects their thermalization. Below four spatial dimensions, an unconventional dynamical universality class can emerge as thermal fluctuations destroy hydrodynamic behaviour.

A supermassive doughnut

Nature Physics - Τρί, 14/06/2022 - 00:00

Nature Physics, Published online: 14 June 2022; doi:10.1038/s41567-022-01649-1

A supermassive doughnut

A supersolid pancake

Nature Physics - Τρί, 14/06/2022 - 00:00

Nature Physics, Published online: 14 June 2022; doi:10.1038/s41567-022-01648-2

A supersolid pancake

It’s a climate for early bloomers

Nature Physics - Τρί, 14/06/2022 - 00:00

Nature Physics, Published online: 14 June 2022; doi:10.1038/s41567-022-01632-w

It’s a climate for early bloomers

A classy material

Nature Physics - Τρί, 14/06/2022 - 00:00

Nature Physics, Published online: 14 June 2022; doi:10.1038/s41567-022-01654-4

Glass, now celebrated with a dedicated International Year, continues to fascinate.

The new kilogram for new technology

Nature Physics - Τρί, 14/06/2022 - 00:00

Nature Physics, Published online: 14 June 2022; doi:10.1038/s41567-022-01615-x

The shift of the definition of the kilogram in 2019 away from an artefact to one relying on the Planck constant inspires technological innovation, as Naoki Kuramoto elucidates.

Long-range order seen at last

Nature Physics - Τρί, 14/06/2022 - 00:00

Nature Physics, Published online: 14 June 2022; doi:10.1038/s41567-022-01627-7

Advances in precision lithography and measurement have made it possible to observe and control the magnetic phase transition in kagome artificial spin ice, which could lead to new technological devices.

The temporal rich club phenomenon

Nature Physics - Δευ, 13/06/2022 - 00:00

Nature Physics, Published online: 13 June 2022; doi:10.1038/s41567-022-01634-8

Uncovering structures in temporal networks requires different tools than in their static counterparts. A metric now quantifies whether the nodes with a large number of connections also tend to stay simultaneously connected for longer times.

Perspectives on scientific progress

Nature Physics - Δευ, 06/06/2022 - 00:00

Nature Physics, Published online: 06 June 2022; doi:10.1038/s41567-022-01637-5

Against the backdrop of various philosophical accounts, this Comment argues for the need of a human rights approach to scientific progress, which requires us to rethink how we view scientific knowledge.

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Πανεπιστήμιο Κρήτης - Τμήμα Φυσικής - Πανεπιστημιούπολη Βουτών - TK 70013 Βασιλικά Βουτών, Ελλάδα
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