Physics Department - Extern RSS Feeds

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.

Locality resolved

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

Nature Physics, Published online: 06 June 2022; doi:10.1038/s41567-022-01636-6

Two-dimensional model glasses exhibit characteristics in their low-frequency vibrational density of states that can be traced to the quasilocalized dynamics of string-like objects. This finding provides an explanation for a universal feature of glasses known as the boson peak.

Origin of the boson peak in amorphous solids

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

Nature Physics, Published online: 06 June 2022; doi:10.1038/s41567-022-01628-6

The relation between physical properties and structure in amorphous materials is poorly understood. Simulations now show that vibrations of string-like dynamical defects likely govern the low-temperature dynamics in these systems.

Disruption prediction with artificial intelligence techniques in tokamak plasmas

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

Nature Physics, Published online: 06 June 2022; doi:10.1038/s41567-022-01602-2

Tokamak plasmas are prone to sudden collapses that terminate the nuclear fusion reactions. This perspective discusses the prediction of these so-called disruptions with artificial intelligence techniques.

Cascade of isospin phase transitions in Bernal-stacked bilayer graphene at zero magnetic field

Nature Physics - Πέμ, 02/06/2022 - 00:00

Nature Physics, Published online: 02 June 2022; doi:10.1038/s41567-022-01616-w

The flat portions of the band structure in bilayer graphene are shown to support interaction-driven symmetry-broken states, similar to moiré heterostructures.

Measurement-induced quantum phases realized in a trapped-ion quantum computer

Nature Physics - Πέμ, 02/06/2022 - 00:00

Nature Physics, Published online: 02 June 2022; doi:10.1038/s41567-022-01619-7

Many-body open quantum systems are predicted to undergo a phase transition towards a pure state through frequent projective measurements. The phases separated by this transition have now been observed with random circuits on a trapped-ion computer.

Publisher Correction: High-fidelity three-qubit <i>i</i>Toffoli gate for fixed-frequency superconducting qubits

Nature Physics - Δευ, 30/05/2022 - 00:00

Nature Physics, Published online: 30 May 2022; doi:10.1038/s41567-022-01647-3

Publisher Correction: High-fidelity three-qubit iToffoli gate for fixed-frequency superconducting qubits

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