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Non-Abelian reciprocal braiding of Weyl points and its manifestation in ZrTe

Nature Physics - Δευ, 13/07/2020 - 00:00

Nature Physics, Published online: 13 July 2020; doi:10.1038/s41567-020-0967-9

Weyl points in three-dimensional systems with certain symmetry carry non-Abelian topological charges, which can be transformed via non-trivial phase factors that arise upon braiding these points inside the reciprocal space.

Author Correction: Human information processing in complex networks

Nature Physics - Τρί, 07/07/2020 - 00:00

Nature Physics, Published online: 07 July 2020; doi:10.1038/s41567-020-0985-7

Author Correction: Human information processing in complex networks

Quantum breakdown of superconductivity in low-dimensional materials

Nature Physics - Τρί, 07/07/2020 - 00:00

Nature Physics, Published online: 07 July 2020; doi:10.1038/s41567-020-0905-x

The breakdown of superconductivity is described as a reduction in the amplitude of the order parameter or a breakdown in phase coherence of Cooper pairs. This Review Article highlights recent results that show both mechanisms may be at play simultaneously.

Topological superconductivity in hybrid devices

Nature Physics - Τρί, 07/07/2020 - 00:00

Nature Physics, Published online: 07 July 2020; doi:10.1038/s41567-020-0925-6

Hybrid devices of superconductors and semiconductor nanowires may be topological and host majorana. This Perspective summarizes the current situation of the field, and highlights the developments in materials science required to make progress.

Emergent Superconductivity

Nature Physics - Τρί, 07/07/2020 - 00:00

Nature Physics, Published online: 07 July 2020; doi:10.1038/s41567-020-0969-7

This month, a Focus issue highlights recent developments in fundamental research on superconductivity.

A defect determines strength

Nature Physics - Τρί, 07/07/2020 - 00:00

Nature Physics, Published online: 07 July 2020; doi:10.1038/s41567-020-0961-2

When you start tearing a piece of aluminium foil apart, you create dislocations in the material. Suhas Eswarappa Prameela and Tim Weihs recount the story of the Burgers vector that is now an indispensable tool for describing dislocations.

Squeezing hots up

Nature Physics - Τρί, 07/07/2020 - 00:00

Nature Physics, Published online: 07 July 2020; doi:10.1038/s41567-019-0770-7

Squeezed light is useful for metrology and quantum information. An optomechanical squeezed light source that works at room temperature will facilitate the technological applications of quantum light.

Room-temperature optomechanical squeezing

Nature Physics - Τρί, 07/07/2020 - 00:00

Nature Physics, Published online: 07 July 2020; doi:10.1038/s41567-020-0877-x

The ability to create optomechanically squeezed light at room temperature across a frequency range in the audio band could improve the measurement precision of future interferometric detectors for gravitational waves.

Living up to the promise

Nature Physics - Τρί, 07/07/2020 - 00:00

Nature Physics, Published online: 07 July 2020; doi:10.1038/s41567-020-0962-1

Living up to the promise

Flat bands in twisted bilayer transition metal dichalcogenides

Nature Physics - Δευ, 06/07/2020 - 00:00

Nature Physics, Published online: 06 July 2020; doi:10.1038/s41567-020-0958-x

Using scanning tunnelling spectroscopy, the flat bands in twisted bilayer WSe2 are shown near both 0° and 60° twist angles.

Toward noise-robust quantum advantage

Nature Physics - Δευ, 06/07/2020 - 00:00

Nature Physics, Published online: 06 July 2020; doi:10.1038/s41567-020-0960-3

Near-term quantum computations are susceptible to noise that — left uncorrected — can destroy the correlations responsible for quantum computational speedups. New work develops tools for bolstering the noise resilience of these speedups.

Fragility of time-reversal symmetry protected topological phases

Nature Physics - Δευ, 06/07/2020 - 00:00

Nature Physics, Published online: 06 July 2020; doi:10.1038/s41567-020-0956-z

When a quantum system couples with its surroundings, macroscopic irreversibility emerges even though the microscopic Hamiltonian is itself time-reversal symmetric, causing the phenomena associated with certain symmetry-protected topological phases to be unstable.

Continuous monitoring of a trapped superconducting spin

Nature Physics - Δευ, 06/07/2020 - 00:00

Nature Physics, Published online: 06 July 2020; doi:10.1038/s41567-020-0952-3

A quasiparticle in Andreev levels was coupled to a superconducting microwave resonator and its spin was monitored in real time. This has potential applications in the readout of superconducting spin qubits and measurements of Majorana fermions.

Macromolecular crowding acts as a physical regulator of intracellular transport

Nature Physics - Δευ, 06/07/2020 - 00:00

Nature Physics, Published online: 06 July 2020; doi:10.1038/s41567-020-0957-y

The native environment of the cell is crowded by DNA, proteins and other biomolecules. Here, the authors show that crowding slows down groups of kinesin motors but has no effect on single motors.

Quantum advantage with noisy shallow circuits

Nature Physics - Δευ, 06/07/2020 - 00:00

Nature Physics, Published online: 06 July 2020; doi:10.1038/s41567-020-0948-z

Uncorrected noise prevents quantum computers from running deep algorithms and outperforming classical machines. A method is now reported that allows noisy shallow quantum algorithms to be used to solve classically hard problems.

Hidden magnetism at the pseudogap critical point of a cuprate superconductor

Nature Physics - Δευ, 06/07/2020 - 00:00

Nature Physics, Published online: 06 July 2020; doi:10.1038/s41567-020-0950-5

NMR and ultrasound measurements show that the spin-glass phase exists in a cuprate all the way up to the doping that marks the end of the pseudogap phase. This highlights the possible connection between the pseudogap and Mott physics.

Tunable strain soliton networks confine electrons in van der Waals materials

Nature Physics - Δευ, 06/07/2020 - 00:00

Nature Physics, Published online: 06 July 2020; doi:10.1038/s41567-020-0953-2

By sliding one layer with respect to the other in a van der Waals heterostructure, Edelberg et al. create a honeycomb network of solitons. Vertices of the network trap electrons, allowing strain-tunable control of confined states.

Driving toward hot new phases

Nature Physics - Πέμ, 02/07/2020 - 00:00

Nature Physics, Published online: 02 July 2020; doi:10.1038/s41567-020-0963-0

Novel non-equilibrium phases of matter have recently become the focus of intense interest. The realization of topological phases which cannot exist under the constraints of thermodynamic equilibrium is a key aim.

Author Correction: Polarizing an antiferromagnet by optical engineering of the crystal field

Nature Physics - Τρί, 30/06/2020 - 00:00

Nature Physics, Published online: 30 June 2020; doi:10.1038/s41567-020-0977-7

Author Correction: Polarizing an antiferromagnet by optical engineering of the crystal field

Stable gliding by undulating snakes

Nature Physics - Δευ, 29/06/2020 - 00:00

Nature Physics, Published online: 29 June 2020; doi:10.1038/s41567-020-0959-9

Everybody who has ever made a paper airplane and been disappointed as it spins out of control, crashing to the ground, knows how tricky achieving suitable trim and stability for gliding can be. But, somehow, wiggling flying snakes glide without tumbling.

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