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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.

Realization of an anomalous Floquet topological system with ultracold atoms

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

Nature Physics, Published online: 29 June 2020; doi:10.1038/s41567-020-0949-y

Standard topological invariants commonly used in static systems are not enough to fully capture the topological properties of Floquet systems. In a periodically driven quantum gas, chiral edge modes emerge despite all Chern numbers being equal to zero.

Berry curvature memory through electrically driven stacking transitions

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

Nature Physics, Published online: 29 June 2020; doi:10.1038/s41567-020-0947-0

A memory device is proposed that uses a dynamical modification of the stacking order of few-layer WTe2 to encode information. The change in stacking modifies both the Berry curvature and the Hall transport, allowing two states to be distinguished.

Undulation enables gliding in flying snakes

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

Nature Physics, Published online: 29 June 2020; doi:10.1038/s41567-020-0935-4

Observations of flying snakes inform the development of a dynamical model of gliding taking undulation into account. This work suggests that aerial undulation has a different function in snakes than in other animals.

Unconventional free charge in the correlated semimetal Nd<sub>2</sub>Ir<sub>2</sub>O<sub>7</sub>

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

Nature Physics, Published online: 29 June 2020; doi:10.1038/s41567-020-0955-0

Transport and optical conductivity measurements reveal the non-Fermi liquid behaviour in correlated semimetal Nd2Ir2O7. The result implies the emergent collective charge transport in this compound, not reconcilable with conventional band theory.

Origin of strong-field-induced low-order harmonic generation in amorphous quartz

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

Nature Physics, Published online: 29 June 2020; doi:10.1038/s41567-020-0943-4

Strong-field-induced nonlinearities from the injection of electrons into the conduction band contribute to harmonic generation in amorphous quartz. Close to the damage threshold, they dominate over intraband and interband contributions.

Spin phase diagram of the interacting quantum Hall liquid

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

Nature Physics, Published online: 29 June 2020; doi:10.1038/s41567-020-0946-1

The spin polarization of a quantum Hall system is determined by a spin-resolved tunnelling method. This technique shows a substantial regime where the weakly interacting composite fermion picture is not valid.

Shaken not strained

Nature Physics - Δευ, 22/06/2020 - 00:00

Nature Physics, Published online: 22 June 2020; doi:10.1038/s41567-020-0937-2

Experiments show how the magnetic order in antiferromagnets can be manipulated through lattice vibrations excited by a laser. This induces a large and reversible magnetic moment at very high speed.

Amplification of waves from a rotating body

Nature Physics - Δευ, 22/06/2020 - 00:00

Nature Physics, Published online: 22 June 2020; doi:10.1038/s41567-020-0944-3

Acoustic waves that carry orbital angular momentum are amplified as they pass through an absorbing disk when the rotation rate exceeds the frequency of the incident wave, thus providing an experimental demonstration of Zel’dovich amplification.

Predicting many properties of a quantum system from very few measurements

Nature Physics - Δευ, 22/06/2020 - 00:00

Nature Physics, Published online: 22 June 2020; doi:10.1038/s41567-020-0932-7

An efficient method has been proposed through which the properties of a complex, large-scale quantum system can be predicted without fully characterizing the quantum state.

An acoustic black hole

Nature Physics - Δευ, 22/06/2020 - 00:00

Nature Physics, Published online: 22 June 2020; doi:10.1038/s41567-020-0954-1

An elegant experiment showing that acoustic waves are amplified after scattering by a rotating body demonstrates an effect predicted in 1971 by Yakov Zel’dovich. This result has implications for the understanding of scattering from black holes.

Probing chiral edge dynamics and bulk topology of a synthetic Hall system

Nature Physics - Δευ, 22/06/2020 - 00:00

Nature Physics, Published online: 22 June 2020; doi:10.1038/s41567-020-0942-5

The quantum Hall effect is realized in a two-dimensional quantum gas system consisting of one spatial dimension and one synthetic dimension encoded in the atomic spin. Measurements show distinct bulk properties rooted in the topological structure.

Polarizing an antiferromagnet by optical engineering of the crystal field

Nature Physics - Δευ, 22/06/2020 - 00:00

Nature Physics, Published online: 22 June 2020; doi:10.1038/s41567-020-0936-3

This paper shows how lattice distortions induced by a laser pulse can create a ferrimagnetic moment in an antiferromagnet. This mechanism gives a magnetic response that is orders of magnitude larger than using mechanical strain.

Author Correction: A brief history of nuclear fusion

Nature Physics - Πέμ, 18/06/2020 - 00:00

Nature Physics, Published online: 18 June 2020; doi:10.1038/s41567-020-0966-x

Author Correction: A brief history of nuclear fusion

Ring a ring o’ pulses

Nature Physics - Πέμ, 18/06/2020 - 00:00

Nature Physics, Published online: 18 June 2020; doi:10.1038/s41567-020-0945-2

Quantum cascade lasers are bright and compact semiconductor lasers that emit light in the mid- to far-infrared spectral region. The use of a closed ring cavity has now set them on the path towards ultrafast pulses.

Universal elastic mechanism for stinger design

Nature Physics - Δευ, 15/06/2020 - 00:00

Nature Physics, Published online: 15 June 2020; doi:10.1038/s41567-020-0930-9

The structures of stingers of living organisms are surprisingly similar despite their vastly different lengths. Now, stingers are found to obey a unifying mechanistic principle that characterizes the stingers resistance to buckling.

Experimental extraction of the quantum effective action for a non-equilibrium many-body system

Nature Physics - Δευ, 15/06/2020 - 00:00

Nature Physics, Published online: 15 June 2020; doi:10.1038/s41567-020-0933-6

The quantum effective action describing non-equilibrium dynamics of a many-body system can be inferred from experiment using analogue quantum simulators. Here is an example of how it works for a quasi-one-dimensional spinor Bose gas out of equilibrium.

Human information processing in complex networks

Nature Physics - Δευ, 15/06/2020 - 00:00

Nature Physics, Published online: 15 June 2020; doi:10.1038/s41567-020-0924-7

The arrangement of a sequence of stimuli affects how humans perceive information. Here, the authors show experimentally that humans perceive information in a way that depends on the network structure of stimuli.

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