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Binary icosahedral clusters of hard spheres in spherical confinement

Nature Physics - Δευ, 31/08/2020 - 00:00

Nature Physics, Published online: 31 August 2020; doi:10.1038/s41567-020-1003-9

The authors investigate out-of-equilibrium crystallization of a binary mixture of sphere-like nanoparticles in small droplets. They observe the spontaneous formation of an icosahedral structure with stable MgCu2 phases, which are promising for photonic applications.

Thermodynamics of a deeply degenerate SU(<i>N</i>)-symmetric Fermi gas

Nature Physics - Δευ, 31/08/2020 - 00:00

Nature Physics, Published online: 31 August 2020; doi:10.1038/s41567-020-0986-6

Ultracold alkaline-earth fermionic atoms with large number of nuclear spin states possess SU(N) symmetry. That deeply affects their interaction properties, and allows a Fermi gas of these atoms to be cooled quickly to the quantum degenerate regime.

Inside ITER

Nature Physics - Δευ, 31/08/2020 - 00:00

Nature Physics, Published online: 31 August 2020; doi:10.1038/s41567-020-1023-5

The First Plasma discharge in the ITER tokamak is expected for 2025 with deuterium–tritium plasma operation ten years later. We spoke with ITER’s Director-General, Bernard Bigot, and Tim Luce, head of ITER’s Science & Operations Department, about the current status of the project and potential future directions in fusion research.

Spectroscopic fingerprint of charge order melting driven by quantum fluctuations in a cuprate

Nature Physics - Δευ, 31/08/2020 - 00:00

Nature Physics, Published online: 31 August 2020; doi:10.1038/s41567-020-0993-7

X-ray scattering experiments show that the quantum fluctuations associated with charge order take a form that is incompatible with the idea of competition between charge order and superconductivity.

The way ahead for fusion

Nature Physics - Παρ, 28/08/2020 - 00:00

Nature Physics, Published online: 28 August 2020; doi:10.1038/s41567-020-01043-9

As the construction of the ITER tokamak enters its next phase — the machine assembly — now is a good time for a recap of the history and current status of nuclear fusion research.

Controlling the speed and trajectory of evolution with counterdiabatic driving

Nature Physics - Δευ, 24/08/2020 - 00:00

Nature Physics, Published online: 24 August 2020; doi:10.1038/s41567-020-0989-3

The unpredictability of evolution makes it difficult to deal with drug resistance because over the course of a treatment there may be mutations that we cannot predict. The authors propose to use quantum methods to control the speed and distribution of potential evolutionary outcomes.

Cooperative pattern formation in multi-component bacterial systems through reciprocal motility regulation

Nature Physics - Δευ, 24/08/2020 - 00:00

Nature Physics, Published online: 24 August 2020; doi:10.1038/s41567-020-0964-z

The authors engineer Escherichia coli into two distinct strains with tunable motility. The induced control of motility leads to the formation of patterns through a self-organizing mechanism that is specific to multi-component active systems.

Strong coupling and pressure engineering in WSe<sub>2</sub>–MoSe<sub>2</sub> heterobilayers

Nature Physics - Δευ, 24/08/2020 - 00:00

Nature Physics, Published online: 24 August 2020; doi:10.1038/s41567-020-1005-7

High-quality WSe2–MoSe2 heterostructures support strong coupling between the two layers, which is associated with tight hybridization and effective charge separation. In these structures, the bands of the interlayer excitons can be pressure-engineered.

Search for axion-like dark matter with ferromagnets

Nature Physics - Δευ, 17/08/2020 - 00:00

Nature Physics, Published online: 17 August 2020; doi:10.1038/s41567-020-1006-6

The presence of axion-like dark matter candidates is expected to induce an oscillating magnetic field, enhanced by a ferromagnet. Limits on the electromagnetic coupling strength of axion-like particles are reported over a mass range spanning three decades.

Bloch ferromagnetism of composite fermions

Nature Physics - Δευ, 17/08/2020 - 00:00

Nature Physics, Published online: 17 August 2020; doi:10.1038/s41567-020-1000-z

Composite fermions can be tuned to very low effective density in a clean two-dimensional electron gas, which allows the formation of a Bloch ferromagnet.

High-temperature quantum anomalous Hall regime in a MnBi<sub>2</sub>Te<sub>4</sub>/Bi<sub>2</sub>Te<sub>3</sub> superlattice

Nature Physics - Δευ, 17/08/2020 - 00:00

Nature Physics, Published online: 17 August 2020; doi:10.1038/s41567-020-0998-2

A three-dimensional topological magnetic superlattice structure exhibits the quantum anomalous Hall effect when the Fermi energy is tuned into the correct energy window.

Excitons in a new light

Nature Physics - Δευ, 17/08/2020 - 00:00

Nature Physics, Published online: 17 August 2020; doi:10.1038/s41567-020-1004-8

When a semiconductor is embedded inside a microcavity, infrared photons have been shown to bind electrons and holes together as excitons. This result opens the door for quantum material engineering based on light–matter interactions.

Facts are relative

Nature Physics - Δευ, 17/08/2020 - 00:00

Nature Physics, Published online: 17 August 2020; doi:10.1038/s41567-020-0984-8

The discussion of the quantum mechanical Wigner’s friend thought experiment has regained intensity. Recent theoretical results and experimental tests restrict the possibility of maintaining an observer-independent notion of measurement outcomes.

A strong no-go theorem on the Wigner’s friend paradox

Nature Physics - Δευ, 17/08/2020 - 00:00

Nature Physics, Published online: 17 August 2020; doi:10.1038/s41567-020-0990-x

For a scenario of two separated but entangled observers, inequalities are derived from three fundamental assumptions. An experiment shows that these inequalities can be violated if quantum evolution is controllable on the scale of an observer.

Excitons bound by photon exchange

Nature Physics - Δευ, 17/08/2020 - 00:00

Nature Physics, Published online: 17 August 2020; doi:10.1038/s41567-020-0994-6

Electrons and holes in doped quantum wells cannot form bound states from usual Coulomb interaction. However, when the system is embedded in a cavity, the exchange of photons provides an effective attraction, leading to the creation of bound excitons.

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