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Synopsis: A New Tool for Sensing Phonons in Liquid Helium

Wed, 2019-07-17 12:00

Nanomechanical resonators probe helium-4 at record low temperatures in a proof-of-concept experiment demonstrating the potential to explore fundamental properties of quantum fluids.

[Physics] Published Wed Jul 17, 2019

Categories: Physics

Synopsis: Could Levitated Nanoparticles Test Spontaneous Wave-Function Collapse?

Tue, 2019-07-16 12:00

The motion of hovering nanoparticles might reveal that quantum wave functions collapse spontaneously, but three common measurement methods are not ready for prime time.

[Physics] Published Tue Jul 16, 2019

Categories: Physics

Viewpoint: Ion Clock Busts into New Precision Regime

Mon, 2019-07-15 12:00

Author(s): Pierre Dubé

An aluminum ion clock has a fractional-frequency uncertainty of less than one part in 1018, a four-decades-long goal in precision.

[Physics 12, 79] Published Mon Jul 15, 2019

Categories: Physics

Focus: <i>Video</i>—Stop and Go Droplets

Fri, 2019-07-12 12:00

Author(s): David Ehrenstein

Liquid droplets bouncing on a vibrating liquid surface can execute a surprising cycle, alternating between moving and standing still.

[Physics 12, 80] Published Fri Jul 12, 2019

Categories: Physics

Synopsis: How Fluids Flow When the Temperature Changes

Thu, 2019-07-11 12:00

Physicists develop a theory to make the seemingly random, thermally driven motion of particles in fluids predictable.

[Physics] Published Thu Jul 11, 2019

Categories: Physics

Viewpoint: Supermassive Black Hole May Constrain Superlight Dark Matter

Wed, 2019-07-10 12:00

Author(s): Eric Armengaud

An interpretation of the black hole image taken by the Event Horizon Telescope hints of new constraints on the mass of dark matter.

[Physics 12, 78] Published Wed Jul 10, 2019

Categories: Physics

Synopsis: Focusing Ultrasound with Holographic Lenses  

Wed, 2019-07-10 12:00

3D-printed acoustic lenses can improve the performance of ultrasound beams targeting the brain by correcting for the effect of the skull.

[Physics] Published Wed Jul 10, 2019

Categories: Physics

Synopsis: Dividing Work into Quantum Chunks

Tue, 2019-07-09 12:00

Using ideas from topological materials, researchers propose a way to quantize work.

[Physics] Published Tue Jul 09, 2019

Categories: Physics

Feature: Coming Soon: Cold Atoms Impersonate Superconductors

Mon, 2019-07-08 12:00

Researchers say they are close to simulating high-temperature superconductivity using a lattice of ultracold atoms, a step toward explaining this perfectly conducting state.

[Physics 12, 76] Published Mon Jul 08, 2019

Categories: Physics

Focus: Molecular Probe Uses a Polarization Flip

Mon, 2019-07-08 12:00

Author(s): Michael Schirber

A new way of probing molecules with handedness involves a light pulse in which the polarization changes in the middle of a single wave cycle.

[Physics 12, 77] Published Mon Jul 08, 2019

Categories: Physics

Synopsis: Chemical Conversations Lead to Particle Cliques

Wed, 2019-07-03 12:00

When particles such as cells or a biological molecules leave chemical trails, a variety of clustering behaviors result, according to simulations.

[Physics] Published Wed Jul 03, 2019

Categories: Physics

Synopsis: Dandelion Fluff Perfected for Flight

Tue, 2019-07-02 12:00

Calculations show that the number of white filaments springing from the top of a dandelion seed is optimized for steady flight, allowing the seeds to cruise long distances through the air.

[Physics] Published Tue Jul 02, 2019

Categories: Physics

Synopsis: Synchronizing Nanosized “Pendulums”

Mon, 2019-07-01 12:00

Researchers synchronize the motion of two nanosized photonic crystals, showing that their “swings” match those seen for larger oscillators, such as the pendulums in grandfather clocks.

[Physics] Published Mon Jul 01, 2019

Categories: Physics

Viewpoint: Neural Networks Take on Open Quantum Systems

Fri, 2019-06-28 12:00

Author(s): Maria Schuld, Ilya Sinayskiy, and Francesco Petruccione

Simulating a quantum system that exchanges energy with the outside world is notoriously hard, but the necessary computations might be easier with the help of neural networks.

[Physics 12, 74] Published Fri Jun 28, 2019

Categories: Physics

Focus: Folded Solar Panel Opens Without Power Source

Fri, 2019-06-28 12:00

Author(s): Philip Ball

A spacecraft solar cell design uses a temperature-sensitive polymer to expand the panel’s surface area by 10 times in 40 seconds.

[Physics 12, 75] Published Fri Jun 28, 2019

Categories: Physics

Feature: Q&amp;A: The Complexities of Biominerals

Thu, 2019-06-27 12:00

Physicist Pupa Gilbert explains her fascination with the patterns and structures that form in the minerals made by living organisms.

[Physics 12, 73] Published Thu Jun 27, 2019

Categories: Physics

Viewpoint: Cooling with a Squeeze

Wed, 2019-06-26 12:00

Author(s): Jaka Tušek and Nini Pryds

A newly designed alloy exhibits a “colossal” elastocaloric effect—a temperature change under strain—making it a good candidate for an environmentally friendly type of cooling.

[Physics 12, 72] Published Wed Jun 26, 2019

Categories: Physics

Synopsis: Flexing an Electron Gas

Wed, 2019-06-26 12:00

Bending a stack of metal oxide sheets can alter the electrical resistance of a 2D electron gas that resides within.

[Physics] Published Wed Jun 26, 2019

Categories: Physics

Synopsis: Making Quantum Cryptography Safe and Practical

Tue, 2019-06-25 12:00

A theoretical study suggests that “continuous variable” quantum key distribution—an approach to quantum cryptography compatible with telecom networks—could be made absolutely secure against hacking.

[Physics] Published Tue Jun 25, 2019

Categories: Physics

Viewpoint: Microbial Expansion Shaped by Fluid Flows

Mon, 2019-06-24 12:00

Author(s): Eva Kanso and Alecia N. Septer

Fluid flows induced by nutrient gradients in the vicinity of microbial colonies help direct the expansion of those microbes into new territory.

[Physics 12, 71] Published Mon Jun 24, 2019

Categories: Physics