CRITIC
img-contested
N/A
0 reviews
PUBLIC
img-contested
N/A
0 reviews
RECENT ARTICLES
NO RATING
Tailoring Magnetic Fields in Inaccessible Regions

Tailoring Magnetic Fields in Inaccessible Regions

Learn about our , including and Phys. Rev. Lett. 125, 177204 – Published 23 October 2020 Controlling magnetism, essential for a wide range of technologies, is impaired by the impossibility of generating a maximum of magnetic field in free space. Here, we propose a strategy based on negative permeability to overcome this stringent limitation. We experimentally demonstrate that an active magnetic metamaterial can emulate the field of a straight current wire at a distance. Our strategy leads to an unprecedented focusing of magnetic fields in empty space and enables the remote cancellation of...

aps.org
Oct 23
Worthy
Share
Save
Give Tip
Review
NO RATING
Shining a Light on Hidden Spin Dynamics

Shining a Light on Hidden Spin Dynamics

ViewpointSeptember 24, 2020• Physics 13, 151Researchers combine ferromagnetic resonance with x-ray reflectivity to map out the complex spin behavior of a magnetic multilayer.Since the first ghostly, skeletal image that Wilhelm Röntgen created of his wife’s hand, the remarkable ability of x rays to reveal hidden objects has become commonplace. Moreover, thanks to synchrotrons, today’s x-ray techniques can reveal much more than an object’s shape. At these facilities, the wavelength of x rays can be tuned precisely to enhance x-ray absorption and reflection at energies that coincide...

aps.org
Sep 24
Worthy
Share
Save
Give Tip
Review
NO RATING
Controlled Transport of Stored Light

Controlled Transport of Stored Light

Learn about our , including and Phys. Rev. Lett. 125, 150501 – Published 8 October 2020 Controlled manipulation, storage, and retrieval of quantum information is essential for quantum communication and computing. Quantum memories for light, realized with cold atomic samples as the storage medium, are prominent for their high storage efficiencies and lifetime. We demonstrate the controlled transport of stored light over 1.2 mm in such a storage system and show that the transport process and its dynamics only have a minor effect on the coherence of the storage. Extending the presented concept...

aps.org
Oct 8
Worthy
Share
Save
Give Tip
Review
NO RATING
The Period of the Universe’s Clock

The Period of the Universe’s Clock

FOCUSJune 19, 2020• Physics 13, 99Theorists have determined 10−33 seconds as the upper limit for the period of a universal oscillator, which could help in constructing a quantum theory of gravity.A trio of theorists has modeled time as a universal quantum oscillator and found an upper bound of seconds for the oscillator’s period. This value lies well below the shortest ticks of today’s best atomic clocks, making it unmeasurable. But the researchers say that atomic clocks could be used to indirectly confirm their model’s predictions.Physics has a time problem: In quantum mechanics,...

aps.org
Jun 19
Worthy
Share
Save
Give Tip
Review
NO RATING
Looking for Dark Matter in Neutron Star Light

Looking for Dark Matter in Neutron Star Light

SynopsisOctober 20, 2020• Physics 13, s136Radio observations of neutron stars demonstrate a way to search for axions through their expected conversion to electromagnetic waves in a star’s magnetic field.Several laboratory experiments search for axions—a dark matter candidate—using strong magnetic fields to transform axions into photons. Some of the Universe’s strongest magnetic fields surround neutron stars, so theorists have proposed also searching for axion signals in neutron star light. Now, a group has done exactly that with two radio telescopes []. The lack of a detection...

aps.org
Oct 20
Worthy
Share
Save
Give Tip
Review
NO RATING
Liquid-Crystal Vortices Focus Light

Liquid-Crystal Vortices Focus Light

FOCUSAugust 21, 2020• Physics 13, 131Vortex-like patterns of liquid-crystal molecules can interact with light in a manner akin to lenses and might be useful for all-optical information processing.Liquid crystals are famous for controlling light in flat-screen displays, usually when the crystal has its rod-shaped molecules aligned. Now researchers have shown that twirling patterns of the molecules can also interact with light, anticipating that such patterns could be the basis for all-optical computing []. Their experiments show that arrangements called topological solitons—which can...

aps.org
Aug 21
Worthy
Share
Save
Give Tip
Review
NO RATING
Exploring Futures for Particle Physics

Exploring Futures for Particle Physics

OpinionOctober 5, 2020• Physics 13, 156Particle physicists in the US are embarking on a year-long community study to examine options for the future landscape of their field.All scientists look to the future, on timescales from immediate to long-term. Particle physicists are no different, but their view is colored by projects that span decades, instruments that require large investments, and research teams that range from a few individuals to thousands. Accordingly, the global particle physics community has a special need for inclusive, coherent planning. Over the next year, US...

aps.org
Oct 5
Worthy
Share
Save
Give Tip
Review
NO RATING
The Back Page

The Back Page

American Physical Society SitesBy Carl WiemanAs the country confronts systemic racism and other forms of discrimination, those of us in higher education, including physics departments, need to reflect on how we may be inadvertently propping up these barriers. My research group has been studying the factors that determine the success of students in introductory college physics courses, and the data show how physics instruction and the current curriculum is supporting systemic discrimination. A primary enabling factor is the concept that students can be classified in terms of their “talent,”...

aps.org
Oct 17
Worthy
Share
Save
Give Tip
Review
NO RATING
Modeling ball possession dynamics in the game of football

Modeling ball possession dynamics in the game of football

Learn about our , including and covering statistical, nonlinear, biological, and soft matter physicsPhys. Rev. E 102, 042120 – Published 15 October 2020See synopsis: In this paper, we study interaction dynamics in the game of football–soccer in the context of ball possession intervals. To do so, we analyze a database comprising one season of the five major football leagues of Europe. Using this input, we developed a stochastic model based on three agents: two teammates and one defender. Despite its simplicity, the model is able to capture, in good approximation, the statistical behavior of...

aps.org
Oct 15
Worthy
Share
Save
Give Tip
Review
NO RATING
Major Physics Publisher Goes Double Blind

Major Physics Publisher Goes Double Blind

Research NewsSeptember 18, 2020• Physics 13, 148In an effort to increase fairness, the Institute of Physics Publishing plans to anonymize both reviewers and authors during the review process for its journals.On a sultry day last year in Mumbai, Mandar Deshmukh, an experimental physicist at the Tata Institute of Fundamental Research, opened the referee reports he had just received for his paper on quantum nanodevices. He was incensed. What got under his skin wasn’t the rejection itself, but the belittling tone—one reviewer called his work a “Friday-afternoon experiment.” “Would the...

aps.org
Sep 18
Worthy
Share
Save
Give Tip
Review
NO RATING
High energy QCD: Multiplicity distribution and entanglement entropy

High energy QCD: Multiplicity distribution and entanglement entropy

Learn about our , including and covering particles, fields, gravitation, and cosmologyPhys. Rev. D 102, 074008 – Published 12 October 2020 In this paper, we show that QCD at high energies leads to the multiplicity distribution (σn/σin)=(1/N) (N−1/N)n−1 (where N denotes the average number of particles) and to entanglement entropy S=lnN, confirming that the partonic state at high energy is maximally entangled. However, the value of N depends on the kinematics of the parton cascade. In particular, for deep inelastic scattering, N=xG(x,Q), where xG is the gluon structure function, while for...

aps.org
Oct 12
Worthy
Share
Save
Give Tip
Review
NO RATING
Dark Matter Detector Delivers Enigmatic Signal

Dark Matter Detector Delivers Enigmatic Signal

ViewpointOctober 12, 2020• Physics 13, 135Are the excess events detected by the XENON1T experiment a harbinger of new physics or a mundane background?The dark matter that pervades the Universe appears to be fairly inert, which is why it’s so hard to find clues to its nature. Now, an unexpected result from the XENON1T experiment is setting off a wave of excitement among dark matter hunters. Over the past fifteen years, the XENON Collaboration has designed one of the quietest and darkest laboratory environments on Earth—the perfect setting to spot an elusive dark matter particle. The...

aps.org
Oct 12
Worthy
Share
Save
Give Tip
Review
NO RATING
Theorists React to Potential Signal in Dark Matter Detector

Theorists React to Potential Signal in Dark Matter Detector

SynopsisOctober 12, 2020• Physics 13, s132A tantalizing signal reported by the XENON1T dark matter experiment has sparked theorists to investigate explanations involving new physics.On June 16, 2020, the collaboration running XENON1T—one of the world’s most sensitive dark matter detectors—reported a signal it couldn’t explain (see today’s accompanying article, ). The signal has yet to reach the “5-sigma” bar for discovery, and a mundane explanation could still be the culprit. But theorists have been quick to explore whether exotic particles or interactions might be involved. Physical...

aps.org
Oct 12
Worthy
Share
Save
Give Tip
Review
NO RATING
Quantum Simulations of Curved Space

Quantum Simulations of Curved Space

SynopsisSeptember 9, 2020• Physics 13, s114A heptagonal-lattice superconducting circuit, and the mathematics that describe it, provide tools for studying quantum mechanics in curved space.According to John Wheeler’s summary of general relativity, “space-time tells matter how to move; matter tells space-time how to curve.” How this relationship plays out at the quantum scale is not known, because extending quantum experiments to curved space poses a challenge. In 2019, Alicia Kollár and colleagues at Princeton University met that challenge with a photonic circuit that represents the...

aps.org
Sep 9
Worthy
Share
Save
Give Tip
Review
NO RATING
How Speaking Creates Droplets That May Spread COVID-19

How Speaking Creates Droplets That May Spread COVID-19

VideoOctober 2, 2020• Physics 13, 157High-speed video reveals the process that produces airborne saliva droplets during speech and also shows that lip balm can reduce droplet production.One way that COVID-19 spreads is through saliva droplets emitted during speech, but the precise mechanism that creates the droplets in the mouth is not well understood. Now Manouk Abkarian of the University of Montpellier, France, and Howard Stone of Princeton University have recorded high-speed video of the mouth of a volunteer speaking various sounds []. The duo uncovered the droplet production...

aps.org
Oct 2
Worthy
Share
Save
Give Tip
Review
NO RATING
Putting the Squeeze on General Relativity

Putting the Squeeze on General Relativity

SynopsisOctober 1, 2020• Physics 13, s128Analyzing the first image of a black hole in a nearby galaxy, researchers have provided quantitative tests of general relativity in the strongest gravitational fields yet.In 2019, the Event Horizon Telescope (EHT) released the first image of a giant black hole in the nearby galaxy M87. Revealing a circular shadow whose diameter was within 17% of predictions, the measurement provided a qualitative confirmation of general relativity while still leaving room for alternative theories of gravity. Now, a more detailed analysis by the EHT...

aps.org
Oct 1
Worthy
Share
Save
Give Tip
Review
NO RATING
Gravitational Test beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole

Gravitational Test beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole

Learn about our , including and Phys. Rev. Lett. 125, 141104 – Published 1 October 2020See synopsis: The 2017 Event Horizon Telescope (EHT) observations of the central source in M87 have led to the first measurement of the size of a black-hole shadow. This observation offers a new and clean gravitational test of the black-hole metric in the strong-field regime. We show analytically that spacetimes that deviate from the Kerr metric but satisfy weak-field tests can lead to large deviations in the predicted black-hole shadows that are inconsistent with even the current EHT measurements. We use...

aps.org
Oct 1
Worthy
Share
Save
Give Tip
Review
NO RATING
Electron Accelerator Recycles Energy for a Brighter Beam

Electron Accelerator Recycles Energy for a Brighter Beam

SynopsisJuly 23, 2020• Physics 13, s95A test electron accelerator reuses the energy of the particles in order to achieve a brighter beam without drawing more power from the grid.Linear particle accelerators (linacs) are the machines of choice for dense beams with precise energies. But compared with their circular counterparts, they have a waste problem: After one trip, the beam—and the enormous amount of energy needed to accelerate it—are lost. Researchers at Cornell University and Brookhaven National Laboratory (BNL), both in New York, have now tested a linac for electrons that...

aps.org
Jul 23
Worthy
Share
Save
Give Tip
Review
NO RATING
The Era of Anomalies

The Era of Anomalies

News FeatureMay 14, 2020• Physics 13, 79Particle physicists are faced with a growing list of “anomalies”—experimental results that conflict with the standard model but fail to overturn it for lack of sufficient evidence.To go beyond the realm of established theory, particle physicists are ready to move heaven and earth—and even giant magnets. In 2013, researchers packed up a circular magnet the width of a basketball court and sent it on a 3200-mile trip from New York to Illinois. Over the course of 35 days, the 15-ton magnet sailed down the East Coast, rounded the tip of Florida,...

aps.org
May 14
Worthy
Share
Save
Give Tip
Review
NO RATING
Equivariant Flow-Based Sampling for Lattice Gauge Theory

Equivariant Flow-Based Sampling for Lattice Gauge Theory

Learn about our , including and Phys. Rev. Lett. 125, 121601 – Published 15 September 2020 We define a class of machine-learned flow-based sampling algorithms for lattice gauge theories that are gauge invariant by construction. We demonstrate the application of this framework to U(1) gauge theory in two spacetime dimensions, and find that, at small bare coupling, the approach is orders of magnitude more efficient at sampling topological quantities than more traditional sampling procedures such as hybrid Monte Carlo and heat bath.Published by the American Physical Society under the terms of...

aps.org
Sep 15
Worthy
Share
Save
Give Tip
Review
NO RATING
Spin Current in an Antiferromagnet is Coherent

Spin Current in an Antiferromagnet is Coherent

ViewpointMay 26, 2020• Physics 13, 83Experiments show that a spin current moves as a coherent evanescent spin wave through an antiferromagnet layer sandwiched between two ferromagnets.Antiferromagnets are trending in the field of spintronics. Originally thought to be of limited use for magnetic information processing and storage, experiments now show that antiferromagnets could allow for faster and more robust memory operation than current technologies [] and for transporting spin current over long distances []. But many fundamental physics questions remain about these materials and...

aps.org
May 26
Worthy
Share
Save
Give Tip
Review
NO RATING
Sampling Photons to Simulate Molecules

Sampling Photons to Simulate Molecules

ViewpointJune 17, 2020• Physics 13, 97A quantum simulator uses microwave photons to tackle a useful chemistry problem—determining the vibronic spectra of molecules.In 2019, researchers claimed they had achieved an important milestone in quantum computing—the demonstration that a programmable quantum computer can outperform the most powerful classical computer in a specific task []. Using Google’s 53-qubit Sycamore quantum processor, they carried out, in just over three minutes, a “sampling” operation that could have taken, according to their estimates, thousands of years on a...

aps.org
Jun 17
Worthy
Share
Save
Give Tip
Review
NO RATING
Benchmarking the noise sensitivity of different parametric two-qubit gates in a single superconducting quantum computing platform

Benchmarking the noise sensitivity of different parametric two-qubit gates in a single superconducting quantum computing platform

Learn about our , including and Phys. Rev. Research 2, 033447 – Published 18 September 2020 The possibility to utilize different types of two-qubit gates on a single quantum computing platform adds flexibility in the decomposition of quantum algorithms. A larger hardware-native gate set may decrease the number of required gates, provided that all gates are realized with high fidelity. Here, we benchmark both controlled-Z (CZ) and exchange-type (iSWAP) gates using a parametrically driven tunable coupler that mediates the interaction between two superconducting qubits. Using randomized...

aps.org
Sep 18
Worthy
Share
Save
Give Tip
Review
NO RATING
Thermal Imaging of the Thomson Effect

Thermal Imaging of the Thomson Effect

ViewpointSeptember 2, 2020• Physics 13, 137Thermal images of an elusive thermoelectric effect reveal that the effect significantly increases when a magnetic field is applied to the material.The term “thermoelectric” most commonly pops up when describing how materials convert a temperature difference into an electric current, and vice versa. However, these descriptions often overlook something called the Thomson effect—an additional heating or cooling effect that arises in a conducting material that is subjected to both a charge current and a temperature gradient. Now, Ken-ichi Uchida...

aps.org
Sep 2
Worthy
Share
Save
Give Tip
Review
NO RATING
Hints of Dark Bosons

Hints of Dark Bosons

SynopsisSeptember 15, 2020• Physics 13, s115A signal predicted for a type of dark matter appears in the spectra of ytterbium isotopes.Excitement is brewing among dark-matter researchers over signs that they may have detected the first signals of this elusive substance. In June, the XENON Collaboration flashes of light that match those expected from a type of dark matter called dark bosons. Now two teams of researchers report results from another set of experiments also seeking dark bosons, with one of the teams finding hints consistent with this particle [, ].Researchers have...

aps.org
Sep 15
Worthy
Share
Save
Give Tip
Review
AUTHORS
apsmeetings

apsmeetings

CRITIC
img-contested
N/A
PUBLIC
img-contested
N/A
APSPhysicsEd

APSPhysicsEd

CRITIC
img-contested
N/A
PUBLIC
img-contested
N/A