Archive for the ‘particle physics’ category: Page 8

May 17, 2019

Extraordinarily transparent compact metallic metamaterials

Posted by in categories: nanotechnology, particle physics

In materials science, achromatic optical components can be designed with high transparency and low dispersion. Materials scientists have shown that although metals are highly opaque, densely packed arrays of metallic nanoparticles with more than 75 percent metal by volume can become more transparent to infrared radiation than dielectrics such as germanium. Such arrays can form effective dielectrics that are virtually dispersion-free across ultra-broadband ranges of wavelengths to engineer a variety of next-generation metamaterial-based optical devices.

Scientists can tune the local refractive indices of such by altering the size, shape and spacing of to design gradient-index lenses that guide and on the microscale. The can be strongly concentrated in the gaps between metallic nanoparticles for the simultaneous focusing and ‘squeezing’ of the dielectric field to produce strong, doubly enhanced hotspots. Scientists can use these hotspots to boost measurements made using infrared spectroscopy and other non-linear processes across a broad frequency range.

In a recent study now published in Nature Communications, Samuel J. Palmer and an interdisciplinary research team in the departments of Physics, Mathematics and Nanotechnology in the U.K., Spain and Germany, showed that artificial dielectrics can remain highly transparent to infrared radiation and observed this outcome even when the particles were nanoscopic. They demonstrated the electric field penetrates the particles (rendering them imperfect for conduction) for strong interactions to occur between them in a tightly packed arrangement. The results will allow materials scientists to design optical components that are achromatic for applications in the mid-to-infrared wavelength region.

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May 17, 2019

Single molecule magnet used as a scanning magnetometer

Posted by in categories: materials, particle physics

A team of researchers from the University of California and Fudan University has developed a way to use a single molecule magnet as a scanning magnetometer. In their paper published in the journal Science, the group outlines their research which involved demonstrating their sensor scanning the spin and magnetic properties of a molecule embedded in another material.

As scientists continue their quest to squeeze ever more data onto increasingly smaller storage devices, they are exploring the possibility of using the magnetic state of a or even an atom—likely the smallest possible memory element type. In this new effort, the researchers have demonstrated that it is possible to use a single molecule affixed to a sensor to read the properties of a single molecule in another material.

To create their sensor and , the researchers first absorbed magnetic of Ni(cyclopentadienyl)2 onto a plate coated with silver. Then, they pulled a nickelocene molecule from the silver surface and applied it to the tip of a scanning tunneling microscope sensor. Next, they heated an adsorbate-covered surface to 600 millikelvin and then moved the sensor tipped with the single molecule close to the surface and read the signals received by the probe as the two molecules interacted.

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May 17, 2019

One Man’s Unlikely Quest to Power the World With Magnets

Posted by in category: particle physics

Dennis Danzik has invented a whirligig that calls for the suspension of disbelief and the laws of physics. If it works as advertised, it would rank with the harnessing of steam, electricity and the atom.

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May 17, 2019

Quantum Tunneling is Near Instantaneous, Experiments Show

Posted by in categories: particle physics, quantum physics

Tunneling, a key feature of quantum mechanics, is when a particle that encounters a seemingly insurmountable barrier passes through it, ending up on the other side. A series of experiments carried out by physicists from Griffith University, Lanzhou University, the Australian National University, Drake University and Korea’s Institute for Basic Science has definitively determined the tunneling delay, which is also the time it takes for an electron to get out or ionize from a hydrogen atom.

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May 17, 2019

Wireless neutrino network could pass through the center of the Earth

Posted by in categories: particle physics, space

Scientists working at the Fermi National Accelerator Laboratory (Fermilab) near Chicago have successfully communicated a short digital message using a stream of neutrinos. While this sounds cool, the truly exceptional bit is that the message was transmitted through 790 feet (240m) of solid stone.

Neutrinos are subatomic particles (like electrons or quarks, or the theorized Higgs boson) that have almost zero mass, a neutral charge (thus their name), and travel at close to the speed of light. Unlike almost every other particle in the universe, neutrinos are unaffected by electromagnetism (because of their neutral charge), and only subject to gravity and weak nuclear force. This means that neutrinos can easily pass through solid objects as large as planets. Every second, 65 billion neutrinos from the Sun pass through each square centimeter of the Earth at almost the speed of light.

To recreate this effect, the Fermilab scientists used a particle accelerator (NuMI) to shoot a stream of neutrinos through 240 meters of stone at the MINERvA neutrino detector. If MINERvA detected neutrinos, it registered as a binary 1; no neutrinos, binary 0. Using this technique (pictured above), the scientists, with a burst of originality to rival Alexander Graham Bell himself, transmitted the word “neutrino.”

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May 17, 2019

How To Catch A Neutrino

Posted by in categories: electronics, particle physics

Francis Halzen, the lead scientist of the IceCube Neutrino Detector, explains how light sensors buried deep in the ice at the South Pole detected a neutrino that traveled four billion light-years.

May 17, 2019

Quantum cloud computing with self-check

Posted by in categories: chemistry, computing, particle physics, quantum physics

With a quantum coprocessor in the cloud, physicists from Innsbruck, Austria, open the door to the simulation of previously unsolvable problems in chemistry, materials research or high-energy physics. The research groups led by Rainer Blatt and Peter Zoller report in the journal Nature how they simulated particle physics phenomena on 20 quantum bits and how the quantum simulator self-verified the result for the first time.

Many scientists are currently working on investigating how quantum advantage can be exploited on hardware already available today. Three years ago, physicists first simulated the spontaneous formation of a pair of elementary particles with a digital quantum computer at the University of Innsbruck. Due to the error rate, however, more complex simulations would require a large number of quantum bits that are not yet available in today’s quantum computers. The analog simulation of quantum systems in a quantum computer also has narrow limits. Using a new method, researchers around Christian Kokail, Christine Maier und Rick van Bijnen at the Institute of Quantum Optics and Quantum Information (IQOQI) of the Austrian Academy of Sciences have now surpassed these limits. They use a programmable ion trap quantum computer with 20 quantum bits as a quantum coprocessor, in which quantum mechanical calculations that reach the limits of classical computers are outsourced.

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May 16, 2019

“Atom-Thick” Fibers Will Lead To Amazingly Light Phones, Says Researcher

Posted by in categories: mobile phones, particle physics

All thanks to atomic “sewing.”

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May 16, 2019

Researchers create ‘thinnest possible’ LEDs at only three atoms thick

Posted by in categories: futurism, particle physics

LEDs are already pretty tiny, but they just got a whole lot smaller. Researchers at the University of Washington have built what they say are the “thinnest-possible LEDs” — tiny lights that measure just three atoms thick. “Such thin and foldable LEDs are critical for future portable and integrated electronic devices,” Xiaodong Xu, co-author of a paper on the research that was published over the weekend in Nature Nanotechnology, says in a statement. At three atoms thick, the researchers’ LEDs are said to be 10 to 20 times thinner than conventional LEDs, opening up a number of potential new uses for them.

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May 16, 2019

For a Split Second, a Quantum Computer Made History Go Backward

Posted by in categories: computing, particle physics, quantum physics

Using a quantum computer, physicists successfully reversed time for an artificial atom. You can even try it at home.

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