He recently co-authored an article with researchers from around the world, titled, “Mesoscopic Phase Coherence in a Quantum Spin Fluid.” Their findings will be published in the July 26 edition of the prestigious Science magazine.
The results of their research have strong implications for the design of devices and materials for quantum information processing.
The group’s main goal was to demonstrate string order – also called quantum phase coherence – and to determine the factors affecting the ability to maintain this property over a finite distance. In order to investigate this, DiTusa, together with an international team of researchers, looked at a quantum spin liquid, a system where electron spins are coupled, but point in random directions. These spins can be thought of as atomic-sized bar magnets that point in random arrangements, which is in direct contrast to the behavior of household magnets, where the spins are mostly aligned. The material in which they discovered the quantum spin liquid is composed of chains of nickel-oxygen-nickel atoms.
The group found that the string order was maintained for relatively long distances, nearly 30 nanometers, or 100 times the distance between nickel atoms in the solid state, at temperatures close to absolute zero.
“I like to think of this novel state of matter as an orchestra without a conductor, each musician playing whatever comes to mind,” said DiTusa. “Though one trumpet player likes to play Jimmie Hendrix and an oboe player likes to play Bach, a miraculous occurrence takes place and, without realizing it, the entire room of musicians becomes locked into playing a Brahms symphony.”
In this case, DiTusa contends, the whole orchestra is acting as a single coherent entity, even though they are playing different parts of a nonexistent score. This coherence has a length scale of the size of the concert hall and lasts a time determined by the length of the symphony.
“In our nickel oxide magnet, although the individual nickel atoms don’t have spins that point all in the same direction, or even form a regularly repeating pattern, they all hang together to make a beautiful, coherent symphony,” he said.
Collaborators on this research include: Guangyong Xu of Johns Hopkins University and Brookhaven National Laboratory; Collin L. Broholm, Ying Chen and Michel Kenzelmann of Johns Hopkins University and the National Institute of Standards and Technology Center for Neutron Research; Yeong-Ah Soh of Dartmouth College; Gabriel Aeppli of the London Centre for Nanotechnology and University College of London; Christopher D. Frost from the ISIS Facility, Rutherford Appleton Laboratory, U.K.; Toshimitsu Ito and Kunihiko Oka of the National Institute of Advanced Industrial Science and Technology, or AIST, in Japan; and Hidenori Takagi, also from AIST and the University of Tokyo.
For more information, contact DiTusa at email@example.com or 225-578-2606.
John F. DiTusa | EurekAlert!
Neutron star merger directly observed for the first time
17.10.2017 | University of Maryland
Breaking: the first light from two neutron stars merging
17.10.2017 | American Association for the Advancement of Science
University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
17.10.2017 | Event News
10.10.2017 | Event News
10.10.2017 | Event News
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