Physicists made photons be friends with magnons
(Press-News.org) A team of scientists from NUST MISIS and MIPT have developed and tested a new platform for realization of the ultra-strong photon-to-magnon coupling. The proposed system is on-chip and is based on thin-film hetero-structures with superconducting, ferromagnetic and insulating layers. This discovery solves a problem that has been on the agenda of research teams from different countries for the last 10 years, and opens new opportunities in implementing quantum technologies. The study was published in the highly ranked journal Science Advances.
The last decade has seen significant progress in the development of artificial quantum systems. Scientists are exploring different platforms, each with its own advantages and disadvantages. The next critical step for advancing quantum industry requires an efficient method of information exchange between platform hybrid systems that could benefit from distinct platforms. For example, hybrid systems based on collective spin excitations, or magnons, are being developed. In such systems, magnons must interact with photons, standing electromagnetic waves trapped in a resonator. The main limiting factor for developing such systems is the fundamentally weak interaction between photons and magnons. They are of different sizes, and follow different dispersion laws. This size difference of a hundred times or more considerably complicates the interaction.
Scientists from MIPT together with their colleagues managed to create a system with what is called the ultra-strong photon-to-magnon coupling.
Vasily Stolyarov, deputy head of the MIPT Laboratory of Topological Quantum Phenomena in Superconducting Systems, commented: "We created two subsystems. In one, being a sandwich from superconductor/insulator/superconductor thin films, photons are slowed down, their phase velocity is reduced. In another one, which is also a sandwich from superconductor/ferromagnetic/superconductor thin ?lms, superconducting proximity at both interfaces enhances the collective spin eigen-frequencies. The ultra strong photon-to-magnon coupling is achieved thanks to the suppressed photon phase velocity in the electromagnetic subsystem."
Igor Golovchanskiy, leading researcher, senior researcher at the MIPT Laboratory of Topological Quantum Phenomena in Superconducting Systems, head of the NUST MISIS Laboratory of Cryogenic Electronic Systems, explained: "Photons interact very weakly with magnons. We managed to create a system in which these two types of excitations interact very strongly. With the help of superconductors, we have significantly reduced the electromagnetic resonator. This resulted in a hundred times reduction of the phase velocity of photons, and their interaction with magnons increased by several times."
This discovery will accelerate the implementation of hybrid quantum systems, as well as open up new possibilities in superconducting spintronics and magnonics.
Except for the researchers from the MIPT Laboratory of Topological Quantum Phenomena in Superconducting Systems, the study involved scientists from NUST MISIS, the N.L. Dukhov All-Russian Scientific Research Institute of Automatics, the Institute of Solid State Physics, RAS; the Skobeltsyn Institute of Nuclear Physics, the University of Glasgow (United Kingdom), the University of Twente (Netherlands), and the Karlsruhe Institute of Technology (Germany).
This research was supported by the Ministry of Science and Higher Education of the Russian Federation, the Russian Science Foundation, and partially by the European Union Horizon 2020 program.
[Attachments] See images for this press release:
ELSE PRESS RELEASES FROM THIS DATE:
AMHERST, Mass. - Millions of Americans will visit New England's beaches this summer to cool off, play in the waves and soak up the sun. Until now, the factors governing which beaches slope gradually to the sea and which ones end abruptly in a steep drop-off have been largely unknown. However, new research from the University of Massachusetts Amherst reveals, with unprecedented detail, how the grain size of beach sand relates to the slope of the beach itself. These new findings are critical to understanding how New England's beaches will respond to both rising sea levels and increased storm activity.
Many of New England's beaches are made up of a mixture of sand and small stones. Or, to be more precise, the grain sizes on these beaches are "bi-modal" ...
WASHINGTON -- Although quantum technology has proven valuable for highly precise timekeeping, making these technologies practical for use in a variety of environments is still a key challenge. In an important step toward portable quantum devices, researchers have developed a new high-flux and compact cold-atom source with low power consumption that can be a key component of many quantum technologies.
"The use of quantum technologies based on laser-cooled atoms has already led to the development of atomic clocks that are used for timekeeping on a national level," said research team ...
New findings published this week in Physical Review Letters, Measurement of the Iron Spectrum in Cosmic Rays from 10??GeV/n to 2.0??TeV/n with the Calorimetric Electron Telescope on the International Space Station, suggest that cosmic ray nuclei of hydrogen, carbon and oxygen travel through the galaxy toward Earth in a similar way, but, surprisingly, that iron arrives at Earth differently.
A series of recent publications based on results from the CALorimetric Electron Telescope, or CALET, instrument on the International Space Station, or ISS, have cast new light on the abundance of high-energy cosmic ray nuclei -- atoms stripped of their ...
The human intestine is made up of more than 40 square meters of tissue, with a multitude of folds on its internal surface that resemble valleys and mountain peaks in order to increase the absorption of nutrients. The intestine also has the unique characteristic of being in a continuous state of self-renewal. This means that approximately every 5 days all the cells of its inner walls are renewed to guarantee correct intestinal function. Until now, scientists knew that this renewal could take place thanks to stem cells, which are protected in the so-called intestinal crypts, and which give rise to new differentiated cells. However, the process that leads to the concave shape of the crypts and the migration of new cells towards the intestinal peaks was unknown.
Now, an international ...
Extreme heat waves in urban areas are much more likely than previously thought, according to a new modeling approach designed by researchers including University of Illinois Urbana-Champaign Civil and Environmental Engineering (CEE) assistant professor Lei Zhao and alumnus Zhonghua Zheng (MS 16, PhD 20). Their paper with co-author Keith W. Oleson of the National Center for Atmospheric Research, "Large model structural uncertainty in global projections of urban heat waves," is published in the journal Nature Communications.
Urban heat waves (UHWs) can be devastating; a 1995 heat wave in Chicago caused more than 1,000 deaths. Last year's heat wave on the west coast caused wildfires. ...
In a new publication from Opto-Electronic Advances; DOI https://doi.org/10.29026/oea.2021.200006, Researchers led by Professor Junsuk Rho from Pohang University of Science and Technology (POSTECH), South Korea consider switchable diurnal radiative cooling by doped VO2.
As the impacts of climate change are increasingly felt, thermoregulation technologies that do not consume external energy have attracted considerable attention in the field of energy-saving applications. Radiative cooling has received much research interest for its ability to cool an object even under direct solar illumination. Nanostructured materials, or multi-stacked layers, can be designed to control reflection and emission spectrum ...
Researchers at Tampere University and their collaborators have shown how spectroscopic measurements can be made much faster. By correlating polarization to the colour of a pulsed laser, the team can track changes in the spectrum of the light by simple and extremely fast polarization measurements. The method opens new possibilities to measure spectral changes on a nanosecond time scale over the entire colour spectrum of light.
In spectroscopy, often the changes of the wavelength, i.e. colour, of a probe light are measured after interaction with a sample. Studying these changes is one of the key methods to gain a deeper understanding of the properties ...
Biologists at the Universities of Bath and Vienna have discovered 71 new 'imprinted' genes in the mouse genome, a finding that takes them a step closer to unravelling some of the mysteries of epigenetics - an area of science that describes how genes are switched on (and off) in different cells, at different stages in development and adulthood.
To understand the importance of imprinted genes to inheritance, we need to step back and ask how inheritance works in general. Most of the thirty trillion cells in a person's body contain genes that come from both their mother and father, with each parent contributing one version of each gene. The unique combination of genes goes part of ...
Fat biomolecules in the blood, called "serum lipids," are necessary evils. They play important roles in the lipid metabolism and are integral for the normal functioning of the body. However, they have a darker side; according to several studies, they are associated with various cancers. The medical community has fathoms to go before truly understanding the implications of different serum lipid levels in cancer.
As a major step in this direction, a group of scientists from the Key Laboratory of Carcinogenesis and Translational Research, Laboratory of Genetics, Peking University Cancer Hospital and Institute; Hua County People's Hospital; and Anyang Cancer Hospital, have successfully determined that a family history ...
(BOSTON) - Research collaborators from the VA, Boston University, and the Concussion Legacy Foundation (CLF) published an inspiring new report today, "1,000 Reasons for Hope," which exclusively details the first 1,000 brain donors studied at the VA-BU-CLF Brain Bank since 2008 and how they have advanced research on concussions and CTE. The report also explains how the next 1,000 brain donors will answer critical questions that take us closer to preventing, diagnosing, and treating CTE, as well as the long-term consequences of concussion and traumatic brain injury.
"Our understanding ...
LAST 30 PRESS RELEASES:
[Press-News.org] Physicists made photons be friends with magnons