Notifications on selected papers
Here we provide an overview of selected papers by Jülich scientists that have been published in journals. These notifications comprise a brief summary as well as data regarding the publication. An RSS Newsfeed has also been created for the notifications.
Search results 1 to 7 from a total of 15
Date |
Content |
Originalpublikation |
|---|---|---|
| 09 May 2017 | Shape determines properties
Jülich, 10 May 2017 – A team of researchers from Jülich and Potsdam has for the first time produced monodisperse mesocrystals, which behave magnetically like single crystals, from a magnetic material known as magnetite. "Monodisperse" means that the particles created are all of the same size; in this example, 40 nanometres. Mesocrystals are crystals made up of nanocrystals, in this case of superparamagnetic magnetite. The particles can now be used as a model system to improve the fields of application of magnetite particles.
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Single crystalline superstructured stable single domain magnetite nanoparticles |
| 27 Apr 2017 | Smaller Particles Not Always Faster
Jülich, 27 April 2017 – The smaller the object, the faster it disperses in its environment: take for example fine grains of sand and rough gravel in the river, or small crumbs and a loaf of bread on the kitchen table. The same behaviour can be seen with microscopically small particles which – excited by surrounding molecules – are distributed through space in the course of time. In 1905, Albert Einstein was able to provide evidence demonstrating that the speed of this Brownian motion is inversely proportional to the radius of a particle, that is to say its size. Scientists from Forschungszentrum Jülich, KU Leuven, and the CRPP research centre in Bordeaux have now discovered an exception to this rule. For their experiments, they used a lamellar system in which the large particles are more mobile than the small ones.
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Fast Diffusion of Long Guest Rods in a Lamellar Phase of Short Host Particles |
| 12 Apr 2017 | Synchronization Effects in the Quantum World
Jülich, 12 March 2017 – A German–Italian team of researchers headed by the Jülich physicist Dirk Witthaut was able to verify a direct link between classical synchronization and quantum entanglement. The scientists examined a certain type of coupled quantum systems which can be implemented in experiments using Bose–Einstein condensates. They combined the classical theory of synchronization with simulations of quantum dynamics – and were able to show that classical synchronization predicts the development of entangled quantum states.
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Classical synchronization indicates persistent entanglement in isolated quantum systems, Dirk Witthaut, Sandro Wimberger, Raffaella Burioni, Marc Timme |
| 10 Apr 2017 | A New View on the Origin of Magnetism
Jülich, 10 April 2017 – How does a ferromagnet behave during the transition to a paramagnetic state? The answer to this question is decisive for understanding the quantum-mechanical origins of magnetism – and may even point to a way to achieve faster data storage. With the aid of a novel measuring technique, a team of German and American researchers has succeeded in finding a new answer to this question.
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Band structure evolution during the ultrafast ferromagnetic-paramagnetic phase transition in cobalt, by Steffen Eich, Moritz Plötzing, Markus Rollinger, Sebastian Emmerich, Roman Adam, Cong Chen, Henry Cornelius Kapteyn, Margaret M. Murnane, Lukasz Plucinski, Daniel Steil, Benjamin Stadtmüller, Mirko Cinchetti, Martin Aeschlimann, Claus M. Schneider, Stefan Mathias, Science Advances, DOI: 10.1126/sciadv.1602094 |
| 20 Mar 2017 | Quantum Computers: New Basis Discovered for Stable Quantum Bits with Exotic Majorana Particles
Jülich, 21 March 2017 – Majorana particles are considered to be promising candidates for stable quantum bits. Their realization is one of the biggest challenges in the development of quantum computers. Almost 80 years ago, the Italian physicist Ettore Majorana predicted particles which are simultaneously their own antiparticles. However, only in the past few years has it been possible to experimentally approximate the existence of such Majoranas. Scientists from Forschungszentrum Jülich have now successfully performed an experiment which represents an important step towards creating Majoranas so that they can also be used for processing and storing quantum information. In collaboration with scientists from the universities of Würzburg and Duisburg-Essen, they found evidence in semiconductor nanowires for a new kind of coupling mechanism and extremely strong spin-orbit coupling. The latter is considered to be an important prerequisite for creating quantum bits in nanowires with the aid of these exotic particles.
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Signatures of interaction-induced helical gaps in nanowire quantum point contacts |
| 10 Jan 2017 | New Hybrid Material for Future Spin Transistors
Jülich, 10 January 2017 – Spin-based transistors may replace conventional transistors in future since they require considerably less energy, however their industrial implementation has so far been hampered due to the lack of a suitable material. Early-career researcher Zeila Zanolli has now discovered a novel combination of graphene and barium manganese oxide which satisfies the conflicting requirements. Simulations conducted on the supercomputers at the Jülich Supercomputing Centre (JSC) have shown that the new hybrid material permits both precise spin orientation and good spin transport.
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Graphene-multiferroic interfaces for spintronics applications |
| 20 Dec 2016 | Characterization of Magnetic Nanovortices Simplified
Jülich, 20 December 2016 - Magnetic nanovortices, so-called “skyrmions”, count among the most promising candidates for the future of information technology. Processors and storage media making use of these tiny structures could one day lead to the further miniaturization of IT devices and improve their energy efficiency significantly. Materials possessing suitable vortices can be identified in particular by their topological charge, an essential characteristic of skyrmions. To determine this property experimentally has up to now been a very laborious process. Physicists from Jülich have now put forward a simpler method which could speed up the screening of suitable materials, using X-rays.
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Chirality-driven orbital magnetic moments as a new probe for topological magnetic structures; |
