A research group led by Dr. Takashi Uchihashi, a MANA Scientist, and Dr. Tomonobu Nakayama, a MANA Principal Investigator, both of the International Center for Materials Nanoarchitectonics (MANA; Director-General: Masakazu Aono), National Institute for Materials Science (President: Sukekatsu Ushioda), demonstrated that a substance comprising a metal single atomic layer on a silicon surface becomes free of electrical resistance by superconductivity.
The current mainstream integrated circuits using semiconductor devices generate excessive heat during operation, and this is a serious problem from the viewpoints of energy saving and environmental protection. Logic elements using superconductors have attracted attention as an effective candidate which offers a fundamental solution to this problem. On the other hand, research on quantum information communication using single photon detectors employing superconducting devices is also progressing as a means of communication which assures perfect information security. As issues for future practical application, it is necessary to realize high integration and high efficiency, etc. in these respective devices. Refinement and creation of thin films of superconducting materials are considered effective for this purpose.
Focusing on an indium single atomic layer arranged with a special structure on a silicon surface, the team led by Dr. Uchihashi observed for the first time in the world that the electrical resistance of this substance become zero, and the substance displays superconductivity, when cooled to a low temperature. Furthermore, when the current passing through this substance was increased, it was possible to pass a large current of 6.1ã109 A/m2 (current density) at maximum. Based on the principle of superconductivity, it had been anticipated that a superconducting current (=current with zero resistance) would be difficult to pass through the extremely confined and disordered region at the surface of a solid. However, this research overturned that prospect.
This research clarified the fact that the thickness of superconducting materials can be reduced to the ultimate limit of the atomic level. It is considered that this achievement will accelerate research on further refinement/integration of superconducting logic elements and research on higher efficiency/higher speed in superconducting detectors.
These research results are scheduled for publication in the near future as an Editorfs Suggestion in the journal of the American Institute of Physics, Physical Review Letters.
Gelatine instead of forearm
19.04.2017 | Empa - Eidgenössische Materialprüfungs- und Forschungsanstalt
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18.04.2017 | Duke University
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
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Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
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Two researchers at Heidelberg University have developed a model system that enables a better understanding of the processes in a quantum-physical experiment...
Glaciers might seem rather inhospitable environments. However, they are home to a diverse and vibrant microbial community. It’s becoming increasingly clear that they play a bigger role in the carbon cycle than previously thought.
A new study, now published in the journal Nature Geoscience, shows how microbial communities in melting glaciers contribute to the Earth’s carbon cycle, a...
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21.04.2017 | Physics and Astronomy