Electrons have an intrinsic angular momentum, called spin. As a consequence, not only do they carry charge, but they also behave like tiny magnets, which can be aligned. In our everyday use of computers, however, so many electron magnets point randomly in all directions as to cancel out as a whole.
The edge currents of a topological insulator serve as a source of spin-polarized electrons. Graphics: Luis Maier
Electron microscopic image of the circuit: The semiconductor H is shown in red, the gate contacts in yellow. The picture shows a section of about three by three micrometers. Photo: Luis Maier
But if the spin were to be controlled, conventional computers might suddenly become a lot faster: In the field of so-called spintronics, the magnetic orientation of the electrons is used for information transfer, which generates much less heat than is produced by continually switching the current on and off as is required in conventional electronics.Metal and insulator at the same time: Topological insulators
Robert Emmerich | idw
Abrupt motion sharpens x-ray pulses
28.07.2017 | Max-Planck-Institut für Kernphysik
Physicists Design Ultrafocused Pulses
27.07.2017 | Universität Innsbruck
Spectrally narrow x-ray pulses may be “sharpened” by purely mechanical means. This sounds surprisingly, but a team of theoretical and experimental physicists developed and realized such a method. It is based on fast motions, precisely synchronized with the pulses, of a target interacting with the x-ray light. Thereby, photons are redistributed within the x-ray pulse to the desired spectral region.
A team of theoretical physicists from the MPI for Nuclear Physics (MPIK) in Heidelberg has developed a novel method to intensify the spectrally broad x-ray...
Physicists working with researcher Oriol Romero-Isart devised a new simple scheme to theoretically generate arbitrarily short and focused electromagnetic fields. This new tool could be used for precise sensing and in microscopy.
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Fraunhofer IPA has developed a proximity sensor made from silicone and carbon nanotubes (CNT) which detects objects and determines their position. The materials and printing process used mean that the sensor is extremely flexible, economical and can be used for large surfaces. Industry and research partners can use and further develop this innovation straight away.
At first glance, the proximity sensor appears to be nothing special: a thin, elastic layer of silicone onto which black square surfaces are printed, but these...
3-D shape acquisition using water displacement as the shape sensor for the reconstruction of complex objects
A global team of computer scientists and engineers have developed an innovative technique that more completely reconstructs challenging 3D objects. An ancient...
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