It's the first time the intrinsic properties of a semiconductor—not external electric or magnetic fields–have been used to achieve the effect. The findings, published this week in Nature, could have implications for the development of so called 'spintronic' circuits: systems that use the directional spin of electrons to store and process data.
"The need to use high-frequency external fields to control spin is one of the major stumbling blocks in using electrons for information processing, or in a spintronic circuit," notes Joshua Folk, principal investigator on the project and Canada Research Chair in the Physics of Nanostructures. "We show that the spin of electrons can be controlled without external fields, simply by designing the right circuit geometry and letting electrons move freely through it."
The new technique uses the natural interactions of the electrons within the semiconductor micro-channel to control their spin--a technique that is a major step, but not yet flexible enough for industrial applications, notes Folk, an Assistant Professor with Physics and Astronomy who came to UBC via the Massachusetts Institute of Technology.
Electronic systems that use the spin of an electron--a quantum mechanical property that comes in two varieties: up or down--would work similarly to today's transistors, but be smaller and use less energy.
Presently, electrical charge alone is responsible for the logic functions in circuits. Power consumption by these circuits is the primary roadblock to faster, more powerful processors. A spintronic circuit has the potential to use less power by storing and manipulating a bit of information as electron spin.
Spintronic circuits may also be a viable avenue for building quantum information processing devices. The exponentially faster processing possible with such a device could have applications ranging from code breaking, to dramatically improved drug design, to simulations of complex processes in molecular systems.
Next steps by Folk and his team—working with colleagues at the Universität Regensburg in Germany—will include using new devices to gain more precise control over the alignment and trajectory of the electrons.
Laser sensor LAH-G1 - optical distance sensors with measurement value display
15.08.2017 | WayCon Positionsmesstechnik GmbH
Engineers find better way to detect nanoparticles
14.08.2017 | Washington University in St. Louis
Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...
Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...
For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...
An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...
A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
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