Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > RUB Physicists get into a SPIN again

Torkeln der Elektronenspins
 
The diagrams show how the spin wavers (oscillation shown at top) in relation to time following an alignment laser pulse. One oscillation period corresponds to one complete waver rotation. As anticipated, the strength (amplitude) of all red curves decreases with time. After 1.2 nanoseconds (ns) a laser control pulse is irradiated to suddenly change the alignment of the spin, indicated by the phase of blue and finally green curves: It is precisely the counter-phase to the black curve at the bottom, recorded without control pulse. Moreover this waver builds up in the counter-phase at 2.4 ns, so that the signal is particularly high here, significantly facilitating readout.
Torkeln der Elektronenspins

The diagrams show how the spin wavers (oscillation shown at top) in relation to time following an alignment laser pulse. One oscillation period corresponds to one complete waver rotation. As anticipated, the strength (amplitude) of all red curves decreases with time. After 1.2 nanoseconds (ns) a laser control pulse is irradiated to suddenly change the alignment of the spin, indicated by the phase of blue and finally green curves: It is precisely the counter-phase to the black curve at the bottom, recorded without control pulse. Moreover this waver builds up in the counter-phase at 2.4 ns, so that the signal is particularly high here, significantly facilitating readout.

Abstract:
The intrinsic rotation of electrons - the "spin" - remains unused by modern electronics. If use as an information carrier were possible, the processing power of electronic components would suddenly increase to a multiple of the present capacity. In cooperation with colleagues from Dortmund, St. Petersburg and Washington, Bochum physicists have now succeeded in aligning electron spin, bringing it to a controlled "waver" and reading it out.

RUB Physicists get into a SPIN again

Bochum, Germany | Posted on March 30th, 2009

The electron spin can also be realigned as required at any time using optical pulses. "This is the first, important step toward addressing these "quantum bits", which will form an integral part of data transfer systems and processors in the future", exclaimed Prof. Andreas Wieck. The researchers have published their report in NATURE Physics.

Complex Calculations in Minimum Space

The entirety of present day electronics is based on electrical charges: If a memory cell (bit) has an electrical charge, it represents a logical "1", if no charge is present this is a logical "0". However electrons have more than just a charge - they spin like a top around their own axis, producing a magnetic field, similar to the earth. This spin can be accelerated or decelerated by applying an external magnetic field. The "top" begins to waver and its axis tips to virtually any desired angle. If these manifold possibilities were used as information carriers, it would be possible to store a great deal more information than just "0" and "1" with an electron. Moreover adjacent electrons could be moved into various configurations, because they exert forces on one another in the same manner as two magnets on a bulletin board. This phenomenon would provide a significantly more complex base for data storage and processing. Even a small quantity of these so-call quantum bits (qubits), would allow extremely complex calculations, for which millions of bits are required today.

Confinement of Spins in Indium-Arsenic Islands

Naturally one single electron has only a very small measureable effect. For this reason individual electron measurements can only be performed with great difficulty using highly sensitive instruments. This is why the international research team has specialized in confining nearly one million electrons each in virtually identical indium-arsenic islands ("quantum dots") and totaling their effect. These "ensemble" measurements provide signals which are stronger by a magnitude of six, making them very sturdy and allowing them to be recorded easily. "Contrary to the preconceptions of many international competitors, all associated electron spins exhibit precisely the same behavior and the microscopic effects can therefore be measured very easily" stated Wieck.

Optical Switching of Quantum Dots

In the study published in "NATURE" the physicists were not only successful in aligning the electron spin; they also managed to rotate it optically using a laser pulse in any desired direction at any time and read this direction out with a further laser pulse. This is the first important step towards "addressing" and influencing qubits. "The interesting factor here is that these electrons are enclosed in solid bodies, so we no longer need complex high vacuum equipment and light occlusion on all sides to keep them permanently in a module as in quantum optics " stressed Prof. Wieck. In Bochum the extremely high vacuum is required only once during production of the quantum dot; after that the semiconductor system is sealed against air ingress, has a long service life and is just as reliable as all transistors and memory cells already in use today.

####

About Ruhr University in Bochum
From local best to international research excellence: The Ruhr-Universität Bochum (RUB) has character and charm; and its people make the campus a living and unique place. Discover a university with a profile, with interesting people, a one-off campus, and impressive numbers and facts.

Contacts:
Prof. Dr. Andreas Wieck
Chair for Applied Solid State Physics at the Ruhr University in Bochum
Tel.: 0234/32-28786

Copyright © Ruhr University in Bochum

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Nanofiltration Membrane Market 2015 - Global Industry Survey, Analysis, Size, Share, Outlook and Forecast to 2020 July 31st, 2015

Nanozirconia Market 2015 - Global Industry Survey, Analysis, Size, Share, Outlook and Forecast to 2020 July 31st, 2015

Self-Healing Nano Anti-rust Coatings Market 2015 - Global Industry Survey, Analysis, Size, Share, Outlook and Forecast to 2020 July 31st, 2015

Nano Spray Instrument Market 2015 - Global Industry Survey, Analysis, Size, Share, Outlook and Forecast to 2020 July 31st, 2015

Possible Futures

Nanofiltration Membrane Market 2015 - Global Industry Survey, Analysis, Size, Share, Outlook and Forecast to 2020 July 31st, 2015

Nanozirconia Market 2015 - Global Industry Survey, Analysis, Size, Share, Outlook and Forecast to 2020 July 31st, 2015

Self-Healing Nano Anti-rust Coatings Market 2015 - Global Industry Survey, Analysis, Size, Share, Outlook and Forecast to 2020 July 31st, 2015

Nano Spray Instrument Market 2015 - Global Industry Survey, Analysis, Size, Share, Outlook and Forecast to 2020 July 31st, 2015

Spintronics

Spintronics: Molecules stabilizing magnetism: Organic molecules fixing the magnetic orientation of a cobalt surface/ building block for a compact and low-cost storage technology/ publication in Nature Materials July 25th, 2015

Penn researchers discover new chiral property of silicon, with photonic applications July 25th, 2015

Spintronics just got faster July 20th, 2015

Fundamental observation of spin-controlled electrical conduction in metals: Ultrafast terahertz spectroscopy yields direct insight into the building block of modern magnetic memories July 6th, 2015

Quantum Computing

Quantum networks: Back and forth are not equal distances! July 28th, 2015

The quantum middle man July 2nd, 2015

Freezing single atoms to absolute zero with microwaves brings quantum technology closer: Atoms frozen to absolute zero using microwaves July 2nd, 2015

Producing spin-entangled electrons July 2nd, 2015

Nanoelectronics

Superfast fluorescence sets new speed record: Plasmonic device has speed and efficiency to serve optical computers July 27th, 2015

Spintronics: Molecules stabilizing magnetism: Organic molecules fixing the magnetic orientation of a cobalt surface/ building block for a compact and low-cost storage technology/ publication in Nature Materials July 25th, 2015

ORNL researchers make scalable arrays of 'building blocks' for ultrathin electronics July 22nd, 2015

An easy, scalable and direct method for synthesizing graphene in silicon microelectronics: Korean researchers grow 4-inch diameter, high-quality, multi-layer graphene on desired silicon substrates, an important step for harnessing graphene in commercial silicon microelectronics July 21st, 2015

Quantum nanoscience

Theoretical Physicists at Freie Universität Berlin Develop New Insights into Interface between Classical and Quantum Worlds July 31st, 2015

Detecting small metallic contaminants in food via magnetization: A practical metallic-contaminant detecting system using three high-Tc RF superconducting quantum interference devices (SQUIDs) July 29th, 2015

Drawing a line between quantum and classical world: Bell's Inequality fails as a test of the boundary July 21st, 2015

World first: Significant development in the understanding of macroscopic quantum behavior: Researchers from Polytechnique Montréal and Imperial College London demonstrate the wavelike quantum behavior of a polariton condensate on a macroscopic scale and at room temperature July 14th, 2015

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project