by Staff Writers
Basel, Switzerland (SPX) Jul 21, 2017
Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel's Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.
For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled to its motion, i.e. its orbit within the chip. This spin-orbit coupling allows targeted manipulation of the electron spin by an external electric field, but it also causes the spin's orientation to decay, which leads to a loss of information.
In an international collaboration with colleagues from the US and Brazil, scientists from the University of Basel's Department of Physics and the Swiss Nanoscience Institute, headed by Professor Dominik Zumbuhl, have developed a new method that allows for targeted spin manipulation without the accompanying decay.
Controlling spins over long distances
The Rashba and Dresselhaus fields predominantly determine the helical movement of the spin. In the experiment described above, the Dresselhaus and Rashba fields can be kept at the same level, while the overall strength of the two fields can simultaneously be controlled: in this way, the spin's decay can be suppressed.
This allows the researchers to use voltages to adjust the spin's orientation over distances greater than 20 micrometers, which is a particularly large distance on a chip and corresponds to many spin rotations. Spin information can thus be transmitted e.g. between different quantum bits.
Adjusting the fields with electrical voltages
Although this was predicted more than 20 years ago in a theoretical study, it has only now been possible to demonstrate it thanks to a newly-developed measurement method based on quantum interference effects at low temperatures near absolute zero. It is expected, however, that the helix will also be able to be controlled with voltages at higher temperatures and even at room temperature.
Basis for further developments
The outstanding collaboration with colleagues from the University of Sao Paulo, the University of California and the University of Chicago provides the basis for a whole new generation of devices that build on spin-based electronics and create prospects for further experimental work.
Fukuoka, Japan (SPX) Jul 14, 2017
Renewed investigation of a molecule that was originally synthesized with the goal of creating a unique light-absorbing pigment has led to the establishment of a novel design strategy for efficient light-emitting molecules with applications in next-generation displays and lighting. Researchers at Kyushu University's Center for Organic Photonics and Electronics Research (OPERA) demonstrated ... read more
University of Basel
Computer Chip Architecture, Technology and Manufacture
Nano Technology News From SpaceMart.com
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement|