Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Engineers show feasibility of superfast materials: 'Organic topological insulators' for quantum computing

University of Utah engineers demonstrated it is feasible to build the first organic materials that conduct electricity on their molecular edges, but act as an insulator inside. Called organic topological insulators, these materials are made from a thin molecular sheet (left) that resembles chicken wire and conducts electricity on its right edge (blue line) -- with the electrons carrying more information in the form of "up" spin. These new materials could be used to shuttle information at the speed of light in quantum computers due to the unique physical behavior a special class of electrons called Dirac fermions, depicted (right) in a plot of their energy and momentum.

Credit: Zhengfei Wang and Feng Liu, University of Utah
University of Utah engineers demonstrated it is feasible to build the first organic materials that conduct electricity on their molecular edges, but act as an insulator inside. Called organic topological insulators, these materials are made from a thin molecular sheet (left) that resembles chicken wire and conducts electricity on its right edge (blue line) -- with the electrons carrying more information in the form of "up" spin. These new materials could be used to shuttle information at the speed of light in quantum computers due to the unique physical behavior a special class of electrons called Dirac fermions, depicted (right) in a plot of their energy and momentum.

Credit: Zhengfei Wang and Feng Liu, University of Utah

Abstract:
University of Utah engineers demonstrated it is feasible to build the first organic materials that conduct electricity on their edges, but act as an insulator inside. These materials, called organic topological insulators, could shuttle information at the speed of light in quantum computers and other high-speed electronic devices.

Engineers show feasibility of superfast materials: 'Organic topological insulators' for quantum computing

Salt Lake City, UT | Posted on February 14th, 2013

The study published this week in the journal Nature Communications will help pioneer a new field of research in materials science, in the same way organic materials lowered the cost and eased production of light-emitting diodes and solar cells, says senior author Feng Liu, professor and chair of materials science and engineering.

"This is the first demonstration of the existence of topological insulators based on organic materials," says Liu. "Our findings will broaden the scope and impact of these materials in various applications from spintronics to quantum computing."

While other researchers still must synthesize the new organic topological insulators, Liu says his team's previous work "shows we can engineer an interface between two different thin films to create topological insulators," in which electrons known as Dirac fermions move along the interface between two films, Liu adds.

Liu and his co-workers at the University of Utah's College of Engineering performed theoretical calculations to predict the existence of an organic topological insulator using molecules with carbon-carbon bonds and carbon-metal bonds, called an organometallic compound. For this new study, the team investigated how Dirac fermions move along the edges of this compound, which looks like a sheet of chicken wire.

To generate a topological insulator, scientists have to design materials that can transmit fermions. In a topological insulator, fermions behave like a massless or weightless packet of light, conducting electricity as they move very fast along a material's surface or edges. When these fermions venture inside the material, however, this "weightless" conductivity screeches to a halt.

What's more, Dirac fermions have a property called spin, or angular momentum around the particle's axis that behaves like a magnetic pole. This property gives scientists another way to place information into a particle because the spin can be switched "up" or "down." Such a mechanism could be useful for spin-based electronic devices, called spintronics, which can store information both in the charge and the spin of electrons.

"We have demonstrated a system with a special type of electron - a Dirac fermion - in which the spin motion can be manipulated to transmit information," Liu says. "This is advantageous over traditional electronics because it's faster and you don't have to worry about heat dissipation."

Earlier this year, Liu and his team discovered a "reversible" topological insulator in a system of bismuth-based compounds in which the behavior of ordinary or Dirac fermions could be controlled at the interface between two thin films. Bismuth is a metal best known as an ingredient of Pepto-Bismol. These theoretical predictions were confirmed experimentally by co-authors from Shanghai Jiaotong University in China.

Although inorganic topological insulators based on different materials have been studied for the last decade, organic or molecular topological insulators have not.

Liu conducted the study with Zhengfei Wang and Zheng Liu, both postdoctoral fellows in materials science and engineering at the University of Utah. The study was funded primarily by the U.S. Department of Energy, with additional support from the Army Research Laboratory and from the National Science Foundation through the University of Utah's Materials Research Science and Engineering Center.

####

For more information, please click here

Contacts:
Aditi Risbud

801-587-9038

University of Utah College of Engineering
72 S. Central Campus Dr., Room 1650 WEB
Salt Lake City, UT 84112
801-581-6911
fax: 801-581-8692
www.coe.utah.edu

Copyright © University of Utah

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

The laser pulse that gets shorter all by itself: Ultrashort laser pulses have become an indispensable tool for atomic and molecular research; A new technology makes creating short infrared pulses easy and cheap January 27th, 2015

New pathway to valleytronics January 27th, 2015

Stomach acid-powered micromotors get their first test in a living animal January 27th, 2015

Entanglement on a chip: Breakthrough promises secure communications and faster computers January 27th, 2015

Govt.-Legislation/Regulation/Funding/Policy

New pathway to valleytronics January 27th, 2015

Nanoshuttle wear and tear: It's the mileage, not the age January 26th, 2015

Visualizing interacting electrons in a molecule: Scientists at Aalto University and the University of Zurich have succeeded in directly imaging how electrons interact within a single molecule January 26th, 2015

The latest fashion: Graphene edges can be tailor-made: Rice University theory shows it should be possible to tune material's properties January 24th, 2015

Spintronics

Piezoelectricity in a 2-D semiconductor: Berkeley Lab researchers discovery of piezoelectricty in molybdenum disulfide holds promise for future MEMS December 22nd, 2014

Switching to spintronics: Berkeley Lab reports on electric field switching of ferromagnetism at room temp December 17th, 2014

Pb islands in a sea of graphene magnetise the material of the future December 16th, 2014

'Giant' charge density disturbances discovered in nanomaterials: Juelich researchers amplify Friedel oscillations in thin metallic films November 26th, 2014

Chip Technology

New pathway to valleytronics January 27th, 2015

Entanglement on a chip: Breakthrough promises secure communications and faster computers January 27th, 2015

Electronic circuits with reconfigurable pathways closer to reality January 26th, 2015

The latest fashion: Graphene edges can be tailor-made: Rice University theory shows it should be possible to tune material's properties January 24th, 2015

Quantum Computing

New pathway to valleytronics January 27th, 2015

Entanglement on a chip: Breakthrough promises secure communications and faster computers January 27th, 2015

Graphene brings quantum effects to electronic circuits January 22nd, 2015

Improved interface for a quantum internet January 16th, 2015

Discoveries

The laser pulse that gets shorter all by itself: Ultrashort laser pulses have become an indispensable tool for atomic and molecular research; A new technology makes creating short infrared pulses easy and cheap January 27th, 2015

New pathway to valleytronics January 27th, 2015

Stomach acid-powered micromotors get their first test in a living animal January 27th, 2015

Entanglement on a chip: Breakthrough promises secure communications and faster computers January 27th, 2015

Announcements

The laser pulse that gets shorter all by itself: Ultrashort laser pulses have become an indispensable tool for atomic and molecular research; A new technology makes creating short infrared pulses easy and cheap January 27th, 2015

New pathway to valleytronics January 27th, 2015

Entanglement on a chip: Breakthrough promises secure communications and faster computers January 27th, 2015

Engineering self-assembling amyloid fibers January 26th, 2015

Military

Detection of Heavy Metals in Samples with Naked Eye January 26th, 2015

The latest fashion: Graphene edges can be tailor-made: Rice University theory shows it should be possible to tune material's properties January 24th, 2015

Scientists 'bend' elastic waves with new metamaterials that could have commercial applications: Materials could benefit imaging and military enhancements such as elastic cloaking January 23rd, 2015

Laser-generated surface structures create extremely water-repellent metals: Super-hydrophobic properties could lead to applications in solar panels, sanitation and as rust-free metals January 20th, 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







© Copyright 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE