Forum für Wissenschaft, Industrie und Wirtschaft

Hauptsponsoren:     3M 
Datenbankrecherche:

 

Engineers Show Feasibility of Superfast Materials for Computing

15.02.2013
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.

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.


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.

“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.

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
Contacts:
-- Feng Liu, professor and chair of materials science and engineering –
cell 801-815-7659, office 801-587-7719, fliu@eng.utah.edu
-- Aditi Risbud, senior communications and marketing officer, College of Engineering – cell 213-400-5815, office 801-587-9038, aditi.risbud@coe.utah.edu

Aditi Risbud | Newswise
Further information:
http://www.utah.edu
http://www.coe.utah.edu

More articles from Materials Sciences:

nachricht Strength and ductility for alloys
27.05.2016 | Max-Planck-Institut für Eisenforschung GmbH

nachricht Computational high-throughput screening finds hard magnets containing less rare earth elements
25.05.2016 | Fraunhofer-Institut für Werkstoffmechanik IWM

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Tiroler Technologie zur Abwasserreinigung weltweit erfolgreich

Auf biologischem Weg und mit geringem Energieeinsatz wandelt ein an der Universität Innsbruck entwickeltes Verfahren in Kläranlagen anfallende Stickstoffverbindungen in unschädlichen Luftstickstoff um. Diese innovative Technologie wurde nun gemeinsam mit dem US-Wasserdienstleister DC Water weiterentwickelt und vermarktet. Für die Kläranlage von Washington DC wird die bisher größte DEMON®-Anlage errichtet.

Das DEMON®-Verfahren wurde bereits vor elf Jahren entwickelt und von der Universität Innsbruck zum Patent angemeldet. Inzwischen wird die Technologie in rund...

Im Focus: Worldwide Success of Tyrolean Wastewater Treatment Technology

A biological and energy-efficient process, developed and patented by the University of Innsbruck, converts nitrogen compounds in wastewater treatment facilities into harmless atmospheric nitrogen gas. This innovative technology is now being refined and marketed jointly with the United States’ DC Water and Sewer Authority (DC Water). The largest DEMON®-system in a wastewater treatment plant is currently being built in Washington, DC.

The DEMON®-system was developed and patented by the University of Innsbruck 11 years ago. Today this successful technology has been implemented in about 70...

Im Focus: Optische Uhren können die Sekunde machen

Eine Neudefinition der Einheit Sekunde auf der Basis von optischen Uhren wird realistisch

Genauer sind sie jetzt schon, aber noch nicht so zuverlässig. Daher haben optische Uhren, die schon einige Jahre lang als die Uhren der Zukunft gelten, die...

Im Focus: Computational High-Throughput-Screening findet neue Hartmagnete die weniger Seltene Erden enthalten

Für Zukunftstechnologien wie Elektromobilität und erneuerbare Energien ist der Einsatz von starken Dauermagneten von großer Bedeutung. Für deren Herstellung werden Seltene Erden benötigt. Dem Fraunhofer-Institut für Werkstoffmechanik IWM in Freiburg ist es nun gelungen, mit einem selbst entwickelten Simulationsverfahren auf Basis eines High-Throughput-Screening (HTS) vielversprechende Materialansätze für neue Dauermagnete zu identifizieren. Das Team verbesserte damit die magnetischen Eigenschaften und ersetzte gleichzeitig Seltene Erden durch Elemente, die weniger teuer und zuverlässig verfügbar sind. Die Ergebnisse wurden im Online-Fachmagazin »Scientific Reports« publiziert.

Ausgangspunkt des Projekts der IWM-Forscher Wolfgang Körner, Georg Krugel und Christian Elsässer war eine Neodym-Eisen-Stickstoff-Verbindung, die auf einem...

Im Focus: University of Queensland: In weniger als 2 Stunden ans andere Ende der Welt reisen

Ein internationales Forschungsteam, darunter Wissenschaftler der University of Queensland, hat im Süden Australiens einen erfolgreichen Hyperschallgeschwindigkeitstestflug absolviert und damit futuristische Reisemöglichkeiten greifbarer gemacht.

Flugreisen von London nach Sydney in unter zwei Stunden werden, dank des HiFiRE Programms, immer realistischer. Im Rahmen dieses Projekts werden in den...

Alle Focus-News des Innovations-reports >>>

Anzeige

Anzeige

IHR
JOB & KARRIERE
SERVICE
im innovations-report
in Kooperation mit academics
Veranstaltungen

Wie sieht die Schifffahrt der Zukunft aus? - IAME-Jahreskonferenz in Hamburg

27.05.2016 | Veranstaltungen

Technologische Potenziale der Multiparameteranalytik

27.05.2016 | Veranstaltungen

Umweltbeobachtung in nah und fern

27.05.2016 | Veranstaltungen

 
B2B-VideoLinks
Weitere VideoLinks >>>
Aktuelle Beiträge

Stressoren erkennen, Belastungen reduzieren, Fachwissen erlangen

27.05.2016 | Seminare Workshops

HDT SOMMERAKADEMIE 2016

27.05.2016 | Seminare Workshops

11 Millionen Euro für die Erforschung von Magnetfeldsensoren für die medizinische Diagnostik

27.05.2016 | Förderungen Preise