Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Honeycomb Nets from Bismuth Cubes: A New Prospect for Nanoelectronics

Abstract:
Researchers from Dresden discover a new material that conducts electric currents without loss of power over its edges and remains an insulator in its interior. The material is made out of bismuth cubes packed in a honeycomb motif that is known from the graphene structure. As opposed to graphene, the new material exhibits its peculiar electrical property also at room temperature and, hence, holds big promises for applications in nanoelectronics.

Honeycomb Nets from Bismuth Cubes: A New Prospect for Nanoelectronics

Dresden, Germany | Posted on March 19th, 2013

Researchers from the TU Dresden and the Leibniz Institute for Solid State and Materials Research, both in Dresden, have synthesized a new material that on the atomic level resembles graphene, a honeycomb net from carbon atoms. The new material is built mainly by atoms of the heavy element bismuth. Whereas a honeycomb-like sheet is formed by carbon atoms in graphene, the honeycomb net in the new material is assembled from bismuth cubes The researchers in Dresden are particularly excited about their discovery because the electrons inside their bismuth-based material form a new and exotic quantum state of matter. The joint paper by the groups of Prof. Michael Ruck from the Institute of Inorganic Chemistry, TU Dresden, and Prof. Jeroen van den Brink, IFW Dresden, recently published in Nature Materials, reports that the new material is made out of sheets of a so-called topological insulator, which has the property that electric currents can flow on its edges without loss of power.

What is a topological insulator? Traditionally materials are classified according to their conducting properties as either electrical conductors or insulators. Within this classification semiconductors are considered to be a special type of insulator. Topological insulators are described by physicists as a third state of matter the interior of which is perfectly insulating, while its outside surface and/or edges are conducting. Noteworthy is that the electric currents on the conducting surface and/or edges of a topological insulator can run unimpeded. This characteristic gives topologically insulating materials great potential for use in future microelectronic transistors and sensors that are highly energy efficient.

„Graphene was the first material predicted to be a topological insulator, but such an exotic state could only exist at extremely low temperatures, very close to the absolute zero of temperature", explains Professor Ruck the motivation behind the search for a suitable material. „The structure and topological properties of the discovered new material from bismuth cubes are related to those of graphene. However, our material has the remarkable advantage of being a topological insulator at room temperature."

Each electron carries besides an electrical charge also a magnetic moment, the spin of the electron. In a normal metal, such as copper, the electron spins point in an arbitrary direction. But electrons traveling in the same direction along the metallic edges of the bismuth cubes in the new material are very different in this respect: They spontaneously align their spins. This effect is due to the exotic quantum nature of the topological insulator. What is more, when these electrons change their direction of motion along the edge, their spins are also collectively reversed. Hence electrons that travel along the edge in opposite directions also have opposite spin orientations.

The spin-alignment of electrons that carry an electric current is an appealing feature for spintronics, an emerging information-processing technology that relies on the control of the intrinsic spin of electrons to build efficient computing and memory devices.

Both Michael Ruck and Jeroen van den Brink stand proud of the results of their close cooperation. „The excellent research environment and the strong scientific partnership in Dresden were essential for success", emphasizes Professor Jeroen van den Brink, a director of the Institute for Theoretical Solid State Physics at the Leibniz Institute Dresden.

Original publication:
Nature Materials, „Stacked topological insulator built from bismuth-based graphene sheet analogues",
DOI: 10.1038/NMAT3570

####

About TU Dresden
The TU Dresden is among the top universities in Germany and Europe: strong in research, offering first-rate programmes of an overwhelming diversity, with close ties to culture, industry and society. As a modern full-status university with 14 departments, it offers a wide academic range making it one of a very few in Germany. TU Dresden is the largest university in Saxony. The big campus family of TU Dresden are 37.000 students, ca. 5.300 publicly funded staff members – among them 507 professors – and approximately 3.400 externally funded staff members.

On the 15th of June 2012 TU Dresden has succeeded in the Initiative for Excellence by the Federal Government in all funding lines with all its proposals. The institutional strategy "The Synergetic University", both proposals for clusters of excellence "Center for Advancing Electronics Dresden" (cfaed) and “Center for Regenerative Therapies Dresden” (CRTD) as well as the Dresden International Graduate School for Biomedicine and Bioengineering (DIGS-BB) were approved. Now TUD is one of the eleven German universities that were identified as a “university of excellence”.

About the Leibniz Institute Dresden (IFW)

The Leibniz Institute for Solid State and Materials Research in Dresden – in short IFW Dresden – is a non-university research institute and a member of the G. W. Leibniz Scientific Community. It is concerned with modern materials science and combines explorative research in physics, chemistry and materials science with technological development of new materials and products. At present the IFW employs about 530 people, among them 200 scientists, mostly physicists, chemists and materials engineers. The annual budget of 29 Million Euro (2012) is supplied by the Federal government and by the German states in equal parts, the latter mainly by the Free State of Saxony. In addition to institutional funding, the IFW Dresden raises project resources of about 11 Million Euro per year.

For more information, please click here

Contacts:
Prof. Dr. Michael Ruck
Technische Universität Dresden

Tel. +49 351 463-33244

Prof. Dr. Jeroen van den Brink
IFW Dresden

Tel. +49 351 4659-400

Copyright © TU Dresden

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

Graphene

FLAG-ERA and TNT2014 join efforts: Graphene Networking at its higher level in Barcelona: Encourage the participation in a joint transnational call July 30th, 2014

News and information

University of Manchester selects Anasys AFM-IR for coatings and corrosion research July 30th, 2014

Nature inspires a greener way to make colorful plastics July 30th, 2014

Analytical solutions from Malvern Instruments support University of Wisconsin-Milwaukee researchers in understanding environmental effects of nanomaterials July 30th, 2014

FEI Unveils New Solutions for Faster Time-to-Analysis in Metals Research July 30th, 2014

Chip Technology

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

Nanometrics Announces Upcoming Investor Events July 22nd, 2014

Penn Study: Understanding Graphene’s Electrical Properties on an Atomic Level July 22nd, 2014

Nanoelectronics

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

3-D nanostructure could benefit nanoelectronics, gas storage: Rice U. researchers predict functional advantages of 3-D boron nitride July 15th, 2014

IBM Announces $3 Billion Research Initiative to Tackle Chip Grand Challenges for Cloud and Big Data Systems: Scientists and engineers to push limits of silicon technology to 7 nanometers and below and create post-silicon future July 10th, 2014

Discoveries

Watching Schrödinger's cat die (or come to life): Steering quantum evolution & using probes to conduct continuous error correction in quantum computers July 30th, 2014

From Narrow to Broad July 30th, 2014

Optimum inertial design for self-propulsion: A new study investigates the effects of small but finite inertia on the propulsion of micro and nano-scale swimming machines July 29th, 2014

A new way to make microstructured surfaces: Method can produce strong, lightweight materials with specific surface properties July 29th, 2014

Materials/Metamaterials

From Narrow to Broad July 30th, 2014

Nature inspires a greener way to make colorful plastics July 30th, 2014

Tough foam from tiny sheets: Rice University lab uses atom-thick materials to make ultralight foam July 29th, 2014

A new way to make microstructured surfaces: Method can produce strong, lightweight materials with specific surface properties July 29th, 2014

Announcements

University of Manchester selects Anasys AFM-IR for coatings and corrosion research July 30th, 2014

Nature inspires a greener way to make colorful plastics July 30th, 2014

Analytical solutions from Malvern Instruments support University of Wisconsin-Milwaukee researchers in understanding environmental effects of nanomaterials July 30th, 2014

FEI Unveils New Solutions for Faster Time-to-Analysis in Metals Research July 30th, 2014

Research partnerships

Breakthrough laser experiment reveals liquid-like motion of atoms in an ultra-cold cluster: University of Leicester research team unlocks insights into creation of new nano-materials July 25th, 2014

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

Penn Study: Understanding Graphene’s Electrical Properties on an Atomic Level July 22nd, 2014

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 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE