Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Novel Materials Become Multifunctional at Ultimate Quantum Limit

26.09.2012
A University of Arkansas physicist and his colleagues have examined the lower limits of novel materials called complex oxides and discovered that unlike conventional semiconductors the materials not only conduct electricity, but also develop unusual magnetic properties.

Jak Chakhalian, Jian Liu, Derek Meyers and Benjamin Gray of the University of Arkansas and John W. Freeland and Phillip Ryan of the Advanced Photon Source at Argonne National Laboratory present their ideas in Physical Review Letters.

“Contrary to what we have today in modern microelectronics devices based on silicon, here in a single quantum well, which is just four nanometers thick, we now have several functionalities in one device layer,” said Chakhalian, professor of physics and holder of the Charles and Clydene Scharlau Chair in the J. William Fulbright College of Arts and Sciences. “Engineers can use this class of material to devise new multifunctional devices based on the electrons’ spin.”

The microelectronic materials – semiconductors -- used in today’s computers, have almost reached the lower limitation for size and functionality. Computers run on several semiconducting devices layered together in the very smallest of spaces, known as quantum wells, where nanoscale layers of a semiconducting material are sandwiched between two nanoscale layers of a non-conducting material. However, the researchers found that by using complex oxides with correlated electrons confined to quantum well geometry, they added a new dimension to the mix.

The new structure is based on the concept of correlated charge carriers, like those found in rust, or iron oxide. In rust, if one electron does something, all of the other electrons “know” about it. This phenomenon, called correlated electrons, does not exist in silicon-based materials that run today’s computers, televisions, complex medical equipment,power cell phones and keep the electricity on in homes.

“In normal materials used today, electrons don’t care about the movement of one another,” Chakhalian said. “We can predict their properties almost on the ‘back of an envelope’ with the help of powerful computers.” However, with correlated materials, the calculations for the movement of one electron involve tracking the interactions with billions of electrons, and this is beyond modern theory capabilities.

Chakhalian and his colleagues went down to four atomic layers of a correlated complex oxide material based on nickel and sandwiched it in between two layers of non-conducting oxide material based on aluminum. Unlike the semiconducting materials, the complex oxide structure revealed the unexpected presence of both electronic and magnetic properties.

These multiple properties in a single material may allow the semiconductor industry to push the limits of current conventional computers and develop multiple functions for a single device, possibly allowing everyday electronics to become smaller and faster than they are today.

Chakhalian is a professor in the Institute for Nanoscience and Engineering.

CONTACTS:
Jak Chakhalian, Charles and Clydene Scharlau Professor of Physics
J. William Fulbright College of Arts and Sciences
479-575-4313, jchakhal@uark.edu
Melissa Lutz Blouin, senior director of academic communications
University Relations
479-575-5555, blouin@uark.edu

Melissa Lutz Blouin | Newswise Science News
Further information:
http://www.uark.edu

More articles from Materials Sciences:

nachricht Princeton-UPenn research team finds physics treasure hidden in a wallpaper pattern
20.07.2018 | Princeton University

nachricht Relax, just break it
20.07.2018 | DOE/Argonne National Laboratory

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Future electronic components to be printed like newspapers

A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.

The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

A smart safe rechargeable zinc ion battery based on sol-gel transition electrolytes

20.07.2018 | Power and Electrical Engineering

Reversing cause and effect is no trouble for quantum computers

20.07.2018 | Information Technology

Princeton-UPenn research team finds physics treasure hidden in a wallpaper pattern

20.07.2018 | Materials Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>