Featured Research

from universities, journals, and other organizations

Novel materials become multifunctional at ultimate quantum limit

Date:
September 25, 2012
Source:
University of Arkansas, Fayetteville
Summary:
Physicists 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.

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.


Story Source:

The above story is based on materials provided by University of Arkansas, Fayetteville. Note: Materials may be edited for content and length.


Cite This Page:

University of Arkansas, Fayetteville. "Novel materials become multifunctional at ultimate quantum limit." ScienceDaily. ScienceDaily, 25 September 2012. <www.sciencedaily.com/releases/2012/09/120925091346.htm>.
University of Arkansas, Fayetteville. (2012, September 25). Novel materials become multifunctional at ultimate quantum limit. ScienceDaily. Retrieved July 29, 2014 from www.sciencedaily.com/releases/2012/09/120925091346.htm
University of Arkansas, Fayetteville. "Novel materials become multifunctional at ultimate quantum limit." ScienceDaily. www.sciencedaily.com/releases/2012/09/120925091346.htm (accessed July 29, 2014).

Share This




More Computers & Math News

Tuesday, July 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Teen's Phone Ignites Under Her Pillow; How Real Is The Risk?

Teen's Phone Ignites Under Her Pillow; How Real Is The Risk?

Newsy (July 28, 2014) A Texas teen's Samsung phone apparently ignited while she slept, but what was the real problem here? Video provided by Newsy
Powered by NewsLook.com
Google's Next Frontier: The Human Body

Google's Next Frontier: The Human Body

Newsy (July 27, 2014) Google is collecting genetic and molecular information to paint a picture of the perfectly healthy human. Video provided by Newsy
Powered by NewsLook.com
Cellphone Unlocking Bill Clears U.S. House, Heads to Obama

Cellphone Unlocking Bill Clears U.S. House, Heads to Obama

Reuters - US Online Video (July 27, 2014) Congress gets rid of pesky law that made it illegal to "unlock" mobile phones without permission, giving consumers the option to use the same phone on a competitor's wireless network. Mana Rabiee reports. Video provided by Reuters
Powered by NewsLook.com
Congress OKs Unlocking Phones From Carriers

Congress OKs Unlocking Phones From Carriers

Newsy (July 26, 2014) A bill legalizing "unlocking," or untethering a phone from its default wireless carrier, has passed Congress and is expected to be signed into law. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins