Featured Research

from universities, journals, and other organizations

Researchers Show An Experimental Solution For A Technologically Important 2-D Surface

Date:
May 10, 2000
Source:
University Of Arkansas
Summary:
Using the world’s strongest microscope to peer at atoms, University of Arkansas researchers have made discoveries about the surface of a two-dimensional crystal that will allow researchers to better understand and manipulate gallium arsenide (GaAs), a material commonly used in lasers for CD players, high-speed fiber-optic telecommunication equipment and transistors for cellular phones.

FAYETTEVILLE, Ark. — Using the world’s strongest microscope to peer at atoms, University of Arkansas researchers have made discoveries about the surface of a two-dimensional crystal that will allow researchers to better understand and manipulate gallium arsenide (GaAs), a material commonly used in lasers for CD players, high-speed fiber-optic telecommunication equipment and transistors for cellular phones.

Paul Thibado, Vincent P. LaBella, D.W. Bullock, M. Anser, Z. Ding, C. Emery and Laurent Bellaiche, all of the physics department, found that the two-dimensional surface of the crystal forms a system predicted by the Ising model, a cornerstone in the field of many-body physics. They report their findings in today’s issue of Physical Review Letters.

"We have defined what governs atomic movement at the surface," Thibado said. "It’s a whole new way of looking at these systems."

Scientists make high-tech communications devices by depositing layers of atoms on top of this single crystal surface. To produce better devices, researchers need a fundamental understanding of the physics that governs the motion of atoms on that surface.

Thibado and LaBella’s group have for the first time looked at images of individual atoms on the surface of a crystal and charted their presence or absence as they form islands at high temperatures.

They found that the spontaneous formation of atomic islands follows the Ising model, which describes a large collection of objects interacting with their neighbors. Earnst Ising originally developed the model in 1926 to explain the spontaneous magnetization of magnetic materials as they are cooled from high temperatures. As a graduate student, Ising solved the model in one dimension.

About 20 years later Lars Onsager solved the Ising model in two dimensions, a solution considered to be one of the greatest theoretical achievements of the 20th century. The two-dimensional model is expressed in the GaAs system, according to the researchers.

LaBella illustrates the Ising model using a social phenomenon like the Pokemon craze: It came about by word-of-mouth, spreading from neighbor to neighbor. Last summer, Pokemon caught on like wildfire, and now everyone seems to know about it. The atoms on the crystal surface behave in the same way, going from a few atoms present on the surface to many in a flash, at a certain critical temperature.

By applying the Ising model to this surface, scientists can model the growth of a device and potentially become more efficient in creating useful materials.


Story Source:

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


Cite This Page:

University Of Arkansas. "Researchers Show An Experimental Solution For A Technologically Important 2-D Surface." ScienceDaily. ScienceDaily, 10 May 2000. <www.sciencedaily.com/releases/2000/05/000510065322.htm>.
University Of Arkansas. (2000, May 10). Researchers Show An Experimental Solution For A Technologically Important 2-D Surface. ScienceDaily. Retrieved September 16, 2014 from www.sciencedaily.com/releases/2000/05/000510065322.htm
University Of Arkansas. "Researchers Show An Experimental Solution For A Technologically Important 2-D Surface." ScienceDaily. www.sciencedaily.com/releases/2000/05/000510065322.htm (accessed September 16, 2014).

Share This



More Matter & Energy News

Tuesday, September 16, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Manufacturer Prints 3-D Car In Record Time

Manufacturer Prints 3-D Car In Record Time

Newsy (Sep. 15, 2014) — Automobile manufacturer Local Motors created a drivable electric car using a 3-D printer. Printing the body only took 44 hours. Video provided by Newsy
Powered by NewsLook.com
Refurbished New York Subway Tunnel Unveiled After Sandy Damage

Refurbished New York Subway Tunnel Unveiled After Sandy Damage

Reuters - US Online Video (Sep. 15, 2014) — New York officials unveil subway tunnels that were refurbished after Superstorm Sandy. Nathan Frandino reports. Video provided by Reuters
Powered by NewsLook.com
Frustration As Drone Industry Outpaces Regulation In U.S.

Frustration As Drone Industry Outpaces Regulation In U.S.

Newsy (Sep. 14, 2014) — U.S. firms worry they’re falling behind in the marketplace as the FAA considers how to regulate commercial drones. Video provided by Newsy
Powered by NewsLook.com
Smart Gun Innovators Fear Backlash From Gun Rights Advocates

Smart Gun Innovators Fear Backlash From Gun Rights Advocates

Newsy (Sep. 14, 2014) — Winners of a contest for smart gun design are asking not to be named after others in the industry received threats for marketing similar products. 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