Navigation Links
Graphene may gain an 'on-off switch,' adding semiconductor to long list of material's achievements
Date:6/17/2011

College Park, MD (June 17, 2011)--A team of researchers has proposed a way to turn the material graphene into a semiconductor, enabling it to control the flow of electrons with a laser "on-off switch".

Graphene is thinnest and strongest material ever discovered. It's a layer of carbon atoms only one-atom thick, but 200 times stronger than steel. It also conducts electricity extremely well and heat better than any other known material. It is almost completely transparent, yet so dense that not even atoms of helium can penetrate it. In spite of the impressive list of promising prospects, however, graphene appears to lack a critical property -- it doesn't have a "band gap."

A band gap is the basic property of semiconductors, enabling materials to control the flow of electrons. This on-off property is the foundation of computers, encoding the 0s and 1s of computer languages.

Now, a team of researchers at the National University of Crdoba and CONICET in Argentina; the Institut Catala de Nanotecnologia in Barcelona, Spain; and RWTH Aachen University, Germany; suggest that illuminating graphene with a mid-infrared laser could be a key to switch off conduction, thereby improving the possibilities for novel optoelectronic devices.

In an article featured in Applied Physics Letters, the researchers report on the first atomistic simulations of electrical conduction through a micrometer-sized graphene sample illuminated by a laser field. Their simulations show that a laser in the mid-infrared can open an observable band gap in this otherwise gapless material.

"Imagine that by turning on the light, graphene conduction is turned off, or vice versa. This would allow the transduction of optical into electrical signals," says Luis Foa Torres, the researcher leading this collaboration. "The problem of graphene interacting with radiation is also of current interest for the understanding of more exotic states of matter such as the topological insulators."


'/>"/>

Contact: Charles E. Blue
cblue@aip.org
301-209-3091
American Institute of Physics
Source:Eurekalert  

Related biology technology :

1. Singapore researchers invent broadband graphene polarizer
2. University of Houston develops method for creating single-crystal arrays of graphene
3. Defect in graphene may present bouquet of possibilities
4. Activated graphene makes superior supercapacitors for energy storage
5. Why graphene holds the key to the future
6. GRAPHENE-CA appointed an EU Future Emerging Technology flagship pilot
7. 2 graphene layers may be better than 1
8. Researchers pinpoint graphenes varying conductivity levels
9. UMD scientists make magnetic new graphene discovery
10. New spin on graphene
11. Self-cooling observed in graphene electronics
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Graphene may gain an 'on-off switch,' adding semiconductor to long list of material's achievements
(Date:8/15/2017)... ... 15, 2017 , ... Kapstone Medical is proud to announce that ... technology companies and inventors develop and safeguard their latest innovations. The company has ... a portfolio of clients in the United States and around the world. , ...
(Date:8/15/2017)... ... 2017 , ... Pittcon is pleased to once again co-program ... This year’s symposium, organized by the Pittcon 2018 program chair, Annette Wilson, (University ... dynamic presentation will discuss novel ionization processes, high throughput IMS-MS technologies, and top ...
(Date:8/15/2017)... , ... August 15, 2017 , ... ... family of 6” modular downlights designed to stay tightly sealed and perform efficiently ... where damp and wet location listings just aren't enough, such as: hospitals; behavioral ...
(Date:8/15/2017)... ... August 15, 2017 , ... ... by various biotic and abiotic factors. During this educational webinar, participants will learn ... as well as gain a better understanding of how genomics is important for ...
Breaking Biology Technology:
(Date:4/4/2017)... , April 4, 2017   EyeLock LLC ... announced that the United States Patent and Trademark Office ... broadly covers the linking of an iris image with ... transaction) and represents the company,s 45 th issued ... patent is very timely given the multi-modal biometric capabilities ...
(Date:3/29/2017)... 29, 2017  higi, the health IT company that ... North America , today announced a Series B ... of EveryMove. The new investment and acquisition accelerates higi,s ... to transform population health activities through the collection and ... higi collects and secures data today on behalf ...
(Date:3/23/2017)... , March 23, 2017 The report "Gesture Recognition and ... Industry, and Geography - Global Forecast to 2022", published by MarketsandMarkets, the market ... CAGR of 29.63% between 2017 and 2022. Continue ... ... ...
Breaking Biology News(10 mins):