Navigation Links
Graphene's high-speed seesaw
Date:4/30/2013

Writing in Nature Communications, the researchers report the first graphene-based transistor with bistable characteristics, which means that the device can spontaneously switch between two electronic states. Such devices are in great demand as emitters of electromagnetic waves in the high-frequency range between radar and infra-red, relevant for applications such as security systems and medical imaging.

Bistability is a common phenomenon a seesaw-like system has two equivalent states and small perturbations can trigger spontaneous switching between them. The way in which charge-carrying electrons in graphene transistors move makes this switching incredibly fast trillions of switches per second.

Wonder material graphene is the world's thinnest, strongest and most conductive material, and has the potential to revolutionise a huge number of diverse applications; from smartphones and ultrafast broadband to drug delivery and computer chips. It was first isolated at The University of Manchester in 2004.

The device consists of two layers of graphene separated by an insulating layer of boron nitride just a few atomic layers thick. The electron clouds in each graphene layer can be tuned by applying a small voltage. This can induce the electrons into a state where they move spontaneously at high speed between the layers.

Because the insulating layer separating the two graphene sheets is ultra-thin, electrons are able to move through this barrier by 'quantum tunnelling'. This process induces a rapid motion of electrical charge which can lead to the emission of high-frequency electromagnetic waves.

These new transistors exhibit the essential signature of a quantum seesaw, called negative differential conductance, whereby the same electrical current flows at two different applied voltages. The next step for researchers is to learn how to optimise the transistor as a detector and emitter.

One of the researchers, Professor Laurence Eaves, said: "In addition to its potential in medical imaging and security screening, the graphene devices could also be integrated on a chip with conventional, or other graphene-based, electronic components to provide new architectures and functionality.

"For more than 40 years, technology has led to ever-smaller transistors; a tour de force of engineering that has provided us with today's state-of-the-art silicon chips which contain billions of transistors. Scientists are searching for an alternative to silicon-based technology, which is likely to hit the buffers in a few years' time, and graphene may be an answer."

"Graphene research is relatively mature but multi-layered devices made of different atomically-thin materials such as graphene were first reported only a year ago. This architecture can bring many more surprises", adds Dr Liam Britnell, University of Manchester, the first author of the paper.


'/>"/>

Contact: Daniel Cochlin
daniel.cochlin@manchester.ac.uk
44-161-275-8382
University of Manchester
Source:Eurekalert

Related biology technology :

1. UK supplier of graphenes announces exclusive sales agency agreement with leading USA distributor
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/18/2017)... Jan. 18, 2017   Boston Biomedical , an ... to target cancer stemness pathways, will feature data from ... at the 2017 ASCO Gastrointestinal Cancers Symposium, held from ... Napabucasin is an orally-administered investigational agent ... i Cancer stem cells (CSCs) possess the property ...
(Date:1/18/2017)... ... 2017 , ... Whitehouse Labs has furthered its efforts towards ... (AMRI), the scientific staff dedicated to Extractables / Leachables & Impurities has more ... 2017. Extractable & Leachable evaluations have become increasingly more vital to successful product ...
(Date:1/18/2017)... ... January 18, 2017 , ... BidMed, LLC, announced it ... and genetic testing lab equipment from two different leading institutes. This highly specialized laboratory ... of the United States. This 1-day online auction will take place on BidMed’s ...
(Date:1/18/2017)...  Caris Life Sciences, a leading innovator in ... private funder of pancreatic cancer research, are collaborating ... of immunotherapy in the treatment of pancreatic cancer. ... identify potential trial candidates based on biomarker expression ... study investigators. The Lustgarten Foundation is a sponsor ...
Breaking Biology Technology:
(Date:1/6/2017)... , Jan. 5, 2017  SomaLogic announced ... "Digital Life Alliance" established by iCarbonX, the ... to build a "Global Digital Health Ecosystem that ... a combination of individual,s biological, behavioral and psychological ... agreement between the companies, SomaLogic will provide proteomics ...
(Date:1/3/2017)... LAS VEGAS , Jan. 3, 2017 ... announced the introduction of Onitor Track, an innovative biometric ... and men, showcasing this month at the 2017 Consumer ... . In the U.S., the World ... affect more than two-thirds of adults who are overweight ...
(Date:12/20/2016)... and GENEVA, Dec, 20, 2016   Valencell ... sensor technology, and STMicroelectronics (NYSE: STM), a ... of electronics applications, announced today the launch of ... for biometric wearables that includes ST,s compact ... Valencell,s Benchmark™ biometric sensor system. Together, SensorTile ...
Breaking Biology News(10 mins):