Navigation Links
Graphene exhibits bizarre new behavior well suited to electronic devices
Date:7/29/2010

y interesting behavior because the electrons spin in tiny circles," he said. "This effect gives us a new way to induce this behavior, even in the absence of an actual magnetic field."

Among the unusual behaviors observed of electrons in strong magnetic fields are the quantum Hall effect and the fractional quantum Hall effect, where at low temperatures electrons also fall into quantized energy levels.

The new effect was discovered by accident when a UC Berkeley postdoctoral researcher and several students in Crommie's lab grew graphene on the surface of a platinum crystal. Graphene is a one atom-thick sheet of carbon atoms arranged in a hexagonal pattern, like chicken wire. When grown on platinum, the carbon atoms do not perfectly line up with the metal surface's triangular crystal structure, which creates a strain pattern in the graphene as if it were being pulled from three different directions.

The strain produces small, raised triangular graphene bubbles 4 to 10 nanometers across in which the electrons occupy discrete energy levels rather than the broad, continuous range of energies allowed by the band structure of unstrained graphene. This new electronic behavior was detected spectroscopically by scanning tunneling microscopy. These so-called Landau levels are reminiscent of the quantized energy levels of electrons in the simple Bohr model of the atom, Crommie said.

The appearance of a pseudomagnetic field in response to strain in graphene was first predicted for carbon nanotubes in 1997 by Charles Kane and Eugene Mele of the University of Pennsylvania. Nanotubes are a rolled up form of graphene.

Within the last year, however, Francisco Guinea of the Instituto de Ciencia de Materiales de Madrid in Spain, Mikhael Katsnelson of Radboud University of Nijmegen, the Netherlands, and A. K. Geim of the University of Manchester, England predicted what they termed a pseudo quantum Hall effect in strained graphene . This is the
'/>"/>

Contact: Robert Sanders
rsanders@berkeley.edu
510-643-6998
University of California - Berkeley
Source:Eurekalert  

Page: 1 2 3

Related biology technology :

1. Graphene pioneers follow in Nobel footsteps
2. New graphene-based material clarifies graphite oxide chemistry
3. Researchers discover method for mass production of nanomaterial graphene
4. Light-speed nanotech: Controlling the nature of graphene
5. Scientists prove graphenes edge structure affects electronic properties
6. Graphene yields secrets to its extraordinary properties
7. Graphene may have advantages over copper for IC interconnects at the nanoscale
8. Bilayer graphene gets a bandgap
9. Material world: Graphenes versatility promises new applications
10. UCR scientists manipulate ripples in graphene, enabling strain-based graphene electronics
11. Researchers design new graphene-based, nano-material with magnetic properties
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Graphene exhibits bizarre new behavior well suited to electronic devices
(Date:7/23/2014)... July 23, 2014  Sangamo BioSciences, Inc. (NASDAQ: ... financial results and accomplishments. For the ... consolidated net loss of $7.0 million, or $0.10 per ... or $0.10 per share, for the same period in ... cash, cash equivalents, marketable securities and interest receivable of ...
(Date:7/23/2014)... July 23, 2014 /PRNewswire-iReach/ -- Think Drinks are a ... the long term. They are the first functional focus ... energy as an alternative to the temporary fix associated ... Indiegogo on July 29, 2014, with hopes to raise ... Photo - http://photos.prnewswire.com/prnh/20140723/129697 ...
(Date:7/23/2014)... , July 23, 2014  Having the right people ... vital to accelerating business growth and achieving clinical and ... Association (AHA) Leadership Summit, July 20-22, 2014, in ... of hospital executives and healthcare experts discussing how partnerships ... Carrocino , President & Chief Executive Officer of Cape ...
(Date:7/23/2014)... (PRWEB) July 23, 2014 DuPont Pioneer ... business as vice president of Agricultural Biotechnology (ABT), effective ... where he served most recently as president, chief executive ... and business leadership in the seed and crop protection ... Paul E. Schickler , president of DuPont Pioneer. ...
Breaking Biology Technology:Sangamo BioSciences Reports Second Quarter 2014 Financial Results 2Sangamo BioSciences Reports Second Quarter 2014 Financial Results 3Sangamo BioSciences Reports Second Quarter 2014 Financial Results 4Sangamo BioSciences Reports Second Quarter 2014 Financial Results 5Sangamo BioSciences Reports Second Quarter 2014 Financial Results 6Sangamo BioSciences Reports Second Quarter 2014 Financial Results 7Sangamo BioSciences Reports Second Quarter 2014 Financial Results 8Sangamo BioSciences Reports Second Quarter 2014 Financial Results 9truBrain Neuroscientists To Launch More Effective, Healthier Alternative To Energy Drinks On Indiegogo 2MSC and Cape Regional Medical Center Partner to Improve Cost, Quality and Outcomes 2DuPont Pioneer Names Neal Gutterson to Lead Agricultural Biotechnology 2DuPont Pioneer Names Neal Gutterson to Lead Agricultural Biotechnology 3
... , August 2, 2010 INEOS Group has,today entered into ... AG, one of the world,s leading providers of research led,packaging to the ... complimentary capabilities and,synergy,s of two leading global businesses. , ... INEOS Films ...
... imagine 15,000 of them. A Northwestern University research ... skylines with tiny beams of light using an innovative ... the new method, which could do for nanofabrication what ... transfer, will be published Aug. 1 by the journal ...
... interaction between matter and light represents one of the ... heats up like an oven in the summer due ... that extract electricity from light or light-emitting diodes that ... these processes throughout our daily lives. Understanding the interactions ...
Cached Biology Technology:Bilcare AG to Acquire INEOS' Global Films Business for EUR100 Million 2Bilcare AG to Acquire INEOS' Global Films Business for EUR100 Million 315,000 beams of light 215,000 beams of light 3One more step on the path to quantum computers 2
(Date:7/24/2014)... new drug that successfully treated lupus in mice, a biomedical ... grant to expand his research to a new version of ... of autoimmune diseases., Chandra Mohan, Hugh Roy and Lillie Cranz ... a study in Arthritis Research & Therapy outlining the use ... and reduced the number of cases of lupus-related kidney disease., ...
(Date:7/24/2014)... virus living inside your gut that has gone undetected ... researchers at San Diego State University has found that ... a newly described virus, named crAssphage, which infects one ... Bacteroidetes . This phylum of bacteria is thought to ... The research appears today in Nature Communications ., ...
(Date:7/23/2014)... and the pitcher, a thirsty bird happens upon a vessel ... he finds the water level out of his reach. Not ... pebbles into it one at a time until ... fill. , Highlighting the value of ingenuity, the fable demonstrates ... force. It also characterizes crows as pretty resourceful problem solvers. ...
Breaking Biology News(10 mins):Biomedical engineer looks at new applications for novel lupus drug 2Biomedical engineer looks at new applications for novel lupus drug 3Newly discovered gut virus lives in half the world's population 2Newly discovered gut virus lives in half the world's population 3Smarter than a first-grader? 2Smarter than a first-grader? 3Smarter than a first-grader? 4
... created to provide a haven for both protected species ... Gothenburg have analysed species living on the seabed (benthic ... marine areas require special protection., , "It,s not possible ... park. That,s why I,ve done what experienced mushroom pickers ...
... 12, 2011 The American Society for Microbiology ... http://clinmicro.asm.org , that focuses all of ASM,s clinical and ... "The portal will offer in one site a wealth ... microbiologists and immunologists," said J. Michael Miller, Ph.D., D(ABMM), ...
... consumers like a crisp bite. Apple breeders know that ... in apples. Because new apple varieties must be tested ... are constantly searching for methods to accurately measure traits ... wayusing panels of experts who taste-test each fruit. This ...
Cached Biology News:Life on Kosterhavet's seabed analyzed 2Computerized tool takes a bite out of traditional apple testing 2
...
Corticoliberin...
Microlite 2+ Plate, round bottom; an irradiated, high binding surface with enhanced dynamic range, extra high reflectivity and minimal cross talk for low signal luminescent reactions....
... pressure regulator and pressurized syringe holder for any ... Steady flow rate Microinjecting Fine microliter ... be added to any new or existing perfusion ... even homemade. Connect to house air or a ...
Biology Products: