Navigation Links
Columbia researchers observe tunable quantum behavior in bilayer graphene
Date:7/10/2014

Columbia researchers have observed the fractional quantum Hall effect in bilayer graphene and shown that this exotic state of matter can be tuned by an electric field.

The fractional quantum Hall effect, which can occur when electrons confined to thin sheets are exposed to large magnetic fields, is a striking example of collective behavior where thousands of individual electrons behave as a single system. However, while the basic theory describing this effect is well established, many details of this collective behavior remain not well understood, in part because it is only observable in systems with extremely low disorder.

Graphene, an atomically thin sheet of carbon, is a promising material for study of the fractional quantum Hall effect both because it can it be a nearly defect-free crystal, and because researchers can 'tune' the charge density with an external metal 'gate' electrode and observe how the quantum states evolve in response. Over the past several years, a collaborative effort at Columbia University spanning researchers from Mechanical Engineering, Electrical Engineering and Physics, developed a series of breakthrough fabrication techniques in order to take advantage of this opportunity, allowing them to report the first observation of the fractional quantum Hall effect in graphene in 2009, and the first wide-range tuning of the effect in 2011.

An even more interesting system for study of the fractional quantum Hall effect is so-called bilayer graphene, which consists of two stacked graphene sheets. In this material, use of two metal gate electrodes (above and below) allows independent tuning of the charge density in each layer, which provides a completely new way to manipulate the fractional quantum Hall states. In particular, theory predicts that it should be possible to create exotic 'non-abelian' states that could be used for quantum computation.

While observation of the fractional quantum Hall effect in
'/>"/>

Contact: Beth Kwon
byk2102@columbia.edu
212-854-6581
Columbia University
Source:Eurekalert

Page: 1 2 3

Related biology technology :

1. Columbia Engineering wins $3 million ARPA-E grant to raise efficiency, lower cost of power grid
2. Columbia engineers make worlds smallest FM radio transmitter
3. Genia Technologies, Columbia University, and Harvard University Awarded $5.25 Million Grant from NIH to Accelerate the Development of NanoTag DNA Sequencing Technology
4. Dr. Szczepan Baran will be Presenting at the International Microsurgical Simulation Society at Columbia University in New York
5. Columbias Nursing School Launches "Keep It Clean for Kids" (KICK)
6. Worlds Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program
7. Researchers find that computer components can be damaged by key manufacturing processes
8. York U molecular communication researchers send worlds first text message using vodka
9. Researchers split water into hydrogen, oxygen using light, nanoparticles
10. CWRU engineering researchers report nanoscale energy-efficient switching devices at IEDM 2013
11. Berkeley Lab researchers create a nonlinear light-generating zero-index metamaterial
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/29/2015)... Worth, Texas (PRWEB) May 29, 2015 Translation ... grow. This is for a good reason--if used in a ... wonders for the offering of a business product or service ... which translation can have a positive effect on a company's ... or service that anyone in the world can use, why ...
(Date:5/28/2015)... DUBLIN , May 28, 2015 ... Markets ( http://www.researchandmarkets.com/research/8h5hs2/animal ) has announced the ... "Animal Biotechnology - Technologies, Markets and ... http://photos.prnewswire.com/prnh/20130307/600769) , ,This report describes and ... in veterinary medicine and pharmaceuticals as ...
(Date:5/28/2015)... -- Research and Markets( http://www.researchandmarkets.com/research/3nl6s2/neuroprotection ) has announced ... "Neuroprotection - Drugs, Markets and Companies" to ... role of neuroprotection in acute disorders such as ... well as in chronic diseases such as neurodegenerative ... damage to neural tissues are similar in all ...
(Date:5/28/2015)... May 28, 2015 DryLet, LLC ... in applications such as animal waste reduction, bioremediation, ... reduction in wastewater treatment plants and restaurant kitchen ... World Pork Expo, June 3-5 in Des Moines, ... in a Wall Street Journal article because of ...
Breaking Biology Technology:Three Ways Translation Can Help Businesses Grow 2Global Animal Biotechnology Report 2015 - Technologies, Markets and Companies Analysis to 2024 2Global Animal Biotechnology Report 2015 - Technologies, Markets and Companies Analysis to 2024 3Global Neuroprotection Market Report 2015-2024 - Drugs, Markets and Companies 2Global Neuroprotection Market Report 2015-2024 - Drugs, Markets and Companies 3DryLet to Showcase Patented ManureMagicâ„¢ at the 2015 World Pork Expo, June 3-5 in Des Moines, Iowa 2
... 10, 2010 Ramius V&O Acquisition LLC, a subsidiary ... has sent a letter to the Board of Directors ... outlining its willingness to acquire all of Cypress, outstanding ... share.  The offer is conditioned upon Cypress commencing exclusive ...
... closer to creating robust, three-dimensional microbatteries that would ... lithium-ion batteries. They could power new generations of ... and biomedical devices. The batteries employ vertical ... a widely used polymer best known as Plexiglas. ...
... Dec. 9, 2010 Prometheus Laboratories Inc., a specialty ... University of California, Los Angeles campus, today announced the ... on the identification of biological markers of mucosal healing ... will be led by Dr. Jonathan Braun, Chair of ...
Cached Biology Technology:Ramius Offers to Enter Into Immediate and Exclusive Negotiations to Acquire Cypress Bioscience for $5.50 Per Share 2Ramius Offers to Enter Into Immediate and Exclusive Negotiations to Acquire Cypress Bioscience for $5.50 Per Share 3Ramius Offers to Enter Into Immediate and Exclusive Negotiations to Acquire Cypress Bioscience for $5.50 Per Share 4Ramius Offers to Enter Into Immediate and Exclusive Negotiations to Acquire Cypress Bioscience for $5.50 Per Share 5Ramius Offers to Enter Into Immediate and Exclusive Negotiations to Acquire Cypress Bioscience for $5.50 Per Share 6Better batteries from the bottom up 2Prometheus Laboratories and UCLA Sign Agreement to Validate Biological Markers of Mucosal Healing in IBD 2
(Date:5/22/2015)... May 22, 2015  NXT-ID, Inc. (NASDAQ: NXTD ) ... will be ending its promotional pricing and making the Wocket ... Laurence Savin , Head of Marketing said, "We,ve extended ... until the end of May. To get your wocket at ... we open the store on June 1, you,ll receive a ...
(Date:5/21/2015)... The Sync Project™ , a global ... today announced a collaborative partnership with Berklee,s Institute ... on collaboration on original research, joint course development and ... collaboration, The Sync Project and BerkleeICE are exploring the ... the 2015-2016 academic year.  The course ...
(Date:5/19/2015)... May 18, 2015 Fingerprint Cards (FPC) ... FPC1025, FPC1145, FPC1155 and FPC1035 from one if its module ... and including Q3 2015 and the sensors will be used ... order values for 2015 hereby amount to 740 MSEK to ... of 140 MSEK and a number of smaller orders not ...
Breaking Biology News(10 mins):NXT-ID, Inc Announces Retail Price For Wocket Smart Wallet And Extends Discounted Promotional Price Till End Of May 2NXT-ID, Inc Announces Retail Price For Wocket Smart Wallet And Extends Discounted Promotional Price Till End Of May 3The Sync Project Announces Partnership with Berklee College of Music's Institute for Creative Entrepreneurship 2The Sync Project Announces Partnership with Berklee College of Music's Institute for Creative Entrepreneurship 3Fingerprint Cards Receives Touch Fingerprint Sensor Order of SEK 230 Million and Raises Revenue Guidance for 2015 2
... do a herd of gazelles and a fluffy mass ... describes the population dynamics of such prey animals as ... the relationship between cloud systems, rain and tiny floating ... understand, among other things, how human-produced aerosols affect rainfall ...
... July 25, 2011 Shenzhen, China -- The study ... African genome was published online in Nature Biotechnology ... as the Beijing Genomics Institute), the largest genomics organization in ... could serve as a new solution for developing a more ...
... childhood obesity rises and the American diet shifts towards increasing ... concerns about the nutritional quality and the total consumption of ... at the University of North Carolina at Chapel Hill and ... of the American Dietetic Association , eating location and food ...
Cached Biology News:Eat, prey, rain 2BGI develops new strategy to uncover structural variations of human genomes 2BGI develops new strategy to uncover structural variations of human genomes 3Children eating more, and more frequently outside the home 2
IKKbeta/IKK-2 Polyclonal Antibody 100 ug affinity purified rabbit polyclonal antibody. Reacts with human. Tested in Western blotting....
...
Request Info...
... EasyComp Transformation Kit is designed for ... cells. Advantages over commonly used transformation ... LiCl methods include:- Cells can be made ... - Competent cell preparation and transformation solutions ...
Biology Products: