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

single layer graphene required simply making cleaner devices, observing this effect in bilayer graphene proved more difficult. "We knew that we could fabricate very clean bilayer graphene structures, but we suffered from our inability to make good electrical contact since bilayer graphene develops an electronic 'band-gap' under the high magnetic fields and low temperatures required for our experiments," says Cory Dean, professor of Physics who recently moved to Columbia University, and lead author on the paper. A critical breakthrough was re-design of the devices so that the charge density in the contact regions could be tuned independently from the rest of the device, which allowed them to maintain good electrical contact even under large magnetic fields. "Once we had this new device structure the results were spectacular."

Reporting in the July 4, 2014 edition of Science, the team demonstrates the existence of the fractional quantum Hall effect in bilayer graphene and shows evidence of a controllable phase transition by application of electric fields. One of the key questions towards understanding the fractional quantum Hall effect in any system is to identify the order associated with the ground state. For example, do all electrons associated within the collective state carry the same spin? In bilayer graphene this question is more complex since there are several degrees of symmetry at play all at once. In addition to spin, electrons can polarize by spontaneously residing entirely on one layer versus the other. This complexity provides an interesting new phase space to explore for new and unusual effects. In particular, several theories have predicted that application of electric fields to bilayer graphene could enable transitions between these ground state orders. "This is a new experimental knob that just is not available in other systems," says James Hone, a professor of Mechanical Engineering and co-author on the paper. The team has confirm
'/>"/>

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:2/26/2015)... WOODBRIDGE, N.J. , Feb. 26, 2015 ... and its affiliated companies, Wilentz, Goldman & ... a trade secrets lawsuit against Genewiz Inc. in excess ... obtained and utilized GenScript,s trade secrets, and that it ... court entered an order denying motions for judgment notwithstanding ...
(Date:2/26/2015)... 2015   Synageva BioPharma Corp. (NASDAQ: ... therapeutic products for rare disorders, today reported 2014 ... other key objectives, and financial guidance.  Synageva,s management ... 4:30 p.m. EST to review the financial results ... in today,s call by telephone, please dial (877) ...
(Date:2/26/2015)... LAUDERDALE, Fla. , Feb. 26, 2015 ... discussed growth priorities driven by key research advancements and ... segments at today,s Bank of America Merrill Lynch 2015 ... met the challenge of building grain supplies the last ... to continue at the pace of the last decade, ...
(Date:2/26/2015)... Calif. , Feb. 26, 2015  NuGene ... age-defying aesthetic products for skin and hair rejuvenation, ... Relations as agency of record for investor relations ... to improve our distribution, sales and diversification strategies ... to current and prospective shareholders," stated Ali Kharazmi ...
Breaking Biology Technology:Wilentz Client GenScript Awarded $10 Million in Trade Secrets Case Against Genewiz 2Wilentz Client GenScript Awarded $10 Million in Trade Secrets Case Against Genewiz 3Synageva BioPharma Reports 2014 Full Year Financial Results 2Synageva BioPharma Reports 2014 Full Year Financial Results 3Synageva BioPharma Reports 2014 Full Year Financial Results 4Synageva BioPharma Reports 2014 Full Year Financial Results 5Synageva BioPharma Reports 2014 Full Year Financial Results 6Synageva BioPharma Reports 2014 Full Year Financial Results 7Synageva BioPharma Reports 2014 Full Year Financial Results 8Synageva BioPharma Reports 2014 Full Year Financial Results 9DuPont Leader Outlines Path for Growth in Agriculture and Nutrition & Health Segments 2DuPont Leader Outlines Path for Growth in Agriculture and Nutrition & Health Segments 3DuPont Leader Outlines Path for Growth in Agriculture and Nutrition & Health Segments 4DuPont Leader Outlines Path for Growth in Agriculture and Nutrition & Health Segments 5NuGene International, Inc. Selects Capital Market Relations for Strategic Investor Relations 2NuGene International, Inc. Selects Capital Market Relations for Strategic Investor Relations 3
... BioTrends Research Group, Inc.,released Wave 1 of its ... market research project tracking the launch of,Renvela from ... product,availability. The baseline report was published in December ... month post Renvela launch, and provides,quantitative information from ...
... For the first time, researchers at Delft University of Technology ... in real time. They observed this at the level of ... mechanism is essential as errors in this process can lead ... Institute of Nanoscience Delft are to publish an article on ...
... SAN DIEGO, May 22 Amylin Pharmaceuticals,Inc. (Nasdaq: ... Markets Investor,Conference in New York on Wednesday, May 28, ... M. Kendall, M.D., Executive Director, Medical Affairs of,Amylin Pharmaceuticals, ... presentation and breakout session will be webcast, and a,recording ...
Cached Biology Technology:Awareness of Genzyme's Renvela(R) (Sevelamer Carbonate) is High, Although Uptake of this New Phosphate Binding Agent has Been Slower than Nephrologists and Renal Dietitians Initially Expected 2
(Date:2/24/2015)... YORK , Feb. 24, 2015 This report analyzes ... by the following Segments: Face Biometrics, and Voice Biometrics. The report ... , Japan , Europe , ... & Africa , and Latin America ... 2013 through 2020. Also, a seven-year historic analysis is provided for ...
(Date:2/19/2015)... 2015 Research and Markets ( ... "Military Electro-Optical / Infrared Systems Market by ... - Forecast to 2020" report to their ... market is expected to reach $16.35 billion by ... This report segments the military electro-optical/infrared systems ...
(Date:2/12/2015)... 12, 2015   MedNet Solutions , a ... study management systems, has recently bolstered its ... iMedNet as the eClinical ... and healthcare consultants.  Building on the Program,s existing ... and numerous co-marketing opportunities), MedNet,s new and improved ...
Breaking Biology News(10 mins):World Face and Voice Biometrics Industry 2World Face and Voice Biometrics Industry 3World Face and Voice Biometrics Industry 4World Face and Voice Biometrics Industry 5World Face and Voice Biometrics Industry 6World Face and Voice Biometrics Industry 7World Face and Voice Biometrics Industry 8World Face and Voice Biometrics Industry 9World Face and Voice Biometrics Industry 10World Face and Voice Biometrics Industry 11World Face and Voice Biometrics Industry 12World Face and Voice Biometrics Industry 13World Face and Voice Biometrics Industry 14World Face and Voice Biometrics Industry 15World Face and Voice Biometrics Industry 16Military Electro-Optical / Infrared Systems (Image Intensification, Laser, Infrared) Market - Forecast to 2020: Featuring Profiles of the Market Leaders on this $16 Billion market 2Military Electro-Optical / Infrared Systems (Image Intensification, Laser, Infrared) Market - Forecast to 2020: Featuring Profiles of the Market Leaders on this $16 Billion market 3MedNet Solutions Announces Key Enhancements To Its iMedNet Partner Program 2
... the largely unexplored question of what characteristics make a ... mimicking nature, a robotic fish can transform into a ... experiments, researchers from Polytechnic Institute of New York University ... including learning how robots might someday steer fish away ...
... people have bad teeth replaced with implants. Often following the ... six months, until the implant has become fixated in the ... has been tested on humans allows titanium screws to adhere ... the method report that the results are good. The ...
... Scientists from Binghamton University and Cardiff University, and ... discovery of the floor of the world,s oldest forest ... of Nature , a leading international journal of ... of dinosaur footprints," said William Stein, associate professor of ...
Cached Biology News:What makes a robot fish attractive? (Hint: It's in the moves) 2New method for stronger dental implants 2Floor of oldest forest discovered in Schoharie County 2Floor of oldest forest discovered in Schoharie County 3Floor of oldest forest discovered in Schoharie County 4
... Immunogen : Recombinant human HMGN2/HMG-17 ... BSA, 0.15M NaCl, 0.05% sodium ... glycerol to 30% Quality Assurance: ... acid extracts of murine 10T ...
...
... different human fetal normal tissues are ... upon request. Customers can choose ... set, and pay 70% of the ... P Set products are for research ...
... of buffer and fixative results in ... In Vivo Manual Perfusion Fixation System ... buffer and fixative results in complete ... and clean--Complete system with everything down ...
Biology Products: