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:9/19/2014)... to move data would consume much less power ... as chips, transistor counts rise. , Of the ... emitters, modulators, and detectors emitters are the ... optical chips is molybdenum disulfide (MoS2), which has ... atom-thick layer. Other experimental on-chip light emitters have ...
(Date:9/19/2014)... SAN DIEGO , Sept. 19, 2014 ... engaged in the development of high-value and difficult to ... will be presenting at the 21 st Annual ... New York . Bertrand Liang , chief ... the company,s development programs and business strategy on Friday, ...
(Date:9/19/2014)... , September 19, 2014 ... 53rd European Society for Paediatric Endocrinology (ESPE) Meeting  ... science and medical research in the field of growth  ... KGaA, Darmstadt, Germany , today announced ... (GGI) for 2014. The awards were announced during a ...
(Date:9/18/2014)... DALLAS , Sept. 18, 2014 /PRNewswire-iReach/ -- ... and China Acetic Acid Industry" and "2014 Deep ... Industry" reports to its research database. ... 2014 Deep Research Report on Global and China ... research report on China ...
Breaking Biology Technology:Toward optical chips 2Toward optical chips 3Pfenex to Present at Upcoming Industry Conference on September 26 2EMD Serono Awards Grant for Growth Innovation (GGI) for the First Time 2EMD Serono Awards Grant for Growth Innovation (GGI) for the First Time 3Acetic Acid Market & Sodium Stannate Industry (China, Global) Research Report 2Acetic Acid Market & Sodium Stannate Industry (China, Global) Research Report 3Acetic Acid Market & Sodium Stannate Industry (China, Global) Research Report 4
... 10, 2009, NeoStem, Inc. (NYSE Alternext US: NBS) (the ... "Alternext") indicating that the Company is not in compliance ... "Guide"), which requires a listed company to hold meetings ... Company had announced that it planned to hold a ...
... ITMN ) today announced the pricing of an underwritten ... The last reported sale price of InterMune,s common stock on ... $17.96. The offering is expected to close on or ... All of the shares are being sold by the company.UBS ...
... Pharmacyclics, Inc.,(Nasdaq: PCYC ) today reported financial ... net loss for the second quarter of fiscal 2009,was $4.8 ... of $5.9 million,or $0.23 per share, in the second quarter ... expenses were $4.9 million in the second quarter of fiscal,2009, ...
Cached Biology Technology:NeoStem Receives Notice of Noncompliance from NYSE Alternext US 2InterMune Announces Pricing of Public Offering of 3,500,000 Shares of Common Stock 2Pharmacyclics Reports Second Quarter Fiscal 2009 Financial Results 2Pharmacyclics Reports Second Quarter Fiscal 2009 Financial Results 3Pharmacyclics Reports Second Quarter Fiscal 2009 Financial Results 4Pharmacyclics Reports Second Quarter Fiscal 2009 Financial Results 5Pharmacyclics Reports Second Quarter Fiscal 2009 Financial Results 6Pharmacyclics Reports Second Quarter Fiscal 2009 Financial Results 7
(Date:9/21/2014)... warming, are set to rise again in 2014 - reaching ... per cent projected rise in burning fossil fuels is revealed ... UK by researchers at the Tyndall Centre for Climate Change ... of Engineering, Mathematics and Physical Sciences at the University of ... Summit, where world leaders will seek to catalyse action on ...
(Date:9/21/2014)... California, San Diego, have developed a program that predicts ... of genes based on sequences of DNA. They describe ... human embryonic cells in a paper published in ... our cells have the same blueprint, the same DNA, ... author of the report. "Skin cells protect, nerve cells ...
(Date:9/21/2014)... strains of bacteria have emerged that resist even the ... forms of tuberculosis and staphylococcus, infect more than 2 ... the urgent need for new treatments, scientists have discovered ... decade. , MIT engineers have now turned a powerful ... that can disable any target gene, they have shown ...
Breaking Biology News(10 mins):CO2 emissions set to reach new 40 billion ton record high in 2014 2CO2 emissions set to reach new 40 billion ton record high in 2014 3Program predicts placement of chemical tags that control gene activity 2Battling superbugs 2Battling superbugs 3Battling superbugs 4
... from ESA,s Envisat satellite radar are being used to ... Globe solo round-the-world yacht race. CLS, a subsidiary ... new radar applications division (formerly the BOOST Technologies Company), ... Envisat radar imagery to operationally observe oceans at high ...
... seascape that cleaves earlier each springthey may find relief in ... changes in the timing of sea-ice breakup and of snow ... least some polar bears with an alternative source of food. ... "Over 40 years, six subadult male bears were seen among ...
... battle against invading bacteria reaches its peak activity at ... Experiments with the laboratory model organism, Drosophila melanogaster, reveal ... with the body,s circadian rhythm, according to Stanford researchers ... Cell Biology (ASCB) 48th Annual Meeting, Dec. 13-17, 2008 ...
Cached Biology News:Vendee Globe route seen from above 2Goose eggs may help polar bears weather climate change 2Immunity stronger at night than during day 2
...
Ultra-sensitive, non-radioactive detection of rat Osteopontin...
Agarose-LE, 250 g. Suitable for soft agarose cloning. Nuclease-free.Gel point (1.5%): 36 1.5 C, EEO (-mr): 1200 g/cm2. Category: Nucleotides & Enzymes & Biochemicals, Ultrapure Biochemicals ....
Request Info...
Biology Products: