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:1/22/2015)... GEA Niro Soavi the leader in high ... PandaPLUS 2000, which is ideal for new applications for ... disruption . This compact laboratory homogenizer is the perfect ... food additives and ingredients as well as for the ...
(Date:1/22/2015)... (PRWEB) January 22, 2015 Protocol Networks ... The growing team of brand-neutral, independent consultants, Protocol Networks ... Rogers explained that over the years, his company has ... Moroso, Town of Plainfield, as well as others. With ...
(Date:1/22/2015)... Dr. Greg Leyer of UAS Labs recently was invited to ... on probiotics in San Diego, CA. , The Scripps ... health care professionals. This year’s pre-conference seminar was held on ... Dr. Leyer spoke about the emerging topics and science in ...
(Date:1/22/2015)... NEW BRUNSWICK , Nueva Jersey , 22 ... Award for Biomedical Research abre hoy su llamada ... las personas cuya investigación científica ha hecho, o tiene ... de la salud humana. Las nominaciones se aceptarán hasta ...
Breaking Biology Technology:GEA Niro Soavi Announces the PandaPLUS 2000 Homogenizer for Processing New Applications for Nanoemulsions and Cell Disruption 2Protocol Networks Brings Independent Technology Consulting to the Constitution State 2El Dr. Paul Janssen Award for Biomedical Research emite su llamada a los nominados para 2015 2El Dr. Paul Janssen Award for Biomedical Research emite su llamada a los nominados para 2015 3El Dr. Paul Janssen Award for Biomedical Research emite su llamada a los nominados para 2015 4
... State spending on information technology may soon be subject ... costing tens of millions of dollars each, have failed ... and representative Suzanne Jeskewitz, co-chairs of the Joint Audit ... developed or renovated recently are inefficient or non-functional, and ...
... citywide wireless network in Milwaukee, the surrounding communities of ... , ,Waukesha and Wauwatosa are already being pitched by ... the city of Madison. Milwaukee's network is being built ... the deals established so far, the city is essentially ...
... At $2.5 million per 30-second spot, the average 2006 ... TV advertising has never been more affordable for small ... Spot Runner , it's possible to implement a comprehensive ... at a fraction of the normal cost. You can ...
Cached Biology Technology:Local TV advertising - Super Bowl vs. super bargain 2Local TV advertising - Super Bowl vs. super bargain 3Local TV advertising - Super Bowl vs. super bargain 4
(Date:1/22/2015)... ("Company") (BM&FBOVESPA: VLID3 ON), is pleased to inform its shareholders ... Washington,s Department of Licensing, in the United States, awarded ... for driver,s licenses and identification cards to its subsidiary, Valid ... start in January 2015, with enrollment and card production starting ...
(Date:1/22/2015)... , Jan. 13, 2015  Today, FreeWavz ( www.FreeWavz.com ... its crowdfunding campaign on Fundable, https://www.fundable.com/freewavz . ... of production capacity to meet customer demand. ... - http://photos.prnewswire.com/prnh/20150113/168790 Invented ...
(Date:1/22/2015)... 15, 2015  BellBrook Labs, a leader in high ... launch of a TR-FRET (time resolved Forster resonance ... Assay, a high throughput screening assay for glycosyltransferases ... allow for sensitive detection of hundreds of human ...
Breaking Biology News(10 mins):Valid USA Signs Contract For Washington Driver's License Issuance 2FreeWavz Launches on Fundable to Drive Speed-to-Market in 2015 2BellBrook Labs Launches a High Throughput Screening Assay for Glycosyltransferases with TR-FRET Readout 2
... Jan. 8, 2009 Physician-scientists from the Translational ... their latest findings and techniques at a national conference ... their patients. "Molecular Oncology: The Sixth Vital Sign, ... cancer doctors provide better diagnosis, early detection as well ...
... in the brain,s hippocampus, but what controls this birth has ... Science , neuroscientists at the Johns Hopkins University School ... which depends on brain activity, also depends on a protein ... genetic material. "How is it that when you ...
... DALLAS Jan. 8, 2009 Dr. Rama Ranganathan, professor ... as one of the state,s top rising stars in research ... (TAMEST). Dr. Ranganathan was named a recipient of one ... academy at its annual conference in Dallas. Dr. Ranganathan is ...
Cached Biology News:Phoenix conference highlights TGen's and Scottsdale Healthcare's contributions to molecular oncology 2Growth of new brain cells requires 'epigenetic' switch 2UT Southwestern scientist honored among best in Texas research 2UT Southwestern scientist honored among best in Texas research 3
...
D.R. Harper (1993) • Includes: essential information on taxonomy, culture and safe handling of viruses, immunology, monoclonal antibodies, antivirals and vaccines....
... (1995) • This book is unique ... and molecular techniques currently used in ... analysis of virus-specific antibodies and clinical ... covering immunoassays, blotting and hybridization procedures, ...
Bovine Serum...
Biology Products: