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)...   GenoSpace , a precision medicine software company that has ... use of genomic, imaging and other biomedical data in research ... Munson , CEO of Aspera, an IBM Company, to its ... http://photos.prnewswire.com/prnh/20150122/170713 "We are pleased to welcome ...
(Date:12/24/2014)... NEW YORK , Dec. 24, 2014 ... patient care in critical areas, announced the closing of an ... warrants to purchase up to an aggregate 3,500,000 shares of ... and $.01 per warrant.  The warrants have a per share ...
(Date:12/24/2014)... GMO corn cases filed across the United States, and ... being consolidated in a Kansas federal court for pretrial proceedings. ... Corn Litigation, MDL No. 2591 in the U.S. District Court ... GMO corn multidistrict litigation (MDL) has been handed over to ...
(Date:12/24/2014)... York (PRWEB) December 23, 2014 According to ... Long Island Affiliate of ITRA Global, the national office market ... steady recovery. This is evidenced by the third quarter’s ... stock market. Low energy costs have held inflation down ...
Breaking Biology Technology:GenoSpace Expands Board with Appointment of Michelle Munson 2PlasmaTech Biopharmaceuticals, Inc. Announces Closing of Public Offering 2PlasmaTech Biopharmaceuticals, Inc. Announces Closing of Public Offering 3Carey Danis & Lowe Reports on Syngenta GMO Corn Transfer Order 2ITRA Global Reports Long Island Is Out of Sync With The National Office Market 2ITRA Global Reports Long Island Is Out of Sync With The National Office Market 3
... Safeguard Mezzanine Debt Facility; Support Profitable GrowthALISO VIEJO, Calif., ... (Nasdaq: CLRT ), a premier anatomic pathology ... the pharmaceutical industry, announced today that it has completed ... preferred stock with Oak Investment Partners ...
... May 18 /PRNewswire-FirstCall/ - Oncothyreon Inc. (Nasdaq: ... American Society of Clinical Oncology (ASCO) Annual Meeting being ... related to our product candidates Stimuvax(R), PX-866 and PX-12 ... ASCO Web site, www.abstract.asco.org ., ...
... ATLANTA, May 18 /PRNewswire-Asia/ -- Global biomedical sciences ... the year 2008. This rides on,Singapore,s strong scientific ... in 2007. , The ... investment environment, as companies look to the fast ...
Cached Biology Technology:Clarient Completes Second Tranche of Private Placement of Convertible Preferred Stock With Oak Investment Partners 2Clarient Completes Second Tranche of Private Placement of Convertible Preferred Stock With Oak Investment Partners 3Clarient Completes Second Tranche of Private Placement of Convertible Preferred Stock With Oak Investment Partners 4Clarient Completes Second Tranche of Private Placement of Convertible Preferred Stock With Oak Investment Partners 5Clarient Completes Second Tranche of Private Placement of Convertible Preferred Stock With Oak Investment Partners 6Oncothyreon announces presentations at American Society of Clinical Oncology (ASCO) Annual Meeting 2Oncothyreon announces presentations at American Society of Clinical Oncology (ASCO) Annual Meeting 3Biomedical Sciences Companies Expanding in Asia Invested More Than US$500 Million in Singapore 2Biomedical Sciences Companies Expanding in Asia Invested More Than US$500 Million in Singapore 3Biomedical Sciences Companies Expanding in Asia Invested More Than US$500 Million in Singapore 4Biomedical Sciences Companies Expanding in Asia Invested More Than US$500 Million in Singapore 5
(Date:12/22/2014)... Dec. 22, 2014  NXT-ID, Inc. (NASDAQ: NXTD ... focused on the growing mobile commerce market, announces it has ... for the 2015 International CES debut of the Wocket™ ... will be at the NXT-ID booth January 6th and 7 ...
(Date:12/19/2014)... Markets ( http://www.researchandmarkets.com/research/8kmfcn/iphone_5s ) has announced the ... Apple/AuthenTec TMDR92 & Sapphire - Technology Report" report ... Following the acquisition of AuthenTec in ... the iPhone 5S. It is currently the only device ...
(Date:12/19/2014)... VEGAS , Dec. 18, 2014   LaunchKey , ... for the post-password and Internet of Things era, today ... funding. The venture round was led by Metamorphic Ventures ... Rimrock Venture Partners, VegasTechFund, and others.  LaunchKey has raised ...
Breaking Biology News(10 mins):NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 2NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 3NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 4iPhone 5S Fingerprint Sensor - Apple/AuthenTec TMDR92 & Sapphire - Technology Report 2LaunchKey Raises $3 Million in Additional Funding Led by Metamorphic Ventures 2LaunchKey Raises $3 Million in Additional Funding Led by Metamorphic Ventures 3
... Physicists, chemists and engineers at the University of Pennsylvania ... of patchy particles, using charged, self-assembling molecules that may ... and perhaps be used in small batteries that store ... electrical charges of calcium ions just like the ...
... retinal prosthesis and fetal tissue transplant, restored some vision ... at Neuroscience 2009, the annual meeting of the Society ... news on brain science and health, may lead to ... an engineered protein restored vision in an animal model ...
... researchers from the United States, Korea, and France has sequenced ... E. coli bacteria, one used to study evolution ... practical applications. The findings will help guide future research and ... classical research that is the foundation of our understanding of ...
Cached Biology News:Penn team uses self-assembly to make molecule-sized particles with patches of charge 2Experimental treatments restore partial vision to blind people 2Genomes of 2 popular research strains of E. coli sequenced 2Genomes of 2 popular research strains of E. coli sequenced 3
... FLUOstar OPTIMA is a fully automated ... life science labs in academia and ... measurement principles: Fluorescence Intensity ... Time-Resolved Fluorescence including DELFIATM ...
... save space and organize gloves, ... other garb. They are the ... small parts used in labs, ... Open-slot design for easy cleaning. ...
... Security ChemStation is a ... application for data acquisition, ... searching and reporting, addressing ... data security, integrity, and ...
... microRNA expression profiling and built on ... on-chip synthesis platform. These microarrays are ... microRNA Expression Profiling Service. ... Microarray contains all known mammal microRNAs ...
Biology Products: