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:3/30/2015)... OTTAWA , March 30, 2015 /CNW/ - A ... today on the salaries and demographic profiles of new ... "Opening the Door – Building Careers for New Grads ... Canada,s Research-Based Pharmaceutical Companies (Rx&D) and features ... federal Career Focus wage subsidy program from 2013 to ...
(Date:3/30/2015)...  Spherix Incorporated (Nasdaq: SPEX ) -- an intellectual ... monetization of intellectual property, today provided an update ... Spherix v. Uniden , Case No. 3:13-cv-03496-M, both ... Northern District of Texas ... Case No. 1:14-cv-00721-GBL-TCB, in the United States ...
(Date:3/30/2015)... OXFORD, England , March 30, 2015 /PRNewswire/ ... company developing novel biological drugs to treat cancer, ... appointment of Professor Sir John Bell , ... and Chairman of the Office for the Strategic ... Directors with immediate effect.      (Photo: ...
(Date:3/30/2015)... , March 30, 2015 ... Richmond Pharmacology ist das erste Zentrum ... am Royal Free Hospital in London ... Untersuchung eines RNAi-Therapeutikums Studienversuche an einem Patienten begonnen ... Transthyretin vermittelter Amyloidose entwickelt (ATTR), einer seltenen Herz- ...
Breaking Biology Technology:New Report on Graduates in Canadian Biotech Industry Sheds Light on Hiring Practices 2New Report on Graduates in Canadian Biotech Industry Sheds Light on Hiring Practices 3New Report on Graduates in Canadian Biotech Industry Sheds Light on Hiring Practices 4Spherix Provides Update on Litigation vs. VTech, Uniden and Verizon 2Spherix Provides Update on Litigation vs. VTech, Uniden and Verizon 3Immunocore Appoints Professor Sir John Bell to its Board of Directors 2Immunocore Appoints Professor Sir John Bell to its Board of Directors 3Immunocore Appoints Professor Sir John Bell to its Board of Directors 4Immunocore Appoints Professor Sir John Bell to its Board of Directors 5
... PAREXEL International,Corporation (Nasdaq: PRXL ) announced today ... Conference in Boston, MA. Josef von,Rickenbach, Chairman and Chief ... at 3:50 p.m. EDT on Thursday, September 4, 2008., ... available under the,"Upcoming Events" section on PAREXEL,s "Investors" homepage ...
... LLC, a New Jersey-based,leading provider of prescription co-pay ... has significantly expanded the scope of,the lawsuit that ... of the State,of New York, County of New ... subsidiary of McKesson Corporation. PSKW is,now seeking, in ...
... NATICK, Mass. and MUNICH, Germany, Sept. 1 ... today announced one-year data,from its landmark SYNTAX ... TAXUS(R) Express2(TM) Paclitaxel-Eluting Coronary Stent,System to contemporary ... results demonstrated no statistically significant differences,between PCI ...
Cached Biology Technology:PAREXEL International To Present at Thomas Weisel Partners Healthcare Conference 2PSKW Expands Its Lawsuit Against McKesson to Seek Assignment of McKesson's Patent Application 2Landmark SYNTAX Trial Reports Comparable Safety Outcomes for Complex Patients Treated With TAXUS(R) Express2(TM) Stents or Bypass Surgery 2Landmark SYNTAX Trial Reports Comparable Safety Outcomes for Complex Patients Treated With TAXUS(R) Express2(TM) Stents or Bypass Surgery 3Landmark SYNTAX Trial Reports Comparable Safety Outcomes for Complex Patients Treated With TAXUS(R) Express2(TM) Stents or Bypass Surgery 4Landmark SYNTAX Trial Reports Comparable Safety Outcomes for Complex Patients Treated With TAXUS(R) Express2(TM) Stents or Bypass Surgery 5
(Date:3/23/2015)... , March 23, 2015 SoundView Technology Group issues ... (NASDAQ: NXTD ) Wocket smart wallet. SoundView was one of ... on their experience with the Wocket in multiple scenarios and ... Whole Foods and other retailers, making both debit and credit ... also says, "If the company meets their plans in ...
(Date:3/20/2015)... and Markets ( http://www.researchandmarkets.com/research/rswjb4/hand_geometry ) has announced the ... Report" report to their offering. This report ... The report provides separate comprehensive analytics for the US, ... Europe , Asia-Pacific , ... Annual estimates and forecasts are provided for the period ...
(Date:3/17/2015)... Minn. , March 17, 2015 ... technology company specializing in clinical study management systems, ... be in attendance at ARENA,s Outsourcing in Clinical ... NC.  This event provides an excellent forum for ... easy-to-use, flexible and affordable software-as-a-service (SaaS) eClinical technology ...
Breaking Biology News(10 mins):Technology Research Note Update from SoundView; Real-World Usage and Feedback of Wocket Smart Wallet at CVS, Whole Foods and other Retailers 2Technology Research Note Update from SoundView; Real-World Usage and Feedback of Wocket Smart Wallet at CVS, Whole Foods and other Retailers 3Technology Research Note Update from SoundView; Real-World Usage and Feedback of Wocket Smart Wallet at CVS, Whole Foods and other Retailers 4Hand Geometry - Global Strategic Business Report 2015: An Essential Security Component for both Government & Enterprise Sector 2Hand Geometry - Global Strategic Business Report 2015: An Essential Security Component for both Government & Enterprise Sector 3Hand Geometry - Global Strategic Business Report 2015: An Essential Security Component for both Government & Enterprise Sector 4Connect With MedNet Solutions At Outsourcing In Clinical Trials Southeast 2
... , April 17, 2013 Vermillion, Inc. (NASDAQ: ... on gynecologic cancers and women,s health, announced the signing of ... U.S. Army Medical Research and Materiel Command (USAMRMC). ... Reduction Using OVA1 in a Treatment Algorithm for Adnexal ...
... 100% biodiesel (B100) "blend stock" samples by the U.S. ... that 95% of the samples from 2011-12 met ASTM ... guidelines for industry and are designed to ensure quality ... operation of the nation,s vehicles powered by biodiesel blends. ...
... 16, 2013 - BGI Health and ACIBADEM Healthcare ... Company Molecular Biology, signed a Memorandum of Understanding ... technologies to Turkey and improving Turkish reproductive healthcare. ... testing technologies in the areas of Monogenic disorders, ...
Cached Biology News:U.S. Army and Vermillion to Assess Health and Economic Benefits of OVA1 as a Standard of Care 2U.S. Army and Vermillion to Assess Health and Economic Benefits of OVA1 as a Standard of Care 3U.S. Army and Vermillion to Assess Health and Economic Benefits of OVA1 as a Standard of Care 4NREL survey shows dramatic improvement in B100 biodiesel quality 2BGI Health forms partnership with ACIBADEM hospital on genetic disease testing 2
... reagent is formulated specifically for Alkaline Phosphatase ... levels of activity for both the enzyme ... final dilution. This product has been ... the customer a longer shelf life, resistance ...
... Protein DetectorTM Microarray Dot Blot Kits overcome ... and quantitation over a wide range in ... ) detection. They are ideal for ... hundreds of samples for the presence of ...
AC input: 50-60 Hz 115-120 V...
... StabilZyme AP Conjugate Stabilizer is an ... bovine protein and other non-toxic stabilizing ... acid), pH 5.5 6.5. ... 0.02% methylisothiazolone and 0.02% bromonitrodioxane as ...
Biology Products: