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:7/29/2015)... / Japan (Q2 2015: +14% CER / 20% ... high-single-digit growth in China , as well as solid contributions ... Europe / Middle East / ... showed gains in Germany , Turkey ... CER / 49% of sales) grew 11%, excluding U.S. HPV sales, on demand ...
(Date:7/29/2015)... FRANCISCO , July 29, 2015  AsureQuality ... mobile molecular testing for applications in food and ... hand-held, battery powered real-time PCR device, the Freedom4. ... farm right through to the supermarket shelf for ... This includes involvement in animal disease control and ...
(Date:7/29/2015)... ... July 29, 2015 , ... ... announced its GHS Label Guide . To align chemical container labeling with ... guide includes explanations of label components, an example of an accurate label, and ...
(Date:7/29/2015)... SAN DIEGO , July 29, 2015  Pfenex ... quarter 2015 financial results will be released on Thursday, ... 8:30 am Eastern Time, Pfenex management will host a ... a business update.  A press release outlining the financial ... to the call. Please call 1-866-376-8058 (US) ...
Breaking Biology Technology:QIAGEN Reports Results for Second Quarter and First Half of 2015 2QIAGEN Reports Results for Second Quarter and First Half of 2015 3QIAGEN Reports Results for Second Quarter and First Half of 2015 4QIAGEN Reports Results for Second Quarter and First Half of 2015 5QIAGEN Reports Results for Second Quarter and First Half of 2015 6QIAGEN Reports Results for Second Quarter and First Half of 2015 7QIAGEN Reports Results for Second Quarter and First Half of 2015 8QIAGEN Reports Results for Second Quarter and First Half of 2015 9QIAGEN Reports Results for Second Quarter and First Half of 2015 10AsureQuality and Ubiquitome Partner on Applications for Mobile Molecular Food Safety Testing 2Brady Announces a New GHS Label Guide 2Pfenex To Report Second Quarter 2015 Results and Provide Business Update on Thursday, August 13, 2015 2
... therapy with Pfizer,s recently ... MALIBU, Calif., Nov. 15 Pathway Diagnostics announces,that ... U.S. Patent,number 7,294,458 (the ,458 patent) entitled "Analysis of ... Pathway Diagnostics,has licensed the ,458 patent (with rights to ...
... WYE ),today announced that its Board of Directors ... effective immediately. Mr. Davidson will,continue in his role as ... and divisional financial positions since joining the Company,in 1984. ... Chief,Financial Officer, Wyeth Consumer Healthcare and Deputy Treasurer, Wyeth. ...
... Aida,Pharmaceuticals, Inc. (OTC Bulletin Board: AIDA) today announced that ... September 30, 2007. Net,revenues totaled $7,373,770 for the quarter ... in 2006. Gross profit decreased by 2.66% due to ... from Aida,s,transfusion and injection forms of etimicin sulfate increased ...
Cached Biology Technology:Pathway Diagnostics Announces Patent Issuance for the Diagnostic Measurement of HIV Tropism for the Initiation or Modification of HIV Therapy 2Aida Files 10Q 2Aida Files 10Q 3Aida Files 10Q 4
(Date:7/13/2015)... NXT-ID, Inc. (NASDAQ: NXTD ) ("NXT-ID" ... on the growing mobile commerce market, announced today ... BEHAVIORAL-DIRECTED AUTHENTIATION METHOD AND SYSTEM. ... method to make payments.  With this patent, NXT-ID ... its groundbreaking voice-direct payment patent application, with behavior-directed ...
(Date:7/9/2015)... 9, 2015  Synaptics Inc. (NASDAQ: ... interface solutions, today announced a new Match-in-Sensor™ ... hardware encapsulated fingerprint sensor and matching solution. ... literally off the grid, isolating fingerprint image ... the fingerprint sensor to provide ultimate protection ...
(Date:7/8/2015)... , July 8, 2015 The consumer ... this summer,s must have products such as wearables, smart wallets ... popularity for biometrics based devices continues to rapidly grow.  Biometrics ... (NASDAQ: NXTD ), Google Inc. (NASDAQ: GOOG ), ... FIT ), GoPro, Inc. (NASDAQ: GPRO ) and Baidu ...
Breaking Biology News(10 mins):NXT-ID Patents Behavior-Directed Payments 2NXT-ID Patents Behavior-Directed Payments 3NXT-ID Patents Behavior-Directed Payments 4Synaptics Announces World's First Match-in-Sensor Fingerprint Authentication Technology 2Synaptics Announces World's First Match-in-Sensor Fingerprint Authentication Technology 3Consumers Flock to This Summer's Must Have Tech Gadgets as Latest Digital Wallets, Smart Technology & Wearable Products Continue to Grow in Popularity & Functionality 2Consumers Flock to This Summer's Must Have Tech Gadgets as Latest Digital Wallets, Smart Technology & Wearable Products Continue to Grow in Popularity & Functionality 3Consumers Flock to This Summer's Must Have Tech Gadgets as Latest Digital Wallets, Smart Technology & Wearable Products Continue to Grow in Popularity & Functionality 4Consumers Flock to This Summer's Must Have Tech Gadgets as Latest Digital Wallets, Smart Technology & Wearable Products Continue to Grow in Popularity & Functionality 5Consumers Flock to This Summer's Must Have Tech Gadgets as Latest Digital Wallets, Smart Technology & Wearable Products Continue to Grow in Popularity & Functionality 6
... by veterinarians in Scotland leaves cats walking like robots. ... sheds light on cats bred to become mummies in ... converging for the UK,s largest ever veterinary event, the ... published by SAGE, highlights these two fascinating studies among ...
... (April 11, 2012)--On warm days, the beach seems an ideal ... sand castle or been buried up to the neck in ... sand can harbor illness-causing microbes. Unfortunately, there are no guidelines ... the University of Miami (UM) and at Northern Illinois University ...
... Levanger, Norway and Boulder, CO, USA -- April 10, ... a new collaboration to advance the clinical use of ... of biomarkers for the prediction of cardiovascular events such ... collaboration will analyze biological samples and clinical data from ...
Cached Biology News:Robotic cats, a kitten mummy and a major UK vet gathering 2Robotic cats, a kitten mummy and a major UK vet gathering 3Don't assume the sand is safe 2