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:8/29/2014)... A major challenge before new biotechnology ... realm of Boston-Cambridge, is gaining visibility that can lead ... the Director of Boston’s Adult Stem Cell Technology Center, ... visibility of his company an important priority since he ... to a social media marketing campaign launched ...
(Date:8/28/2014)... City, CA (PRWEB) August 28, 2014 ... sanitation products for the food processing industry, is asking ... a side-by side comparison of the E2 soap they’re ... E2 Sanitizing Foam Soap . Hand hygiene is ... in the food processing environment. Six key criteria are ...
(Date:8/28/2014)... A new research platform uses a laser ... structures undergoing stress and heating, an approach ... for microelectronics and batteries., This new technique, ... how heating and the surface stress of ... have discussed the merits of surface-stress influence ...
(Date:8/28/2014)... 28, 2014 The ability for organizations ... that will allow individuals to perform at the highest ... for employers looking to compete in this post–recession era. ... this trend, as the sector increasingly focuses on the ... which will have real results on the organization's development ...
Breaking Biology Technology:The Adult Stem Cell Technology Center, LLC Participates in Multiple Stem Cell and Regenerative Medicine Conferences Before Year End 2The Adult Stem Cell Technology Center, LLC Participates in Multiple Stem Cell and Regenerative Medicine Conferences Before Year End 3The Adult Stem Cell Technology Center, LLC Participates in Multiple Stem Cell and Regenerative Medicine Conferences Before Year End 4Best Sanitizers, Inc. Asks Food Industry Professionals: With Fall Harvest On the Way, Is Your E2 Hand Soap Up to the Task? 2New analytical technology reveals 'nanomechanical' surface traits 2New analytical technology reveals 'nanomechanical' surface traits 3Klein Hersh International Leads Philadelphia Area Life Science Industry in Company Culture 2Klein Hersh International Leads Philadelphia Area Life Science Industry in Company Culture 3
... N.Y., April 9, 2008 Genetic Engineering,and Biotechnology ... podcast,with Robert Langer, Ph.D., on New Polymeric Drug ... EDT, Dr. Langer is institute professor, chemical ... is the foremost,pioneer and innovator in modern drug ...
... for Targeted Cancer Drugs ... -, HOPKINTON, Mass., April 9, 2008 ... announced a partnership with Horizon,Discovery Ltd. (Cambridge, UK) ... cell line and screening capabilities for testing,single drugs ...
... Continues to Fortify Position in Emerging RNAi ... Interfering RNA (siRNA) Structural IP, PALO ... Corporation,a leading developer of targeted, systemic RNA ... licensed key intellectual,property (IP) covering certain efficacy-enhancing ...
Cached Biology Technology:Genetic Engineering and Biotechnology News (GEN) Presents Exclusive Podcast with Robert Langer, Ph.D. on New Polymeric Drug Delivery Systems 2Caliper Life Sciences Forms Alliance With Horizon Discovery to Provide Enhanced Solutions for Cancer Research Based on Isogenic Cell Lines 2Caliper Life Sciences Forms Alliance With Horizon Discovery to Provide Enhanced Solutions for Cancer Research Based on Isogenic Cell Lines 3Intradigm Licenses Key Next Generation RNA Interference (RNAi) Intellectual Property From University of Massachusetts Medical School 2Intradigm Licenses Key Next Generation RNA Interference (RNAi) Intellectual Property From University of Massachusetts Medical School 3Intradigm Licenses Key Next Generation RNA Interference (RNAi) Intellectual Property From University of Massachusetts Medical School 4
(Date:9/1/2014)... every child in the U.S. undergoes a battery of ... sickle cell disease. Thousands of children born in the ... and die from the disease each year. , ... least some of those deaths. , A Post-Doctoral ... lab of George Whitesides, the Woodford L. and Ann ...
(Date:9/1/2014)... basic building block of DNAcould initiate fragile X syndrome, the most ... The Journal of Cell Biology . , ... on the X chromosome called fragile X mental retardation 1 ... men carry a so-called premutation, in which a series of DNA ... slightly longer than normal. These repeats are prone to even further ...
(Date:9/1/2014)... life without light. They emit echolocation sounds and use the ... or prey. In their brains, they have a spatial map ... at Technische Universitt Mnchen (TUM) has shown for the first ... , Closer objects appear larger , When ... number of activated neurons in its brain increases. As a ...
Breaking Biology News(10 mins):Faster, cheaper tests for sickle cell 2Faster, cheaper tests for sickle cell 3A nucleotide change could initiate fragile X syndrome 2Zooming in for a safe flight 2
... in the Ohio State University Comprehensive Cancer Center say ... cause cancer in mice. The discovery offers new insight ... lymphoma and at the same time underscores the powerful ... in cell signaling pathways active in carcinogenesis. , ...
... year, East Coast fever destroys the small farmer's dream of ... and costing some $200 million annually, this tick-borne disease rages ... an international team of scientists has taken the first major ... work, published in the February 13-17 early online edition of ...
... have identified the job of one of the most ... scientists because it is present in nearly every organism, ... yet, in laboratory experiments, its function has remained a ... enzyme known as DinB DNA polymerase is specialized for ...
Cached Biology News:Single microRNA causes cancer in transgenic mouse 2Single microRNA causes cancer in transgenic mouse 3Genomics-based vaccine could prevent deadly cattle disease 2Genomics-based vaccine could prevent deadly cattle disease 3Common enzyme is a key player in DNA repair 2Common enzyme is a key player in DNA repair 3
... Vector NTI Advance 9.1 ... and highly integrated application ... and molecular biology data ... readily available for export. ...
...
Borosilicate Glass. Certified for use with the Beacon 2000 Systems, 1,000 tubes/case...
Standard 2" and 3" Fiberboard Boxes can be sold separately or with 16, 25, 36, 49, 64, 81 or 100 cell dividers. Fiberboard boxes can also be ordered with corresponding freezer racks...
Biology Products: