Navigation Links
New study confirms exotic electric properties of graphene
Date:11/17/2009

have also succeeded in creating a close approximation to a two-dimensional electron gas by bonding two slightly different semiconductors together. Electrons are confined to the interface between the two and their motions are restrained to two dimensions. When such a system is cooled down to less than one degree above absolute zero and a strong magnetic field is applied, then the fractional quantum Hall effect appears.

Since scientists figured out how to make graphene five years ago, they have been trying to get it to exhibit this effect with only marginal success. According to Bolotin, the Columbia group figured out that interference from the surface the graphene was sitting on was the problem. So they applied semiconductor lithography techniques to suspend ultraclean graphene sheets between microscopic posts above the surface of semiconductor chips. When they cooled this configuration down within six degrees of absolute zero and applied a magnetic field, the graphene generated a robust quantum Hall effect as predicted by theory.

The best way to understand this counterintuitive effect is to think of the electrons in graphene as a forming a (very thin) sea of charge. When the magnetic field is applied, it generates whirlpools in the electron fluid. Because electrons carry a negative charge, these vortices have a positive charge. They form with fractional charges such as one-third, one-half and two-thirds that of an electron. These positive charge carriers are attracted to and attach to the conduction electrons, creating quasi-particles with fractional charges.

Understanding the electrical properties of graphene is important because, unlike the other materials used by the electronics industry, it remains stable and conductive down to the molecular scale. As a result, when the current silicon technology reaches it's a fundamental miniaturization limit in coming years, graphene could very well take its place.

Meanwhile, some theoreti
'/>"/>

Contact: David F. Salisbury
david.salisbury@vanderbilt.edu
615-343-6803
Vanderbilt University
Source:Eurekalert

Page: 1 2 3

Related biology technology :

1. NOVAVAX Completes First Stage of Enrollment in Pivotal H1N1 Influenza Vaccine Study in the Country of Mexico
2. Esperion Therapeutics Initiates Phase I Clinical Study for ETC-1002
3. DATATRAK Signs New Client for Rescue Study
4. Chinas Research Output More Than Doubled Since 2004, Thomson Reuters Study Reveals
5. Additional Data From Fidaxomicins Phase 3 Study for Clostridium Difficile Infection (CDI) Presented at IDSA Annual Meeting
6. French Physicians to Conduct 2000-Patient Study of CATANIA(TM) Coronary Stent
7. Global Phase III Study Results Show Eribulin Meets Primary Endpoint of Overall Survival
8. YM BIOSCIENCES REPORTS ADDITIONAL RESULTS FROM NIMOTUZUMAB PHASE III STUDY IN CHILDREN WITH GLIOMA PRESENTED BY ONCOSCIENCE AG
9. Penn study: Transforming nanowires into nano-tools using cation exchange reactions
10. Gamida Cell and Cellerix Partner on Feasibility Study
11. FluStop natural flu remedy sales increase 700% with confusion about new flu shot study and H1N1
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/30/2014)... (PRWEB) August 31, 2014 The ... a professional and in-depth study on the current ... Global and China. , The report provides a ... and industry chain structure. Global market analysis and ... focus on history, developments, trends and competitive landscape ...
(Date:8/29/2014)... According to a new market report published ... market was valued at USD 3,754.6 million in 2012 and ... 2019at a CAGR of 5.9% from 2013 to 2019. , ... is afflicted by bone and joint disorders, and this number ... has and will continue to increase the demand for orthobiologics. ...
(Date:8/29/2014)... (PRWEB) August 29, 2014 Three ... Energy's 2014 Hydrogen Production R&D Award ... by splitting water using sunlight. , Shared with ... and the University of Nevada, Las Vegas (UNLV), ... developing models of photoelectrochemical solar-hydrogen production and corrosion ...
(Date:8/28/2014)... SPIE Fellow Glenn Boreman, Professor and ... and Director of the Center for Optoelectronics and Optical ... and co-founder and Chairman of the Board of Plasmonics, ... Vice President of SPIE, the international society for optics ... recent election results at the Annual General Meeting of ...
Breaking Biology Technology:Electrical Insulating Varnish Market World, China Regional Analysis & 2020 Forecasts Available at DeepResearchReports.com 2Electrical Insulating Varnish Market World, China Regional Analysis & 2020 Forecasts Available at DeepResearchReports.com 3Global Orthobiologics Market to Reach $5,519.9 Million by 2019: Transparency Market Research 2Global Orthobiologics Market to Reach $5,519.9 Million by 2019: Transparency Market Research 3Livermore Team Awarded for Hydrogen Production Research 2Glenn Boreman, UNC Professor and Plasmonics Co-Founder, Elected to SPIE Presidential Chain 2
... deep underground carries no significant threat to human health, despite ... Researchers found that the risk of death from poisoning ... rocks is about one in 100 million far less ... from the University of Edinburgh studied historical data on deaths ...
... University-University of Oregon Center for Sustainable Materials Chemistry, born ... moving into a second phase under a new five-year, ... through its Centers of Chemical Innovation Program, will allow ... and development and boost efforts to translate basic-level discoveries ...
... The Albert and Mary Lasker Foundation, ... research, announced today the winners of the 2011 Lasker Awards ... Horwich for basic medical research, Tu Youyou for ... of Health for public service. The Lasker Awards – considered ...
Cached Biology Technology:Health fears over CO2 storage are unfounded, study shows 2Center for Sustainable Materials Chemistry gets Phase 2 NSF grant 2Center for Sustainable Materials Chemistry gets Phase 2 NSF grant 3Center for Sustainable Materials Chemistry gets Phase 2 NSF grant 42011 Lasker Awards Honor Medical Research Pioneers 22011 Lasker Awards Honor Medical Research Pioneers 32011 Lasker Awards Honor Medical Research Pioneers 42011 Lasker Awards Honor Medical Research Pioneers 52011 Lasker Awards Honor Medical Research Pioneers 62011 Lasker Awards Honor Medical Research Pioneers 7
(Date:9/2/2014)... DURHAM, N.C. -- When you accidentally touch a hot ... know the basic neural circuits involved in sensing and ... out the molecular players. , Duke researchers have made ... molecule involved in pain in worms, and have built ... Sept. 2 in Nature Communications , may help ...
(Date:9/1/2014)... quality in the U.S. has improved steadily in recent ... overall dietary quality remains poor and disparities continue to ... new study from Harvard School of Public Health (HSPH). ... date that the extensive efforts by many groups and ... payoff, but it also indicates that these efforts need ...
(Date:9/1/2014)... minutes after birth, every child in the U.S. undergoes ... of conditions, including sickle cell disease. Thousands of children ... meaning many suffer and die from the disease each ... halt to at least some of those deaths. ... working in the lab of George Whitesides, the Woodford ...
Breaking Biology News(10 mins):Surprising new role for calcium in sensing pain 2Surprising new role for calcium in sensing pain 3Quality of US diet shows modest improvement, but overall remains poor 2Quality of US diet shows modest improvement, but overall remains poor 3Faster, cheaper tests for sickle cell 2Faster, cheaper tests for sickle cell 3
... created to provide a haven for both protected species ... Gothenburg have analysed species living on the seabed (benthic ... marine areas require special protection., , "It,s not possible ... park. That,s why I,ve done what experienced mushroom pickers ...
... This release is available in German . ... the carbohydrates they produce through photosynthesis in the leaves. However, ... heart to help transport this vital fuel. Instead, they use ... with colleagues from the Carnegie Institution for Science in California, ...
... of 34 institutions in 15 countries contributing to the measurements ... network, InGOS. , The network focuses on providing accurate information ... for a more vigorous climate action. In order to ... of greenhouse gas emissions is essential and not only ...
Cached Biology News:Life on Kosterhavet's seabed analyzed 2Sugar pump in plants identified 2Sugar pump in plants identified 3DTU is participating in a European network on measurement of greenhouse gases 2
... SYBR Green II RNA gel ... gel stain that has bright fluorescence when ... gels, making it ideal for use with ... scanners or standard UV transilluminators. A 500 ...
... records analyzes and reports the data from any ... the a chart recorder. The final data is ... The end-point selection is automatic for Systolic, Mean, ... computed. The user is always in the position ...
... is taking automated patch clamping to a new ... to generate thousands of high quality data points ... in ion channel drug discovery and safety testing. ... afforded by conventional patch clamping can now be ...
... Reagents for the differentiation of mouse ... cell bodies exist in the midbrain, where ... nigra, the ventral tegmental area, and the ... rise to extensive forebrain dopamine innervation ( ...
Biology Products: