Navigation Links
Study of electron orbits in multilayer graphene finds unexpected energy gaps
Date:8/10/2010

ergy and the local electron potential corresponding to the bowl but until now, the orbits hadn't been imaged directly."

Placed in a magnetic field, these orbits normally drift along lines of nearly constant electric potential. But when a graphene sample has small fluctuations in the potential, these "drift states" can become trapped at a hill or valley in the material that has closed constant potential contours. Such trapping of charge carriers is important for the quantum Hall effect, in which precisely quantized resistance results from charge conduction solely through the orbits that skip along the edges of the material.

The study focused on one particular electron orbit: a zero-energy orbit that is unique to graphene. Because electrons are matter waves, interference within a material affects how their energy relates to the velocity of the wave and reflected waves added to an incoming wave can combine to produce a slower composite wave. Electrons moving through the unique "chicken-wire" arrangement of carbon-carbon bonds in the graphene interfere in a way that leaves the wave velocity the same for all energy levels.

In addition to finding that energy states follow contours of constant electric potential, the researchers discovered specific areas on the graphene surface where the orbital energy of the electrons changes from one atom to the next. That creates an energy gap within isolated patches on the surface.

"By examining their distribution over the surface for different magnetic fields, we determined that the energy gap is due to a subtle interaction with the substrate, which consists of multilayer graphene grown on a silicon carbide wafer," First explained.

In multilayer epitaxial graphene, each layer's symmetrical sublattice is rotated slightly with respect to the next. In prior studies, researchers found that the rotations served to decouple the electronic properties of each graphene layer.


'/>"/>
Contact: John Toon
jtoon@gatech.edu
404-894-6986
Georgia Institute of Technology Research News
Source:Eurekalert  

Page: 1 2 3 4

Related biology technology :

1. Terrorist de-radicalization shows promise, comprehensive study finds
2. Vicept Therapeutics Announces Positive Clinical Study Results of V-101 for the Treatment of the Erythema of Rosacea
3. New Study Demonstrates Clinical Validity of EarlyCDT-Lung™
4. YM BioSciences announces conclusion of Phase I dose-escalation and expansion of ongoing CYT387 Phase I/II clinical study
5. Aeterna Zentaris Announces NIH Grant for a Phase 1/2 Study in Advanced Prostate Cancer with AEZS-108
6. DAIICHI SANKYO EUROPE GmbH Selects DATATRAK eClinical™ for Pan-European Systolic Hypertension Study
7. New England Journal of Medicine Publishes Data from Pivotal Phase 3 PROVENGE IMPACT Study
8. Angiotech Pharmaceuticals and partner Athersys announce positive results from phase I study of MultiStem(R) in heart attack patients
9. Aegera Therapeutics Reports Survival Data from the Phase 1 Portion of its Phase 1-2 Study of AEG35156 in Combination with Sorafenib in Patients with Advanced Hepatocellular Carcinoma
10. Study measures single-molecule machines in action
11. Recent Study Reports Reveals that HGH May Aid Performance
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Study of electron orbits in multilayer graphene finds unexpected energy gaps
(Date:3/4/2015)... 04, 2015 Proove Biosciences ... Medicine, is excited to announce the launch of ... Optimize the Management of Pain”. , The continuing ... for the next year. The focus of the ... recognize inadequate pain treatments, integrate appropriate pain management ...
(Date:3/4/2015)... , March 4, 2015  BioClinica®, ... and technology provider, today announced that clinical ... countries convened at its annual European User ... to discuss the use of its ... BioClinica,s eClinical technologies include: the Microsoft Office-Smart ...
(Date:3/4/2015)... Follow us on LinkedIn ... fastest growing technologies in the life sciences industry. Growing ... driving growth in nucleic acid detection technologies like qPCR ... expressions will continue to benefit the qPCR and dPCR ... from pharma, biotech, food & beverage to animal feed, ...
(Date:3/4/2015)... 2015 Lancée par ... en décembre 2011, l,étude collaborative française ... qui compare   l es microsphères en ... dans le carcinome hépatocellulaire avancé, a recruté plus ... avancé   ; les résultats sont attendus fin ...
Breaking Biology Technology:Proove Biosciences Launches CME Accredited Program with Medscape 2Proove Biosciences Launches CME Accredited Program with Medscape 3BioClinica Teams With Pharma To Tackle Clinical Trial Challenges In Europe 2BioClinica Teams With Pharma To Tackle Clinical Trial Challenges In Europe 3Focus on Quantifying Nucleic Acid Molecules Spurs Growth in the qPCR & dPCR Instrumentation Market, According to a New Report by Global Industry Analysts, Inc. 2Focus on Quantifying Nucleic Acid Molecules Spurs Growth in the qPCR & dPCR Instrumentation Market, According to a New Report by Global Industry Analysts, Inc. 3Focus on Quantifying Nucleic Acid Molecules Spurs Growth in the qPCR & dPCR Instrumentation Market, According to a New Report by Global Industry Analysts, Inc. 4Traitement du cancer primitif du foie : Recrutement terminé pour l'étude SARAH et résultats attendus fin 2016 2Traitement du cancer primitif du foie : Recrutement terminé pour l'étude SARAH et résultats attendus fin 2016 3Traitement du cancer primitif du foie : Recrutement terminé pour l'étude SARAH et résultats attendus fin 2016 4Traitement du cancer primitif du foie : Recrutement terminé pour l'étude SARAH et résultats attendus fin 2016 5Traitement du cancer primitif du foie : Recrutement terminé pour l'étude SARAH et résultats attendus fin 2016 6
... Increase needed to train workforce, stimulate economy ALEXANDRIA, Va., ... Fiscal Year 2010 budget request, proposing level funding for ... (Perkins Act) at $1.3 billion. The Perkins Act is ... education programs that connect education and real-world careers. The ...
... the world,s leading publishers of scientific, technical, and ... Michael Hansen,CEO of Elsevier,s Health Sciences Division, issued ... improper Australia based sponsored journal,publication practices between 2000 ... prides itself on operating its business in the ...
... May 7 The Sixth Annual Healthcare Unbound Conference ... (TCBI), will feature the coming together of consumer and ... The Conference will take place at the ... 2009. Attendees will include a diverse representation of ...
Cached Biology Technology:Obama Budget Level Funds Career Technical Education 2Obama Budget Level Funds Career Technical Education 3Statement From Michael Hansen, CEO of Elsevier's Health Sciences Division, Regarding Australia Based Sponsored Journal Practices Between 2000 and 2005 2Sixth Annual Healthcare Unbound Conference to Focus on Remote Monitoring, Home Telehealth & eHealth for Chronic Care Management & Wellness Promotion 2Sixth Annual Healthcare Unbound Conference to Focus on Remote Monitoring, Home Telehealth & eHealth for Chronic Care Management & Wellness Promotion 3
(Date:2/9/2015)...  Lintec of America recently announced an exclusive license ... macrostructures, including sheets, yarns and ribbons, developed at the ... the vast industrial resources of the global Lintec Group, ... of America is forming the Nano-Science and Technology Center ... on scaling up the manufacturing and commercialization of nano ...
(Date:2/5/2015)... Feb. 5, 2015  Marken is starting its 35 ... has launched a new marketing campaign to solidify its ... The new campaign focuses on First as ... shipments. The first headline in the series, ... priorities with its client,s priorities. Marken recognizes the need ...
(Date:2/5/2015)... Jan. 26, 2015 NXT-ID, Inc. (NASDAQ: ... biometric authentication company focused on the growing mobile commerce ... ( http://www.nxt-id.com/ ) as part of its 2015 marketing ... Company launched its new consumer website for Wocketwallet.com earlier ... CEO of NXT-ID said, "Our new corporate website naturally ...
Breaking Biology News(10 mins):Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 2Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 3Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 4Marken Launches New Patient-Centric Campaign 2NXT-ID, Inc. Launches New Corporate Website As Part Of Ongoing 2015 Branding Initiatives For Wocket Smart Wallet 2NXT-ID, Inc. Launches New Corporate Website As Part Of Ongoing 2015 Branding Initiatives For Wocket Smart Wallet 3
... , New research published today in BioMed Central,s open access ... plant Rafflesia cantleyi , with its 50cm diameter flowers, ... Analysis of these genes shows that their functions range from ... replaced the parasites own gene activity. Vertical gene transfer ...
... N.H. Communities of microbial organisms -- species such ... the Gulf of Mexico changed significantly following the Deepwater ... University of New Hampshire,s Hubbard Center for Genome Studies ... sediments from five Gulf Coast sites prior to and ...
... of Colorado Boulder looking for organisms that eke out a ... has found a hardy few. A new DNA analysis ... in South America has revealed a handful of bacteria, fungi ... a different way of converting energy than their cousins elsewhere ...
Cached Biology News:Parasitic plants 'steal' genes from their hosts 2Microbial communities shifted dramatically after Deepwater Horizon spill 2CU-Boulder-led team finds microbes in extreme environment on South American volcanoes 2CU-Boulder-led team finds microbes in extreme environment on South American volcanoes 3CU-Boulder-led team finds microbes in extreme environment on South American volcanoes 4