Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Light, sound, action: The plasmonic promise of graphene

The new graphene band picture indicates how strongly plasmons couple to the charge carriers in graphene.
The new graphene band picture indicates how strongly plasmons couple to the charge carriers in graphene.

Abstract:
Scientists working at the Advanced Light Source (ALS) at DOE's Lawrence Berkeley National Laboratory have discovered striking new details about the electronic structure of graphene, crystalline sheets of carbon just one atom thick. An international team led by Aaron Bostwick and Eli Rotenberg of the ALS found that composite particles called plasmarons play a vital role in determining graphene's properties.

Light, sound, action: The plasmonic promise of graphene

Livermore, CA | Posted on July 7th, 2010

"The interesting properties of graphene are all collective phenomena," says Rotenberg, an ALS senior staff scientist responsible for the scientific program at ALS beamline 7, where the work was performed. "Graphene's true electronic structure can't be understood without understanding the many complex interactions of electrons with other particles."

The electric charge carriers in graphene are negative electrons and positive holes, which in turn are affected by plasmons—density oscillations that move like sound waves through the "liquid" of all the electrons in the material. A plasmaron is a composite particle, a charge carrier coupled with a plasmon.

"Although plasmarons were proposed theoretically in the late 1960s, and indirect evidence of them has been found, our work is the first observation of their distinct energy bands in graphene, or indeed in any material," Rotenberg says.

The most striking feature of the recent research is a new band picture for graphene, revealing that the energy bands of graphene cross at three places, not one. The bare-electron picture of graphene shows two conical bands that meet at a single point. But another pair of conical bands, the plasmaron bands, meets at a second, lower Dirac crossing. Between these crossings lies a ring where the hole and plasmaron bands cross.

Understanding the relationships among these three kinds of particles—charge carriers, plasmons, and plasmarons—may hasten the day when graphene can be used for "plasmonics" to build ultrafast computers—perhaps even room-temperature quantum computers—plus a wide range of other tools and applications.

####

For more information, please click here

Contacts:
Dan Krotz
510.486.4019

Copyright © Lawrence Berkeley National Laboratory

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Scientists join forces to reveal the mass and shape of single molecules April 27th, 2015

The 16th Trends in Nanotechnology International Conference (TNT 2015) unveils 25 Keynote Speakers: Call for abstracts open April 27th, 2015

Graphenea celebrates fifth anniversary April 27th, 2015

Sensor Designed in Iran Able to Remove Formaldehyde Gas from Environment April 27th, 2015

Physics

Pseudoparticles travel through photoactive material: KIT scientists measure important process in the conversion of light energy -- publication in Nature Communications April 24th, 2015

Electron spin brings order to high entropy alloys April 23rd, 2015

Surface matters: Huge reduction of heat conduction observed in flat silicon channels April 23rd, 2015

Quantum 'paparazzi' film photons in the act of pairing up April 22nd, 2015

Possible Futures

Printing Silicon on Paper, with Lasers April 21st, 2015

A glass fiber that brings light to a standstill: By coupling photons to atoms, light in a glass fiber can be slowed down to the speed of an express train; for a short while it can even be brought to a complete stop April 9th, 2015

Nanotechnology in Medical Devices Market is expected to reach $8.5 Billion by 2019 March 25th, 2015

Nanotechnology Enabled Drug Delivery to Influence Future Diagnosis and Treatments of Diseases March 21st, 2015

Nanotubes/Buckyballs/Fullerenes

SouthWest NanoTechnologies CEO Dave Arthur to Speak at NanoBCA DC Roundtable on May 19 in Washington DC April 20th, 2015

How to maximize the superconducting critical temperature in a molecular superconductor: International team led by Tohoku University opens new route for discovering high Tc superconductors April 19th, 2015

Nanotubes with two walls have singular qualities: Rice University lab calculates unique electronic qualities of double-walled carbon nanotubes April 16th, 2015

MIT sensor detects spoiled meat: Tiny device could be incorporated into 'smart packaging' to improve food safety April 15th, 2015

Quantum Computing

NIST tightens the bounds on the quantum information 'speed limit' April 13th, 2015

Electrical control of quantum bits in silicon paves the way to large quantum computers: Breakthrough by Australian-led team should make the construction of large-scale quantum computers more affordable April 11th, 2015

OU physicists first to create new molecule with record-setting dipole moment April 4th, 2015

Quantum teleportation on a chip: A significant step towards ultra-high speed quantum computers April 1st, 2015

Nanoelectronics

Surface matters: Huge reduction of heat conduction observed in flat silicon channels April 23rd, 2015

New class of 3D-printed aerogels improve energy storage April 22nd, 2015

‘Oxford Instruments Young Nanoscientist India Award 2015’ to Prof. Arindam Ghosh April 20th, 2015

Advances in molecular electronics: Lights on -- molecule on: Researchers from Dresden and Konstanz succeed in light-controlled molecule switching April 20th, 2015

Discoveries

Scientists join forces to reveal the mass and shape of single molecules April 27th, 2015

Sensor Designed in Iran Able to Remove Formaldehyde Gas from Environment April 27th, 2015

Cacao Seed Extract Used in Production of Catalytic Nanoparticles April 27th, 2015

Heat makes electrons’ spin in magnetic superconductors April 26th, 2015

Announcements

Scientists join forces to reveal the mass and shape of single molecules April 27th, 2015

The 16th Trends in Nanotechnology International Conference (TNT 2015) unveils 25 Keynote Speakers: Call for abstracts open April 27th, 2015

Graphenea celebrates fifth anniversary April 27th, 2015

Sensor Designed in Iran Able to Remove Formaldehyde Gas from Environment April 27th, 2015

Research partnerships

Heat makes electrons’ spin in magnetic superconductors April 26th, 2015

Pseudoparticles travel through photoactive material: KIT scientists measure important process in the conversion of light energy -- publication in Nature Communications April 24th, 2015

Electron spin brings order to high entropy alloys April 23rd, 2015

Surface matters: Huge reduction of heat conduction observed in flat silicon channels April 23rd, 2015

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project