Japanese  
  Home  |  Top News  |  Most Popular  |  Video  |  Multimedia  |  News Feeds  |  Feedback
  Medicine  |  Nature & Earth  |  Biology  |  Technology & Engineering  |  Space & Planetary  |  Psychology  |  Physics & Chemistry  |  Economics  |  Archaeology
Top > Chemistry > Controlling Quantum Tunneling with Light… >
Controlling Quantum Tunneling with Light

Published: April 5, 2012.
By University of Cambridge
http://www.cam.ac.uk

Scientists at the Cavendish Laboratory in Cambridge have used light to help push electrons through a classically impenetrable barrier. While quantum tunnelling is at the heart of the peculiar wave nature of particles, this is the first time that it has been controlled by light. Their research is published today, 05 April, in the journal Science.

Particles cannot normally pass through walls, but if they are small enough quantum mechanics says that it can happen. This occurs during the production of radioactive decay and in many chemical reactions as well as in scanning tunnelling microscopes.

According to team leader, Professor Jeremy Baumberg, "the trick to telling electrons how to pass through walls, is to now marry them with light".

This marriage is fated because the light is in the form of cavity photons, packets of light trapped to bounce back and forth between mirrors which sandwich the electrons oscillating through their wall.

Research scientist Peter Cristofolini added: "The offspring of this marriage are actually new indivisible particles, made of both light and matter, which disappear through the slab-like walls of semiconductor at will."

One of the features of these new particles, which the team christened 'dipolaritons', is that they are stretched out in a specific direction rather like a bar magnet. And just like magnets, they feel extremely strong forces between each other.

Such strongly interacting particles are behind a whole slew of recent interest from semiconductor physicists who are trying to make condensates, the equivalent of superconductors and superfluids that travel without loss, in semiconductors.

Being in two places at once, these new electronic particles hold the promise of transferring ideas from atomic physics into practical devices, using quantum mechanics visible to the eye.




Show Reference »


Translate this page: Chinese French German Italian Japanese Korean Portuguese Russian Spanish


 
All comments are reviewed before being posted. We cannot accept messages that refer a product, or web site.If you are looking for a response to a question please use our another feedback page.
Related »

Affinity 
9/24/12 
Florida State University Chemist May Hold Key to Building a Better Toxin Mousetrap
By Florida State University
TALLAHASSEE, Fla. — A Florida State University chemist's work could lead to big improvements in our ability to detect and eliminate specific toxins in our environment. Featured on …
Atom 
10/8/10 
★★★ 
Researchers Discover a New Class of Highly Electronegative Chemical Species
By Virginia Commonwealth University
RICHMOND, Va. (Oct. 8, 2010) – An international team of researchers has discovered a new class of highly electronegative chemical species called hyperhalogens, which use superhalogens as building blocks …
Light 
11/21/11 
UGA Scientists Invent Long-lasting, Near Infrared-emitting Material
By University of Georgia
Materials that emit visible light after being exposed to sunlight are commonplace and can be found in everything from emergency signage to glow-in-the-dark stickers. But until now, scientists have …
Data 
5/4/12 
New Technique Uses Electrons to Map Nanoparticle Atomic Structures
By Brookhaven National Laboratory
UPTON, NY — With dimensions measuring billionths of a meter, nanoparticles are way too small to see with the naked eye. Yet it is becoming possible for today's scientists …
More » 
 
ScienceNewsline  |  About  |  Privacy Policy  |  Feedback  |  Mobile  |  Japanese Edition
The selection and placement of stories are determined automatically by a computer program. All contents are copyright of their owners except U.S. Government works. U.S. Government works are assumed to be in the public domain unless otherwise noted. Everything else copyright ScienceNewsline.