Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
Email Facebook Twitter Google+ LinkedIn Comments

Dressing Particles Takes Time

Photonics Spectra
Mar 2002
Physicists have typically assumed that a free charged particle introduced into a nonequilibrium Coulomb system instantaneously becomes a "dressed" particle, completely integrated into the system. However, researchers from Technische Universität München in Garching, Germany, have observed a short delay, on the scale of 10-14 s.

They used a 10-fs pulse from a Ti:sapphire laser from Femtolasers Produktions GmbH in Vienna, Austria, to induce free electron-hole pairs in a GaAs film. A single-cycle 27-fs, 28-THz pulse generated via optical rectification of the Ti:sapphire pulse then probed the excited GaAs crystal. The changes induced in the probe's electric field amplitude revealed direct information about the many-body effects taking place to renormalize the system.

As reported in the Nov. 15 issue of Nature, the researchers discovered that the dressing occurs on a timescale comparable to the inverse plasma frequency. This information could benefit studies of superconductors, lattice dynamics in organic semiconductors and vibrational relaxation in large molecules.

Research & TechnologyTech Pulse

Terms & Conditions Privacy Policy About Us Contact Us
back to top
Facebook Twitter Instagram LinkedIn YouTube RSS
©2018 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA,

Photonics Media, Laurin Publishing
x Subscribe to Photonics Spectra magazine - FREE!
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.