Tel Aviv University

Tel Aviv University
Condensed Matter Theory Seminar

Academic Year  2003 - 2004

The seminar is held in Room 204 in the Shenkar Physics Building, every Monday at 16:00


November 10, 2003

"Phason Dynamics in Aperiodic Crystals"

Prof. Ted Janssen
Institute for Theoretical Physics, University of Nijmegen, The Netherlands

     Crystals without periodicity are commonly found, but they are less known than periodic crystals. They share many properties with each other, but the behaviour of electrons and phonons in aperiodic crystals has a richer structure.

In particular, there is a typical dynamic behaviour associated to the fact that these materials may be seen as periodic structures in a higher-dimensional space. The additional dimensions make it possible to find extra hydrodynamic modes under certain conditions. These modes have a low frequency. The question will be discussed whether these low frequency modes remain when the amplitudes become large.

Under certain conditions, to be discussed here, low frequency or low friction modes are still present. These waves are a type of solitary waves. Their properties will be discussed for a number of classes of aperiodic crystals. It makes it possible to obtain unlubricated almost frictionless motion.  

Host: Dr. Ron Lifshitz, x5145
Fall 2003 Schedule Spring 2004 Schedule

For more information or for directions to 204 Shenkar please contact: Chava Belson  03-6408300

To suggest potential speakers or register feedback contact:  Ron Lifshitz  03-6405145

Sponsored by:   The Condensed Matter Physics Department, The School of Physics & Astronomy, Tel Aviv University.