Events at Physics |
Events During the Week of July 28th through August 4th, 2013
Monday, July 29th, 2013
- No events scheduled
Tuesday, July 30th, 2013
- No events scheduled
Wednesday, July 31st, 2013
- No events scheduled
Thursday, August 1st, 2013
- R. G. Herb Condensed Matter Seminar
- Subthreshold behavior and avalanches in an exactly solvable charge density wave system
- Time: 10:00 am
- Place: 5310 Chamberlin
- Speaker: Muhittin Mungan, Bogazici University, Istanbul
- Abstract: We present a toy charge density wave (CDW) model in 1d exhibiting a depinning transition with threshold force and configurations that can be worked out explicitly. Due to the periodic boundary conditions imposed, the threshold configuration has a set of topological defects whose location and number depend on the realization of the random phases. Approaching threshold, these defects are relocated by avalanches whose size dependence on the external driving force is described by a record-breaking process. We find that the depinning transition in this model is a critical phenomenon, The exact avalanche size distributions and their dependence on the external force are obtained. Remarkably, the scaling exponents associated with the critical behavior depend on (1) the initial conditions and (2) the relationship between the system size and the pinning strength. This is joint work with David C. Kaspar, UC Berkeley.
- Host: Coppersmith
Friday, August 2nd, 2013
- No events scheduled