Lab Home | Phone | Search
Center for Nonlinear Studies  Center for Nonlinear Studies
 Colloquia Archive 
 Postdoc Seminars Archive 
 Quantum Lunch 
 Quantum Lunch Archive 
 CMS Colloquia 
 Q-Mat Seminars 
 Q-Mat Seminars Archive 
 P/T Colloquia 
 Kac Lectures 
 Kac Fellows 
 Dist. Quant. Lecture 
 Ulam Scholar 
 CNLS Fellowship Application 
 Student Program 
 Past Visitors 
 History of CNLS 
 Maps, Directions 
 CNLS Office 
Wednesday, July 08, 2009
2:00 PM - 3:00 PM
CNLS Conference Room (TA-3, Bldg 1690)


Realizing Novel Collective Particle Dynamics on Periodic Substrates: From Superconductors to Bacteria

Charles Reichhardt

I present an overview of different types of novel collective dynamical systems that can be realized in systems of collectively interacting particles in the presence of an ordered substrate. For superconducting vortices, we find that interesting gating and jamming phenomena can occur for periodic pinning arrays coexisting with channel geometries and crossed dc drives. Colloidal particles interacting with periodic optical trap arrays can exhibit both a polarized switching effect similar to liquid crystals and a martensitic switching where the system can change its global symmetry. Finally, I show that asymmetric periodic substrates can be used to create a ratchet effect in swimming bacteria, making it possible to create topotaxis systems and opening a new avenue for creating dynamical nanostructures.