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Thursday, November 15, 2012
1:00 PM - 2:00 PM
CNLS Conference Room (TA-3, Bldg 1690)

Student Seminar

Tailoring Complex Pattern Formation on Simple Substrates for Materials Science Applications

Danielle McDermott
Department of Physics, University of Notre Dame

We examine pattern formation of colloids atop a square periodic substrate using large scale numerical simulations. The pins forming the substrate are modeled with a muffin-tin potential which is flat with localized traps. We show that with 4 colloids per pinning site the system has triangular ordering and with 5 colloids per site it has square ordering. We study intermediate fillings and identify a rich variety of distinct ordering regimes including disordered grain boundaries, crystalline stripe structures, superlattice orderings, and disordered patches of multiple phases. We also apply a drive to the system, and show that several dynamically ordered states arise. Our results show that periodic substrates of muffin-tin potentials can be used to tailor grain boundary formation.

Host: Cynthia Reichhardt, T-1, 665-1134