Héctor Manuel López de la Cerda Ríos (email): is a fourth year graduate student in Materials Science and Engineering at Northwestern University, studying in the group of Monica Olvera de la Cruz. He is interested in active matter due to its macroscopic dimensions and reconfigurability as a function of external fields within timescales of only seconds to minutes. These materials have the potential to adapt to their external environment thus eliciting life-like behavior in inanimate matter, which may accelerate the advancement of autonomous machines (similar to what cybernetics was intended to accomplish). Before coming to Northwestern, he studied materials science and chemical engineering at the Universidad Nacional Autónoma de México. When he is not working on his academic projects, he likes to go to the Green Mill to listen to jazz, analyze cultural divides, ponder about science and that which we cannot comprehend (largely inspired by science fiction by Stanislaw Lem), watch classic movies, and play the harmonica.

Talk details: Metallization of colloidal crystals
Size asymmetric binary colloidal crystals with structures analogous to ionic atomic crystals undergo a transition where the smaller component delocalizes as the temperature increases, generating "metallic" colloidal crystals. The small particles roam among the large particles holding together the lattice, as electrons do in metals. In this talk, I will describe the nature of this localized-delocalized sublattice transition in size asymmetric colloidal mixtures and make analogies with an insulator-metal transition that is largely driven by phonons of different crystal phases.