MSE Seminar - Dr. Uzi Landman, Georgia Tech
Small is Different: Computational Microscopy and Emergence in the Nanoscale
Finite materials systems of reduced sizes exhibit specific forms of aggregation, phases, structures and morphologies, quantized electronic shell structures, dimensionality cross-over, and size-dependent evolutionary patterns, which are manifested in unique, nonscalable, size-dependent physical and chemical properties. Indeed, when the dimensions of materials structures are reduced to the nanoscale, emergent phenomena often occurs, that are not commonly expected, or deduced, from knowledge gained at larger sizes. Discovery, characterization, understanding and possible utilization of such emergent behavior of materials in the nanoscale are among the major challenges of modern materials science. Computer-based classical and quantum computations and simulations are tools of discovery of nanoscale emergent behavior . In this talk we discuss these issues, address some of the basic origins that underlie the unique behavior of material in the nanoscale, and highlight computational microscopy investigations of nanoscale phenomena in diverse systems, ranging from hydrodynamics of liquid nanojunctions and nanojets, shape-transitions of nanodroplets, the stability and mechanics of nanocrystals and their superlattice assemblies, nanocatalysis by free and surface-supported clusters, and the emergence of highly-correlated molecular structures made of electrons confined in semiconductor quantum dots, as well as formed by optically-trapped ultracold fermionc atoms.
 U. Landman, “Materials by Numbers”, Proc. Nat. Acad. Sci. (USA) 102, 6671 (2005).
* Supported by the Office of Basic Energy Sciences of the US Department of Energy and the Air Force Office of Scientific Research