2012 Fall Graduate Colloquium Series: Kenneth Call/Ashleigh Chambers

DateSeptember 28, 2012Time3:35 - 5:00 pm
LocationBaylor Sciences Building, Room E.125
Description
Kenneth Call

The Fractional Quantum Hall Effect and the Possibility of Non-Abelian Statistics

Extending the familiar Hall Effect, the Quantum Hall Effect is observed in 2-dimensional systems and strong magnetic fields where the limited dimensions cause highly degenerate Landau levels to form. The Fractional Quantum Hall effect is observed when electron interactions are significant enough that additional quasiparticle states become available. Tiemann et al. have reported measurements of the n = 5/2 Fractional Quantum Hall State, that is consistent with a proposed wave function that follows non-abelian statistics. Such a system is a perquisite for constructing a topological quantum computer.

Ashleigh Chambers Walking on Water: The Effect of Compression on Non-Newtonian Fluids

The phenomenon of running on a cornstarch- water mixture, paint thinning once spread onto the wall, or gravy thickening while stirred quickly have long baffled the everyday observer and scientists alike. Theories suggest such observations are due to shear thickening, the friction associated with layers of a mixture sliding past one another. However, a new study, conducted by Waitukeitia and Jaeger, suggests that this change in viscosity can be explained by the process of compression in which a dense suspension is subjected to a sudden persistent force. The results of this study prove interesting results, which could eventually lead to transformations in both personal defense and hydraulics.

For more information contact: Dr. Linda Olafsen 254-710-2541

PublisherDepartment of Physics
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