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Physics and Astronomy

Physics & Astronomy Colloquium

3:30 PM, Friday, April 9, 2010
Room 155, Chem-Phys Building

Dr. Aron Pinczuk
Department of Appl. Physics & Appl. Mathematics
Department of Physics
Columbia University

"Quantum Hall Phases `Seen' as Quantum Liquids''

Quantum Hall phases are archetypes of the remarkable many-electron states that emerge in electron fluids under conditions of greatly reduced dimensionality. Quantum Hall fluids support characteristic low-energy excitation modes that manifest underlying fundamental interactions.

Inelastic light scattering methods at very low temperatures are experimental venues to study low-lying excitations that take the fluids of electrons above the ground states. Of particular interest are the excitation modes that demonstrate novel quantum liquid behavior and that offer insights on unexpected collective responses.

This presentation considers inelastic light scattering studies of the low-lying excitations that are significant in the intriguing physics of quantum Hall fluids. The most recent results explore excitations of the quantum Hall fluids that reside in the second Landau level (at level filling factors such as n=5/2 and n=8/3). The quantum Hall fluids in higher Landau levels are of great current interest for applications in topologically protected quantum information processing.

Refreshments will be served in CP 179 at 3:15 PM