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Physics and Astronomy

Physics & Astronomy Colloquium

3:30 PM, Friday, September 10, 2010
Room 155, Chem-Phys Building

Dr. Jainendra K. Jain
Department of Physics
Pennsylvania State University

From fermions to composite fermions to majorana composite fermions
When electrons confined in two dimensions are exposed to a strong magnetic field, they form a quantum liquid with bizarre properties. This liquid is distinct from superconductors or superfluids in that it does not involve any Bose-Einstein condensation but rather topological order. Its physics involves formation of particles called composite fermions, which are bound states of electrons and quantized vortices. The topological character of composite fermions exhibits through numerous exotic phenomena, most spectacularly through the phenomenon of the fractional quantum Hall effect. In addition to presenting an introduction to the nature and properties of composite fermions, I will present certain recent developments on a "superconducting" state of composite fermions, which may support quasiparticles that are called majorana composite fermions. These, in turn, obey nonabelian braid statistics and may prove useful for topological quantum computation.

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