Physics Colloquium

"The nature of the composite fermion in quantum Hall liquids"

Presented by Dam Thanh Son, University of Chicago

Tuesday, April 19, 2016, 3:30 pm — Large Seminar Room, Bldg. 510

The quantum Hall liquids are some of the most nontrivial strongly interacting states of matter. Experiments have established the existence of the composite fermion as an effective degree of freedom of quantum Hall systems near half filling. A long-standing problem of existing theories of the composite fermion is the lack of particle-hole symmetry of the lowest Landau level. I will describe how the particle-hole symmetry took a central role in recent theoretical discussions of the fractional quantum Hall effect; in particular, how a recent synthesis, motivated by the physics of graphene and topological insulators, has lead to a new understanding of the low-energy quasiparticle of the half-filled Landau level. According to the new picture, the composite fermion is a Dirac particle, with a gauge but non-Chern-Simons interaction. Distinctive consequences of the new proposal are outlined.

Hosted by: Robert Pisarski

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