Matthew Fisher

Mon, Nov 15, 2010, 1:15 pm to 6:00 pm
Jadwin 303
Title: Interlayer Coherent Composite Fermi Liquids in Quantum Hall Multilayers Abstract Composite Fermions have played a central role in the field of quantum Hall physics. Perhaps the most striking manifestation of composite Fermions is their formation of a Fermi sea at certain even denominator fillings, notably = 1/2. Here, we introduce an interlayer coherent composite Fermi liquid for = 1/2+1/2 bilayers, in which interlayer Coulomb repulsion drives exciton condensation of composite fermions. As a result, composite fermions propagate coherently between layers - even though electrons do no - and form bonding and antibonding Fermi seas. We will describe implications of this novel phase and generalizations to three-dimensional quantum Hall multilayers of potential relevance to high-field graphite. 1