Interlayer coherent composite Fermi liquid phase in quantum Hall bilayers.
We introduce an interlayer coherent composite Fermi liquid for nu = 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 not--and form bonding and antibonding Fermi seas. This phase is compressible with respect to symmetric currents but quantum Hall-like in the counterflow channel. Quantum oscillations of the composite Fermi seas generate a new series of incompressible states at nu = p/[2(p +/- 1)] per layer (p an integer), which is a bilayer analogue of Jain's sequence.
Alicea
Jason
J
Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.
Motrunich
Olexei I
OI
Refael
G
G
Fisher
Matthew P A
MP