Zou, Bo - University of Texas, Austin

Vortices and vortex lattices in the bilayer exciton superfluids in the quantum Hall regime

In bilayer systems doped with electrons and holes separately, interlayer excitons are formed by Coulomb attraction and condense in low temperatures. This superfluid phase persists in high magnetic fields and competes with the quantum Hall phase in each layer without inter-layer coherence. The vortex excitations have fractionalized electric charge and will form a honeycomb lattice in a small concentration when the electrons and holes are doped slightly imbalanced.