Abstract
We study the quantum phase transitions and coherent tunneling in bilayer ultracold bosonic atoms with dipolar interactions at total filling factor ν T = 1/2. We demonstrate that, due to the unique characters of the dipole interactions, the ground state of the system may undergo paired quantum Hall state (PQH), dimer quantum-Hall state (DQH), and super-counter-fluidity phase (SCF) by tuning the dipole strength. The SCF state which breaks the easy-plane U(1) symmetry is of particular interest because it can exhibit interlayer coherent tuneling in the incompressible quantum-Hall (QH) state. We suggest that this coherent tunneling current could be observed directly in future experiments.
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Ji, A.C., Sun, Q., Hu, X.H. et al. Quantum phase transitions and coherent tunneling in a bilayer of ultracold atoms with dipole interactions. Eur. Phys. J. B 85, 194 (2012). https://doi.org/10.1140/epjb/e2012-30151-x
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DOI: https://doi.org/10.1140/epjb/e2012-30151-x