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  • Title: Quantum Hall to insulator transition in the bilayer quantum Hall ferromagnet.
    Author: Murthy G, Sachdev S.
    Journal: Phys Rev Lett; 2008 Nov 28; 101(22):226801. PubMed ID: 19113502.
    Abstract:
    We describe a phase transition of the bilayer quantum Hall ferromagnet at nu=1. In the presence of static disorder (modeled by a periodic potential), bosonic S=1/2 spinons undergo a superfluid-insulator transition while preserving ferromagnetism. The Mott insulating phase has an emergent U(1) photon, and the transition is between Higgs and Coulomb phases of this photon. Consequences for charge and counterflow conductivity and for interlayer tunneling conductance are discussed.
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