Quantum Hall to Insulator Transition in the Bilayer Quantum Hall Ferromagnet

Details Quantum Hall to Insulator Transition in the Bilayer Quantum Hall Ferromagnet Quantum Hall to Insulator Transition in the Bilayer Quantum Hall Ferromagnet

2008-08-27

arxiv.org/abs/0808.3702v1

Physical Review Letters 101, 226801 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, no figures

Scientific paper

10.1103/PhysRevLett.101.226801

We describe a new phase transition of the bilayer quantum Hall ferromagnet at filling fraction $\nu = 1$. In the presence of static disorder (modeled by a periodic potential), bosonic $S=1/2$ spinons can undergo a superfluid-insulator transition while preserving the ferromagnetic order. The Mott insulating phase has an emergent U(1) photon, and the transition is between Higgs and Coulomb phases of this photon. Physical consequences for charge and counterflow conductivity, and for interlayer tunneling conductance in the presence of quenched disorder are discussed.

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