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# Title:Quantum Hall to Insulator Transition in the Bilayer Quantum Hall Ferromagnet

Abstract: We describe a new phase transition of the bilayer quantum Hall ferromagnet at filling fraction $ν= 1$. 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.
 Comments: 4 pages, no figures Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Journal reference: Physical Review Letters 101, 226801 (2008) DOI: 10.1103/PhysRevLett.101.226801 Cite as: arXiv:0808.3702 [cond-mat.mes-hall] (or arXiv:0808.3702v1 [cond-mat.mes-hall] for this version)

## Submission history

From: Ganpathy Murthy [view email]
[v1] Wed, 27 Aug 2008 13:23:20 UTC (11 KB)
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