Deconfinement and Dissipation in Quantum Hall "Josephson" Tunneling

Details Deconfinement and Dissipation in Quantum Hall "Josephson" Tunneling Deconfinement and Dissipation in Quantum Hall "Josephson" Tunneling

2003-01-09

arxiv.org/abs/cond-mat/0301128v2

Physical Review Letters 91, 046806 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures. Published version. Animations available at http://www.pa.uky.edu/~fertig/stringglass

Scientific paper

10.1103/PhysRevLett.91.046806

The zero-bias tunneling resonance in quantum Hall bilayer systems is investigated via numerical simulations of the classical two dimensional XY model with a symmetry-breaking field. Disorder is included in the model, and is shown to nucleate strings of overturned spins proliferated through the system, with unpaired vortices and antivortices at their endpoints. This string glass state supports low energy excitations which lead to anomalously large dissipation in tunneling, as observed in experiment. The effect of an in-plane magnetic field is discussed.

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