Glassy behavior in quantum Hall bilayers

H. A. Fertig, Joseph P. Straley

Research output: Contribution to journalConference articlepeer-review


Interlayer tunneling in quantum Hall bilayer systems is investigated via numerical simulations of the classical two dimensional XY model with a symmetry-breaking field. It is shown that sufficiently strong disorder induces strings of overturned spins and unpaired vortices to proliferate through the system. This string glass state supports low energy excitations which lead to anomalously large dissipation when a small tunneling is present, as observed in experiment. Strong interlayer tunneling currents can depin the strings and lead to nearly normal dissipation above a critical current. This depinning phenomenon also explains the behavior of experiments in parallel magnetic fields.

Original languageEnglish
Pages (from-to)48-51
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Issue number1-3
StatePublished - Apr 2004
Event15th International Conference on ELectronic Propreties - Nara, Japan
Duration: Jul 14 2003Jul 18 2003

Bibliographical note

Funding Information:
This work was supported by NSF Grant No. DMR-0108451. Computer time was provided by University of Kentucky through NCSA Grant No. DMR-020024.


  • Bilayer
  • Josephson tunneling
  • Langevin dynamics
  • Quantum Hall effect
  • XY model

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


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