Spectroscopic determination of the order parameter of coupled bilayers at νT=1

Stefano Luin, Vittorio Pellegrini, Aron Pinczuk, Brian S. Dennis, Loren N. Pfeiffer, Ken W. West

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We report inelastic light scattering measurements of spin excitations on coupled electron bilayers with relatively large tunneling gaps at total filling factor νT = 1. We show that the pseudospin polarization order parameter, where the pseudospin labels the occupation of symmetric and antisymmetric levels, can be determined from the energy of long wavelength spin excitations. Our experiments indicate that the order parameter in the quantum Hall ground state collapses at the incompressible-compressible phase transition. The latter is driven by decreasing the tunneling gap through the application of an in-plane magnetic field.

Original languageEnglish (US)
Pages (from-to)244-247
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Issue number1-2
StatePublished - Aug 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


  • Coupled bilayers
  • Light scattering
  • Quantum Hall effect


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