Signatures of composite-fermion metals in electron bilayers at νT=1

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

Research output: Contribution to journalArticlepeer-review


Composite-fermion metals occur in the quantum Hall bilayers at total Landau level filling fraction νT=1 as the tunneling gap ΔSAS collapses by application of in-plane magnetic fields. Experimental evidence is obtained from the observation of a spin continuum below the Zeeman energy by resonant inelastic light scattering. These low-lying spin modes are assigned to quasi-particle excitations, where spin and composite-fermion Landau level index change simultaneously.

Original languageEnglish (US)
Pages (from-to)1312-1314
Number of pages3
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Issue number5
StatePublished - Mar 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


  • Composite-fermion metal
  • Inelastic light scattering
  • Phase transition
  • Quantum Hall bilayers


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