Absorption spectroscopy in electron double layers: Evidence for broken symmetry states

M. J. Manfra*, B. B. Goldberg, J. C. Pniower, A. Pinczuk, V. Pellegrini, L. N. Pfeiffer, K. W. West

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations


Optical absorption spectroscopy has been used to explore the phase diagram of the double layer electron system at v = 1. Absorption spectroscopy is shown to be sensitive to the evolution of the electron system from a regime in which a gap in the single-particle tunneling spectrum accounts for the quantized Hall state to a regime of weak tunneling in which inter-layer Coulomb interactions determine the nature of the excitation gap. Qualitative differences in magnetic field and temperature dependence of spectra are observed depending on the relative size of the single-particle tunneling gap. Most intriguingly, our measurements of samples in the regime of weak tunneling do not display a quenching of absorption intensity at v = 1 characteristic of the quantum Hall effect.

Original languageEnglish (US)
Pages (from-to)590-593
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Issue number1
StatePublished - Feb 2000
Event13th International Conference on the Electronic Properties of Two-Dimensional Systems (EP2DS-13) - Ottawa, Ont, Can
Duration: Aug 1 1999Aug 6 1999

ASJC Scopus subject areas

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


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