The fate of quantum Hall extended states as B → 0 and the possibility of a 2D metal

C. E. Yasin, M. Y. Simmons, A. R. Hamilton, N. E. Lumpkin, R. G. Clark, L. N. Pfeiffer, K. W. West

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations


We report the study of two-dimensional 'metallic' behaviour at B = 0 in ultra-high-quality n-GaAs (μpeak > 107 cm2 V-1 s-1), and in particular address the question of what happens to the quantum Hall extended states at the centre of Landau levels as B → 0. In these high-quality electron samples we can reach extremely low carrier densities (2 × 109 cm-2), allowing us to track the extended states down to very low magnetic fields (down to ∼ 0.05 T). Our result suggests that as B → 0 the extended states float up in energy as predicted by the scaling theory of localisation.

Original languageEnglish (US)
Pages (from-to)646-649
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Issue number1-4
StatePublished - Jan 2002
Externally publishedYes
Event14th International Conference on the - Prague, Czech Republic
Duration: Jul 30 2001Aug 3 2001

All Science Journal Classification (ASJC) codes

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


  • Metal-insulator transition
  • Quantum Hall effect


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