Wigner crystal versus Hall insulator

H. C. Manoharan, M. Shayegan

Research output: Contribution to journalReview article

46 Scopus citations

Abstract

In a very-low-disorder two-dimensional hole system we observe a ul direct transition from a well developed ul high-order fractional quantum Hall state at ν=2/5 to an insulating state at 1/3<ν<2/5. As T→0, ρxx→ for the insulating phase, while ρxx→0 for the fractional quantum Hall states at ν=2/5 and 1/3, yielding quasiparticle excitation gaps of 0.60 and 3.6 K, respectively. The topology of the theoretical disorder versus magnetic field global phase diagram for this system expressly forbids the direct quantum liquid-to-insulator transition we observe, ruling out the disorder-induced ''Hall insulator'' as the explanation.

Original languageEnglish (US)
Pages (from-to)17662-17665
Number of pages4
JournalPhysical Review B
Volume50
Issue number23
DOIs
StatePublished - Jan 1 1994

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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