Breakdown of the integer and fractional quantum Hall states in a quantum point contact

C. Dillard, X. Lin, M. A. Kastner, L. N. Pfeiffer, K. W. West

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The integer and fractional quantum Hall states are known to breakdown at high dc bias, exhibiting deviation from the ideal incompressible behavior. We measure breakdown of the n = 2, 3, 4, 5 integer and the n=4/3 and 5/3 fractional states in a quantum point contact (QPC) of lithographic width ~600 nm. Dependence of the critical current on magnetic field, QPC gate voltage, and QPC width are presented. Of particular interest, the critical current of the 4/3 and 5/3 fractional states shows the opposite dependence on QPC width compared to the integer states. This previously unobserved result is not explained by current theories of breakdown.

Original languageEnglish (US)
Pages (from-to)290-296
Number of pages7
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume47
DOIs
StatePublished - 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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