Evolution of the second lowest extended state as a function of the effective magnetic field in the fractional quantum Hall regime

Tse-Ming Chen, C. T. Liang, M. Y. Simmons, D. A. Ritchie, M. Pepper

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

It has been shown that, at a Landau level filling factor v=1/2, a two-dimensional electron system can be mathematically transformed into a composite fermion system interacting with a Chern-Simons gauge field. At v=1/2. the average of this Chern-Simons gauge field cancels the external magnetic field Bext so that the effective magnetic field Beff acting on the composite fermions is zero. Away from v=1/2, the composite fermions experience a net effective magnetic field Beff. We present the first study of the evolution of the second lowest extended state in a vanishing effective magnetic field in the fractional quantum Hall regime. Our result shows that the evolution of the second lowest extended state has a good linear dependence on the effective magnetic field Beff within the composite fermion picture.

Original languageEnglish
Pages (from-to)307-311
Number of pages5
JournalChinese Journal of Physics
Volume42
Issue number3
Publication statusPublished - 2004 Jun 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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