### 摘要

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 B_{ext} so that the effective magnetic field B_{eff} acting on the composite fermions is zero. Away from v=1/2, the composite fermions experience a net effective magnetic field B_{eff}. 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 B_{eff} within the composite fermion picture.

原文 | English |
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頁（從 - 到） | 307-311 |

頁數 | 5 |

期刊 | Chinese Journal of Physics |

卷 | 42 |

發行號 | 3 |

出版狀態 | Published - 2004 六月 1 |

### All Science Journal Classification (ASJC) codes

- Physics and Astronomy(all)

## 指紋 深入研究「Evolution of the second lowest extended state as a function of the effective magnetic field in the fractional quantum Hall regime」主題。共同形成了獨特的指紋。

## 引用此

*Chinese Journal of Physics*,

*42*(3), 307-311.