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 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.
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 6月 |
All Science Journal Classification (ASJC) codes
- 一般物理與天文學