Chen, TM;
Liang, CT;
Simmons, MY;
Ritchie, DA;
Pepper, M;
(2004)
Evolution of the second lowest extended state as a function of the effective magnetic field in the fractional quantum hall regime.
Chinese Journal of Physics
, 42
(3)
307 - 311.
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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 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 Beff within the composite fermion picture.
| Type: | Article |
|---|---|
| Title: | Evolution of the second lowest extended state as a function of the effective magnetic field in the fractional quantum hall regime |
| Open access status: | An open access version is available from UCL Discovery |
| Publisher version: | http://psroc.phys.ntu.edu.tw/cjp/index.php |
| Language: | English |
| Additional information: | © 2008 The Physical Society of Republic of China/Chinese Journal of Physics. Reproduced with permission. |
| Keywords: | 2-DIMENSIONAL ELECTRON-GAS, INSULATOR-TRANSITION |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1314391 |
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