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Phys. Rev. B 78, 113305 (2008) [4 pages]

From insulator to quantum Hall liquid at low magnetic fields

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Tsai-Yu Huang1, C.-T. Liang1,*, Gil-Ho Kim2, C. F. Huang3, Chao-Ping Huang1, Jyun-Ying Lin1, Hsi-Sheng Goan1,4, and D. A. Ritchie5
1Department of Physics, National Taiwan University, Taipei 106, Taiwan
2School of Information and Communication Engineering and SAINT, Sungkyunkwan University, Suwon 440-746, Korea
3National Measurement Laboratory, Center for Measurement Standards, Industrial Technology Research Institute, Hsinchu 300, Taiwan
4Center for Theoretical Sciences, National Taiwan University, Taipei 106, Taiwan
5Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, United Kingdom

Received 6 June 2006; revised 11 August 2008; published 5 September 2008

We have performed low-temperature transport measurements on a GaAs two-dimensional electron system at low magnetic fields. Multiple temperature-independent points and accompanying oscillations are observed in the longitudinal resistivity between the low-field insulator and the quantum Hall (QH) liquid. Our results support the existence of an intermediate regime, where the amplitudes of magneto-oscillations can be well described by conventional Shubnikov–de Haas theory, between the low-field insulator and QH liquid.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.113305
DOI:
10.1103/PhysRevB.78.113305
PACS:
73.43.Qt, 73.21.La, 73.40.−c

*ctliang@phys.ntu.edu.tw

 
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