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Probing onset of strong localization and electron-electron interactions with the presence of direct insulator-quantum Hall transition

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arxiv 1004.5315 v1 pith:GUMY5DWJ submitted 2010-04-29 cond-mat.mes-hall cond-mat.dis-nn

Probing onset of strong localization and electron-electron interactions with the presence of direct insulator-quantum Hall transition

Shun-Tsung Lo , Kuang Yao Chen , T. L. Lin , Li-Hung Lin , Dong-Sheng Luo , Y. Ochiai , N. Aoki , Yi-Ting Wang
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Zai Fong Peng Yiping Lin J. C. Chen Sheng-Di Lin C. F. Huang C.-T.~Liang
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classification cond-mat.mes-hall cond-mat.dis-nn
keywords halltransitionlocalizationstrongdirectelectron-electroninsulator-quantumobserved
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We have performed low-temperature transport measurements on a disordered two-dimensional electron system (2DES). Features of the strong localization leading to the quantum Hall effect are observed after the 2DES undergoes a direct insulator-quantum Hall transition with increasing the perpendicular magnetic field. However, such a transition does not correspond to the onset of strong localization. The temperature dependences of the Hall resistivity and Hall conductivity reveal the importance of the electron-electron interaction effects to the observed transition in our study.

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