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arXiv 0802.1378cond-mat.mes-hallcond-mat.dis-nn
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GaAs二维电子系统中存在绝缘体-量子霍尔跃迁时的Landau量子化

Probing Landau quantisation with the presence of insulator-quantum Hall transition in a GaAs two-dimensional electron system

Kuang Yao Chen, Y. H. Chang, C. -T. Liang, N. Aoki, Y. Ochiai, C. F. Huang, Li-Hung Lin, K. A. Cheng, H. H. Cheng, H. H. Lin, Jau-Yang Wu, Sheng-Di Lin

摘要:

对AlGaAs/GaAs异质结中的二维电子系统(2DES)进行了磁输运测量。通过增加垂直于2DES的磁场,由于朗道量子化的磁阻振荡,可以确定附近的直接绝缘体量子霍尔(I-QH)过渡。然而,从振荡和转变点获得不同的迁移率。我们的研究表明,直接I-QH过渡并不总是对应于强本地化的发病。

英文摘要:

Magneto-transport measurements are performed on the two-dimensional electron system (2DES) in an AlGaAs/GaAs heterostructure. By increasing the magnetic field perpendicular to the 2DES, magnetoresistivity oscillations due to Landau quantisation can be identified just near the direct insulator-quantum Hall (I-QH) transition. However, different mobilities are obtained from the oscillations and transition point. Our study shows that the direct I-QH transition does not always correspond to the onset of strong localisation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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