Experimental evidence for direct insulator-quantum Hall transition in multi-layer graphene

被引:0
作者
Chiashain Chuang
Li-Hung Lin
Nobuyuki Aoki
Takahiro Ouchi
Akram M Mahjoub
Tak-Pong Woo
Jonathan P Bird
Yuichi Ochiai
Shun-Tsung Lo
Chi-Te Liang
机构
[1] National Taiwan University,Department of Physics
[2] Chiba University,Graduate School of Advanced Integration Science
[3] National Chiayi University,Department of Electrophysics
[4] University at Buffalo,Department of Electrical Engineering
[5] The State University of New York,Graduate Institute of Applied Physics
[6] National Taiwan University,undefined
来源
Nanoscale Research Letters | / 8卷
关键词
Insulator-quantum Hall transition; Graphene flake; Multi-layer graphene;
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摘要
We have performed magnetotransport measurements on a multi-layer graphene flake. At the crossing magnetic field Bc, an approximately temperature-independent point in the measured longitudinal resistivity ρxx, which is ascribed to the direct insulator-quantum Hall (I-QH) transition, is observed. By analyzing the amplitudes of the magnetoresistivity oscillations, we are able to measure the quantum mobility μq of our device. It is found that at the direct I-QH transition, μqBc ≈ 0.37 which is considerably smaller than 1. In contrast, at Bc, ρxx is close to the Hall resistivity ρxy, i.e., the classical mobility μBc is ≈ 1. Therefore, our results suggest that different mobilities need to be introduced for the direct I-QH transition observed in multi-layered graphene. Combined with existing experimental results obtained in various material systems, our data obtained on graphene suggest that the direct I-QH transition is a universal effect in 2D.
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