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

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

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

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 xx, 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 μqof 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, xxis close to the Hall resistivity xy, i.e., the classical mobility μBcis ≈ 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.

Original languageEnglish
Pages (from-to)1-5
Number of pages5
JournalNanoscale Research Letters
Volume8
Issue number1
DOIs
StatePublished - 14 Jun 2013

Keywords

  • Graphene flake
  • Insulator-quantum hall transition
  • Multi-layer grapheme

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    Chuang, C., Lin, L. H., Aoki, N., Ouchi, T., Mahjoub, A. M., Woo, T. P., Bird, J. P., Ochiai, Y., Lo, S-T., & Liang, C. T. (2013). Experimental evidence for direct insulator-quantum Hall transition in multi-layer grapheme. Nanoscale Research Letters, 8(1), 1-5. https://doi.org/10.1186/1556-276X-8-214