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Experimental evidence for direct insulator-quantum Hall transition in multi-layer graphene.
| Content Provider | Europe PMC |
|---|---|
| Author | Chuang, Chiashain Lin, Li-Hung Aoki, Nobuyuki Ouchi, Takahiro Mahjoub, Akram M Woo, Tak-Pong Bird, Jonathan P Ochiai, Yuichi Lo, Shun-Tsung Liang, Chi-Te |
| Copyright Year | 2013 |
| 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 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. |
| ISSN | 19317573 |
| Journal | Nanoscale Research Letters |
| Volume Number | 8 |
| PubMed Central reference number | PMC3655881 |
| Issue Number | 1 |
| PubMed reference number | 23647579 |
| e-ISSN | 1556276X |
| DOI | 10.1186/1556-276x-8-214 |
| Language | English |
| Publisher | Springer |
| Publisher Date | 2013-05-06 |
| Access Restriction | Open |
| Rights License | This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Copyright ©2013 Chuang et al.; licensee Springer. |
| Subject Keyword | Insulator-quantum Hall transition Graphene flake Multi-layer graphene |
| Content Type | Text |
| Resource Type | Article |
| Subject | Nanoscience and Nanotechnology Condensed Matter Physics Materials Science |
