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Dirac fermion heating, current scaling, and direct insulator-quantum Hall transition in multilayer epitaxial graphene
We have performed magnetotransport measurements on multilayer epitaxial graphene. By increasing the driving current I through our graphene devices while keeping the bath temperature fixed, we are able to study Dirac fermion heating and current scaling in such devices. Using zero-field resistivity as...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3765374/ https://www.ncbi.nlm.nih.gov/pubmed/23968131 http://dx.doi.org/10.1186/1556-276X-8-360 |
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author | Liu, Fan-Hung Hsu, Chang-Shun Chuang, Chiashain Woo, Tak-Pong Huang, Lung-I Lo, Shun-Tsung Fukuyama, Yasuhiro Yang, Yanfei Elmquist, Randolph E Liang, Chi-Te |
author_facet | Liu, Fan-Hung Hsu, Chang-Shun Chuang, Chiashain Woo, Tak-Pong Huang, Lung-I Lo, Shun-Tsung Fukuyama, Yasuhiro Yang, Yanfei Elmquist, Randolph E Liang, Chi-Te |
author_sort | Liu, Fan-Hung |
collection | PubMed |
description | We have performed magnetotransport measurements on multilayer epitaxial graphene. By increasing the driving current I through our graphene devices while keeping the bath temperature fixed, we are able to study Dirac fermion heating and current scaling in such devices. Using zero-field resistivity as a self thermometer, we are able to determine the effective Dirac fermion temperature (T(DF)) at various driving currents. At zero field, it is found that T(DF) ∝ I(≈1/2). Such results are consistent with electron heating in conventional two-dimensional systems in the plateau-plateau transition regime. With increasing magnetic field B, we observe an I-independent point in the measured longitudinal resistivity ρ(xx) which is equivalent to the direct insulator-quantum Hall (I-QH) transition characterized by a temperature-independent point in ρ(xx). Together with recent experimental evidence for direct I-QH transition, our new data suggest that such a transition is a universal effect in graphene, albeit further studies are required to obtain a thorough understanding of such an effect. |
format | Online Article Text |
id | pubmed-3765374 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | Springer |
record_format | MEDLINE/PubMed |
spelling | pubmed-37653742013-09-10 Dirac fermion heating, current scaling, and direct insulator-quantum Hall transition in multilayer epitaxial graphene Liu, Fan-Hung Hsu, Chang-Shun Chuang, Chiashain Woo, Tak-Pong Huang, Lung-I Lo, Shun-Tsung Fukuyama, Yasuhiro Yang, Yanfei Elmquist, Randolph E Liang, Chi-Te Nanoscale Res Lett Nano Express We have performed magnetotransport measurements on multilayer epitaxial graphene. By increasing the driving current I through our graphene devices while keeping the bath temperature fixed, we are able to study Dirac fermion heating and current scaling in such devices. Using zero-field resistivity as a self thermometer, we are able to determine the effective Dirac fermion temperature (T(DF)) at various driving currents. At zero field, it is found that T(DF) ∝ I(≈1/2). Such results are consistent with electron heating in conventional two-dimensional systems in the plateau-plateau transition regime. With increasing magnetic field B, we observe an I-independent point in the measured longitudinal resistivity ρ(xx) which is equivalent to the direct insulator-quantum Hall (I-QH) transition characterized by a temperature-independent point in ρ(xx). Together with recent experimental evidence for direct I-QH transition, our new data suggest that such a transition is a universal effect in graphene, albeit further studies are required to obtain a thorough understanding of such an effect. Springer 2013-08-22 /pmc/articles/PMC3765374/ /pubmed/23968131 http://dx.doi.org/10.1186/1556-276X-8-360 Text en Copyright ©2013 Liu et al.; licensee Springer. http://creativecommons.org/licenses/by/2.0 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. |
spellingShingle | Nano Express Liu, Fan-Hung Hsu, Chang-Shun Chuang, Chiashain Woo, Tak-Pong Huang, Lung-I Lo, Shun-Tsung Fukuyama, Yasuhiro Yang, Yanfei Elmquist, Randolph E Liang, Chi-Te Dirac fermion heating, current scaling, and direct insulator-quantum Hall transition in multilayer epitaxial graphene |
title | Dirac fermion heating, current scaling, and direct insulator-quantum Hall transition in multilayer epitaxial graphene |
title_full | Dirac fermion heating, current scaling, and direct insulator-quantum Hall transition in multilayer epitaxial graphene |
title_fullStr | Dirac fermion heating, current scaling, and direct insulator-quantum Hall transition in multilayer epitaxial graphene |
title_full_unstemmed | Dirac fermion heating, current scaling, and direct insulator-quantum Hall transition in multilayer epitaxial graphene |
title_short | Dirac fermion heating, current scaling, and direct insulator-quantum Hall transition in multilayer epitaxial graphene |
title_sort | dirac fermion heating, current scaling, and direct insulator-quantum hall transition in multilayer epitaxial graphene |
topic | Nano Express |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3765374/ https://www.ncbi.nlm.nih.gov/pubmed/23968131 http://dx.doi.org/10.1186/1556-276X-8-360 |
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