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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...

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Autores principales: 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
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer 2013
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.
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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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