Thermometry for Dirac fermions in graphene

Fan Hung Liu; Chang Shun Hsu; Shun Tsung Lo; Chiashain Chuang; Lung I. Huang; Tak Pong Woo; Chi Te Liang; Y. Fukuyama; Y. Yang; R. E. Elmquist; Pengjie Wang; Xi Lin

doi:10.3938/jkps.66.1

Thermometry for Dirac fermions in graphene

Fan Hung Liu, Chang Shun Hsu, Shun Tsung Lo, Chiashain Chuang, Lung I. Huang, Tak Pong Woo, Chi Te Liang, Y. Fukuyama, Y. Yang, R. E. Elmquist, Pengjie Wang, Xi Lin

Research output: Contribution to journal › Article › peer-review

Abstract

We use both the zero-magnetic-field resistivity and the phase coherence time determined by weak localization as independent thermometers for Dirac fermions (DF) in multilayer graphene. In the high current (I) region, there exists a simple power law T_DF ∝ I^~0.5, where T_DF is the effective Dirac fermion temperature for epitaxial graphene on SiC. In contrast, T_DF ∝ I^~1 in exfoliated multilayer graphene. We discuss possible reasons for the different power laws observed in these multilayer graphene systems. Our experimental results on DF-phonon scattering may find applications in graphene-based nanoelectronics.

Original language	English (US)
Pages (from-to)	1-6
Number of pages	6
Journal	Journal of the Korean Physical Society
Volume	66
Issue number	1
DOIs	https://doi.org/10.3938/jkps.66.1
State	Published - 2015
Externally published	Yes

Keywords

Dirac fermions
Graphene
Thermometry
Weak localization

ASJC Scopus subject areas

General Physics and Astronomy

Online availability

10.3938/jkps.66.1

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title = "Thermometry for Dirac fermions in graphene",

abstract = "We use both the zero-magnetic-field resistivity and the phase coherence time determined by weak localization as independent thermometers for Dirac fermions (DF) in multilayer graphene. In the high current (I) region, there exists a simple power law TDF ∝ I~0.5, where TDF is the effective Dirac fermion temperature for epitaxial graphene on SiC. In contrast, TDF ∝ I~1 in exfoliated multilayer graphene. We discuss possible reasons for the different power laws observed in these multilayer graphene systems. Our experimental results on DF-phonon scattering may find applications in graphene-based nanoelectronics.",

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doi = "10.3938/jkps.66.1",

language = "English (US)",

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T1 - Thermometry for Dirac fermions in graphene

AU - Liu, Fan Hung

AU - Hsu, Chang Shun

AU - Lo, Shun Tsung

AU - Chuang, Chiashain

AU - Huang, Lung I.

AU - Woo, Tak Pong

AU - Liang, Chi Te

AU - Fukuyama, Y.

AU - Yang, Y.

AU - Elmquist, R. E.

AU - Wang, Pengjie

AU - Lin, Xi

PY - 2015

Y1 - 2015

N2 - We use both the zero-magnetic-field resistivity and the phase coherence time determined by weak localization as independent thermometers for Dirac fermions (DF) in multilayer graphene. In the high current (I) region, there exists a simple power law TDF ∝ I~0.5, where TDF is the effective Dirac fermion temperature for epitaxial graphene on SiC. In contrast, TDF ∝ I~1 in exfoliated multilayer graphene. We discuss possible reasons for the different power laws observed in these multilayer graphene systems. Our experimental results on DF-phonon scattering may find applications in graphene-based nanoelectronics.

AB - We use both the zero-magnetic-field resistivity and the phase coherence time determined by weak localization as independent thermometers for Dirac fermions (DF) in multilayer graphene. In the high current (I) region, there exists a simple power law TDF ∝ I~0.5, where TDF is the effective Dirac fermion temperature for epitaxial graphene on SiC. In contrast, TDF ∝ I~1 in exfoliated multilayer graphene. We discuss possible reasons for the different power laws observed in these multilayer graphene systems. Our experimental results on DF-phonon scattering may find applications in graphene-based nanoelectronics.

KW - Dirac fermions

KW - Graphene

KW - Thermometry

KW - Weak localization

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JF - Journal of the Korean Physical Society

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Thermometry for Dirac fermions in graphene

Abstract

Keywords

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