Thermometry for Dirac fermions in graphene

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

doi:10.3938/jkps.66.1

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2016

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“…The observed difference in their transport properties thereby comes from the difference in their effective disorder strength. We have observed the existence of weakly disordered pathways by a transport-based approach and anticipate that our work will stimulate further investigations and applications on the imperfect graphene [54][55][56][57].…”

Section: Resultsmentioning

confidence: 77%

Unveiling conducting pathways embedded in strongly disordered graphene

Yang

Shih

et al. 2016

Semicond. Sci. Technol.

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Graphene shows very different electrical properties under the influence of electrical environments. For example, pristine graphene can show either insulating or normally metallic behavior when supported by different substrates. Here we study charge transport in disordered graphene grown by chemical vapor deposition with varying channel widths. We demonstrate that at high temperatures homogeneous hopping governs the electrical characteristics, whereas at low enough temperatures where charge hopping is frozen out carriers through the embedded weakly disordered conducting pathways contribute a finite conductance instead of being strongly insulating. Our work not only reveals their inhomogeneous features but also provides a new approach for characterizing the surface disorder in large-area graphene systems.

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Section: Resultsmentioning

confidence: 77%