title: Dirac fermion heating, current scaling, and direct insulator-quantum Hall transition in multilayer epitaxial graphene.
abstract: 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 (TDF) at various driving currents. At zero field, it is found that TDF ∝ 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 ρxx which is equivalent to the direct insulator-quantum Hall (I-QH) transition characterized by a temperature-independent point in ρxx. 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.
authors: Graduate Institute of Applied Physics, National Taiwan University, Taipei 106, Taiwan. ctliang@phys.ntu.edu.tw.
authors: Fan-Hung
authors: FH
authors: Liu
authors: Chang-Shun
authors: CS
authors: Hsu
authors: Chiashain
authors: C
authors: Chuang
authors: Tak-Pong
authors: TP
authors: Woo
authors: Lung-I
authors: LI
authors: Huang
authors: Shun-Tsung
authors: ST
authors: Lo
authors: Yasuhiro
authors: Y
authors: Fukuyama
authors: Yanfei
authors: Y
authors: Yang
authors: Randolph E
authors: RE
authors: Elmquist
authors: Chi-Te
authors: CT
authors: Liang
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