Thermometry for Dirac fermions in graphene
Journal
Journal of the Korean Physical Society
Journal Volume
66
Journal Issue
1
Date Issued
2015
Author(s)
Liu, F.-H. et al.
Hsu, C.-S.
Lo, S.-T.
Chuang, C.
Huang, L.-I.
Fukuyama, Y.
Yang, Y.
Elmquist, R.E.
Wang, P.
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.
Type
journal article