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.
- Dirac fermions
- Weak localization
ASJC Scopus subject areas
- General Physics and Astronomy