Manifestation of nonlocal electron-electron interaction in graphene

Electron-electron interaction in the magnetoresistance of graphene.

We investigate the magnetotransport in large area graphene Hall bars epitaxially grown on silicon carbide. In the intermediate field regime between weak localization and Landau quantization, the observed temperature-dependent parabolic magnetoresistivity is a manifestation of the electron-electron interaction. We can consistently describe the data with a model for diffusive (magneto)transport t...

Electron–electron interaction in high-quality epitaxial graphene

Weak localization is studied in two high-quality epitaxial graphene samples grown on silicon-faced 6H-SiC substrates. Following the methodology of Kozikov et al (2010 Phys. Rev. B 82 075424), we measured the temperature dependence of carrier conductivity at zero and low magnetic (B) fields. In both samples, a logarithmic temperature dependence of the carrier conductivity was observed at B = 0 a...

Electron viscosity, current vortices and negative nonlocal resistance in graphene

Quantum-critical strongly correlated electron systems are predicted to feature universal collision-dominated transport resembling that of viscous fluids1–4. However, investigation of these phenomena has been hampered by the lack of known macroscopic signatures of electron viscosity5–9. Here we identify vorticity as such a signature and link it with a readilyverifiablestrikingmacroscopicd.c. tra...

Effective mass of electrons and holes in bilayer graphene: Electron-hole asymmetryand electron-electron interaction

Electron transport, interaction and spin in graphene and graphene nanoribbons

Since the isolation of graphene in 2004, this novel material has become the major object of modern condensed matter physics. Despite of enormous research activity in this field, there are still a number of fundamental phenomena that remain unexplained and challenge researchers for further investigations. Moreover, due to its unique electronic properties, graphene is considered as a promising ca...