Inelastic scattering in a monolayer graphene sheet; a weak-localization study

Details Inelastic scattering in a monolayer graphene sheet; a weak-localization study Inelastic scattering in a monolayer graphene sheet; a weak-localization study

2008-08-19

arxiv.org/abs/0808.2599v1

Phys. Rev. B 78, 125409 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 3 figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.78.125409

Charge carriers in a graphene sheet, a single layer of graphite, exhibit much distinctive characteristics to those in other two-dimensional electronic systems because of their chiral nature. In this report, we focus on the observation of weak localization in a graphene sheet exfoliated from a piece of natural graphite and nano-patterned into a Hall-bar geometry. Much stronger chiral-symmetry-breaking elastic intervalley scattering in our graphene sheet restores the conventional weak localization. The resulting carrier-density and temperature dependence of the phase coherence length reveal that the electron-electron interaction including a direct Coulomb interaction is the main inelastic scattering factor while electron-hole puddles enhance the inelastic scattering near the Dirac point.

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