Charge-Carrier Screening in Single-Layer Graphene

ORAL

Abstract

Unlike normal metals that have a true Fermi surface, the pointlike Fermi surface of undoped graphene allows for long-ranged coulomb interactions to be unscreened by free charges, leading to singular behaviors. Therefore, the introduction of charge to a neutral graphene sheet can have a profound effect on transport properties and device performance. In this talk I will demonstrate the effects of charge-carrier screening of the electron-electron and electron-impurity interactions on the electronic properties of graphene, as we have observed through angle-resolved photoemission spectroscopy (ARPES). These observations help us to understand the basis for the transport properties of graphene, and shed light on the fundamental physics in the vicinity of the Dirac point crossing.

–

Authors

  • David Siegel

    University of California, Berkeley / Sandia National Laboratories, Sandia National Laboratories

  • William Regan

    University of California, Berkeley

  • Alexei Fedorov

    Lawrence Berkeley National Laboratory

  • Alex Zettle

    University of California, Berkeley / Lawrence Berkeley National Laboratory, University of California, Berkeley

  • Alessandra Lanzara

    University of California, Berkeley / Lawrence Berkeley National Laboratory, Department of Physics, University of California, Berkeley, CA 94720, USA, Department of Physics, UC Berkeley; and Materials Sciences Division, Lawrence Berkeley National Lab