Session A1: Graphene - Spectroscopies

8:00 AM–10:24 AM, Monday, March 16, 2009
- Spirit of Pittsburgh Ballroom A

Sponsoring Unit: DCMP
Chair: Amir Yacoby, Harvard University.

Abstract ID: BAPS.2009.MAR.A1.1

Abstract: A1.00001 : Infrared spectroscopy of gated structures based on single- and bi-layer graphene

8:00 AM–8:36 AM

Preview Abstract

Author:

  Dmitri Basov
    (UCSD)

Infrared spectroscopy was employed to investigated the charge dynamics in graphene integrated in tunable gated devices (Nature Physics 4, 532 (2008)). These measurements verified that electrons in single-layer graphene behave like Dirac quasiparticles but most importantly revealed several unexpected results that are beyond the theoretical predictions for idealized graphene. Several of our findings including, a systematic enhancement of the Fermi velocity at low energy and also the ``residual'' conductivity at frequencies below 2E$_F$ are indicative of many-body interactions. Recent infrared study of bilayer graphene uncovered a pronounced asymmetry in the optical conductivity upon injection of electrons and holes (arXiv:0807.3776). We believe this result is suggestive of a marked asymmetry between the valence and conduction bands in bilayer samples.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.MAR.A1.1