Bulletin of the American Physical Society
APS March Meeting 2012
Volume 57, Number 1
Monday–Friday, February 27–March 2 2012; Boston, Massachusetts
Session A27: Invited Session: Excitonic and Correlation Effects in Single-Layer Graphene
8:00 AM–11:00 AM,
Monday, February 27, 2012
Sponsoring Unit: DCMP
Chair: Bruno Uchoa, University of Oklahoma
Abstract ID: BAPS.2012.MAR.A27.3
Abstract: A27.00003 : Electron-electron interaction and excitonic effects in graphene systems*
9:12 AM–9:48 AM
Preview Abstract Abstract
Steven G. Louie
(University of California at Berkeley and Lawrence Berkeley National Laboratory)
Owing to the unique electronic structure of graphene and enhanced electron-electron and electron-hole interactions in lower dimensions, graphene structures exhibit interesting and novel electronic and optical properties. We discuss in this talk results from recent theoretical studies on several graphene systems. First-principles calculations, based on the GW-Bethe-Salpeter Equation approach, have predicted very strong features in the optical absorption spectra of single-layer graphene and multi-layer graphene, arising from resonant excitons. Many of these features have since been observed experimentally. We also explore the effects of charge carrier doping and of having an external electric field on the absorbance of graphene and bilayer graphene. Graphene nanoribbons are semiconductors that, owing to electron-electron interactions, also exhibit extraordinarily magnetic and excitonic effects. Another intriguing phenomenon is one in the magneto-optical response of graphene, which involves resonant transitions of absorption of a photon together with the simultaneous creation of an intervalley, intra-Landau level exciton and a K-phonon. Finally, first-principles results on the plasmon satellite structures in the spectral function of graphene computed with the GW method and beyond are presented. We discuss the origin of these phenomena and make comparison with experiments.
*This work was supported by NSF, U.S. Department of Energy, and ONR MURI program.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.A27.3
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700