Session Z27: Invited Session: Interaction Driven Broken Symmetry States in Bilayer Graphene
11:15 AM–2:15 PM, Friday, March 2, 2012
Room: 258AB
Sponsoring Unit:
DCMP
Chair: Allan MacDonald, University of Texas at Austin
Abstract ID: BAPS.2012.MAR.Z27.1
Abstract: Z27.00001 : Theoretical Approach to Many-body Instabilities in Bilayer Graphene
11:15 AM–11:51 AM
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Author:
Oskar Vafek
(National High Magnetic Field Laboratory and Florida State University)
I will review current theoretical approach to electron-electron interaction driven many-body instabilities in bilayer graphene at the neutrality point. The role of competing interactions and the dependence of different ordering tendencies on the range of the interaction will be examined. In particular, I will argue that within the renormalization group approach, for longer range interaction giving predominantly forward scattering, the leading ordering tendency is towards a gapless electronic nematic state. For shorter range interactions giving additional back scattering comparable to the forward scattering, the leading ordering tendency is towards a gapped Neel antiferromagnet. These results will be discussed in the context of recent experiments reporting signatures of broken symmetry states in suspended bilayer graphene.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.Z27.1