Session W29: Focus Session: Graphene V

2:30 PM–5:30 PM, Thursday, March 8, 2007
Colorado Convention Center Room: 303

Sponsoring Unit: DMP
Chair: Kirill Bolotin, Columbia University

Abstract ID: BAPS.2007.MAR.W29.4

Abstract: W29.00004 : Instabilities of correlated electrons on the honeycomb lattice

3:06 PM–3:18 PM

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Author:

Carsten Honerkamp
(Wuerzburg University)

Motivated by the possible relevance to graphene we analyze instabilities of electrons on a honeycomb lattice, interacting by Hubbard and longer-ranged interactions. Using a functional renormalization group scheme which takes into account the wavevector-dependence of the interactions throughout the Brillouin zone, we detect the leading ordering tendencies at low temperatures. Near half band filling and for dominant onsite repulsion, a critical minimal interaction strength is required for an instability toward antiferromagnetic order, in support of a previous large-$N$ work of Herbut [Phys. Rev. Lett. 97, 146401 (2006)] which focused on the Dirac points. We also present results for longer-ranged interactions and away from half band filling.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.MAR.W29.4