Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 19: Correlated Electrons: (General) Theory 2

TT 19.6: Talk

Tuesday, March 27, 2012, 10:45–11:00, H 3010

Phase diagram of honeycomb bilayer from functional RG — •Stefan Uebelacker, Michael Scherer, and Carsten Honerkamp — Institut für Theoretische Festkörperphysik C, RWTH Aachen University, Aachen, Germany

The phase diagram for interacting electrons on the honeycomb bilayer with Bernal stacking is explored by means of the functional renormalization group. For half-filling and including a range of repulsive onsite, nearest-neighbor and next-to-nearest neighbor interaction terms we analyze the emergent instabilities and find antiferromagnetic, (modulated) charge-density-wave and quantum spin Hall order. The presented phase diagram covers the region of the bilayer graphene parameters suggested by ab initio calculations which overlaps with the phase boundary between the antiferromagnetic state and the quantum spin Hall state. We comment on the effect of small dopings and third nearest neighbor interaction.