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TT: Fachverband Tiefe Temperaturen

TT 24: Correlated Electrons: Low-dimensional Systems - Models

TT 24.3: Talk

Wednesday, February 27, 2008, 14:30–14:45, H 2053

Novel many-body states on the honeycomb lattice — •Carsten Honerkamp — Theoretische Physik, Universität Würzburg

We apply a functional renormalization group scheme to search for interesting many-body states of electrons on the honeycomb lattice, interacting by onsite and up to second nearest-neighbor terms. Near half band-filling, critical minimal interaction strengths are required for instabilities toward antiferromagnetic or charge-density wave order. A strong second-nearest neighbor repulsion drives the system into a quantum-spin-Hall insulating state. Away from half filling, f-wave triplet pairing and d+id singlet pairing instabilities are found to emerge out of density-wave regimes.