Carsten Honerkamp

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We consider extended Hubbard models with repulsive interactions on a honeycomb lattice, and the transitions from the semimetal to Mott insulating phases at half-filling. Because of the frustrated nature of the second-neighbor interactions, topological Mott phases displaying the quantum Hall and the quantum spin Hall effects are found for spinless and spin(More)
We describe a way to continue the fermionic renormalization group ¤ow into phases with broken global symmetry. The method does not require a Hubbard-Stratonovich decoupling of the interaction. Instead an in£nitesimally small symmetry breaking component is inserted in the initial action, as an initial condition for the ¤ow of the selfenergy. Its ¤ow is(More)
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