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TT: Fachverband Tiefe Temperaturen

TT 47: Correlated Electrons: Spin Systems and Itinerant Magnets - Frustrated Magnets III

TT 47.6: Vortrag

Dienstag, 1. April 2014, 15:15–15:30, HSZ 03

Strongly Correlated Fermions on the Kagome Lattice — •Krishanu Roychowdhury and Frank Pollmann — MPIPKS, Dresden, germany

We consider an extended fermionic Hubbard model on the kagome lattice and show that this model exhibits exciting phenomena at certain fractional filling factors. The strong coupling regime of the model, described by an effective low-energy Hamiltonian, includes competing interactions, i.e., fermionic ring exchange as well as an antiferromagnetic Heisenberg term. We find that the interplay between spin and charge degrees of freedom enforces a quantum phase transition between phases with different spin and charge ordering at 1/3 filling. Following a similar spirit, we also discuss the spin polarized case at 1/6, 1/3 and 1/2 filling and focus on the influence of longer ranged interactions. The possibilities to stabilize topologically ordered phases are explored in detail.