Doped frustrated quantum magnets fostered a lot of interest in the last few years, notably due to the recent discovery of superconductivity in such compounds (Cobaltites -> triangular lattice, Osmium / Rhenium oxides -> pyrochlore lattice). Here we study numerically the two-dimensional Kagome lattice for different doping levels in the framework of the t-J model. Some rather unconventional phenomena are found: there are no well defined quasiparticles for the single hole problem, we rather find spin-charge separation; two or more holes repel each other, therefore no real-space binding is present. Finally at the commensurate doping one-third we detect an insulating, symmetry-breaking state involving local singlet formation. We also comment on the possible occurrence of RVB-superconductivity in this system.

Lausanne