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The ground state phase transitions in the distorted S=1 kagome Heisenbergantiferromagnet (KHAF) with single-site anisotropy D are studied by thenumerical exact diagonalization method. For strong easy plane anisotropy, thehexgonal singlet solid (HSS) ground state of the uniform KHAF is destroyed andlarge-D state is realized. The quantum phase transition between these twostates is analogous to the Haldane-large-D transition in the S=1antiferromagnetic Heisenberg chain. The combined effect of the sqrt(3) timessqrt(3) lattice distortion and single site anisotropy is also investigated. Theground state phase diagram expected from the numerical results is presented.The presence of this transition is consistent with the HSS picture of theground state of the uniform S=1 KHAF and supports its validity.Comment: 4 pages, 5 figures, 1 tabl

Ground State Phase Diagram of the DistortedS=1 Kagomé Heisenberg Antiferromagnets with Single-site Anisotropy