Probing the topological structure of the QCD vacuum with overlap   fermions
  Overlap fermions implement exact chiral symmetry on the lattice and are thus an appropriate tool for investigating the chiral and topological structure of the QCD vacuum. We study various chiral and topological aspects on Luescher-Weisz-type quenched gauge field configurations using overlap fermions as a probe. Particular emphasis is placed upon the analysis of the spectral density and the localisation properties of the eigenmodes as well as on the local structure of topological charge fluctuations. 
E.-M. Ilgenfritz, K. Koller, Y. Koma, G. Schierholz, T. Streuer, V.   Weinberg