Dwarf galaxies in the Local Group: the VLT perspective

Recent results on the evolution of Local Group dwarf galaxies obtained from VLT imaging and spectroscopy are briefly reviewed, and prospects for dwarf galaxy research at the VLT are discussed in the light of the current and forthcoming instrumentation. Some aspects of future instrument developments, such as deep wide-field imaging at both optical and near-infrared wavelengths that may be of advantage for research on the evolution of dwarf galaxies, are briefly discussed.Comment: 6 pages, 3 figures. To be published in the Proceedings of the ESO Workshop Scientific Drivers for ESO Future VLT/VLTI Instrumentation, J. Bergeron and G. Monnet, Eds., Springer Verlag 200

Doped Mott insulator as the origin of heavy Fermion behavior in LiV2O4

We investigate the electronic structure of LiV2O4, for which heavy fermion behavior has been observed in various experiments, by the combination of the local density approximation and dynamical mean field theory. To obtain results at zero temperature, we employ the projective quantum Monte Carlo method as an impurity solver. Our results show that the strongly correlated a1g band is a lightly doped Mott insulator which -at low temperatures- shows a sharp (heavy) quasiparticle peak just above the Fermi level, which is consistent with recent photoemission experiment by Shimoyamada et al. [Phys. Rev. Lett. 96 026403 (2006)].Comment: 4 pages, 5 figure