%0 Journal Article
%T Electronic Structure of Mott Insulators Studied by Inelastic X-ray Scattering
%A M. Z. Hasan
%A E. D. Isaacs
%A Z-X. Shen
%A L. L. Miller
%A K. Tsutsui
%A T. Tohyama
%A S. Maekawa
%J Physics
%D 2001
%I arXiv
%R 10.1126/science.288.5472.1811
%X The electronic structure of Mott insulators continues to be a major unsolved problem in physics despite more than half-century of intense research efforts. Well-developed momentum-resolved spectroscopies such as photoemission or neutron scattering cannot probe the full Mott gap. We report observation of dispersive charge excitations across the Mott gap in a high Tc parent cuprate Ca2CuO2Cl2 using high resolution resonant inelastic x-ray scattering shedding light on the anisotropy of Mott-gap. The results provide direct support for the Hubbard model to describe charge excitations across the Mott gap.
%U http://arxiv.org/abs/cond-mat/0102489v2