Unraveling the Nature of Charge Excitations in La2CuO4 with Momentum-Resolved Cu K-edge Resonant Inelastic X-ray Scattering

C.-C. Chen, 2 B. Moritz, F. Vernay, J. N. Hancock, 6 S. Johnston, C. J. Jia, G. Chabot-Couture, M. Greven, I. Elfimov, G. A. Sawatzky, and T. P. Devereaux Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA Department of Physics, Stanford University, Stanford, California 94305, USA Department of Physics and Astrophysics, University of North Dakota, Grand Forks, North Dakota 58202, USA LAMPS, Université de Perpignan Via Domitia, F-66860 Perpignan, France Stanford Synchrotron Radiation Laboratory, Stanford, California 94309, USA Départment de Physique de la Matière Condensée, 24 quai Ernest-Ansermet, Université de Genève, Genève, CH-1211, Switzerland Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada Department of Applied Physics, Stanford University, Stanford, California 94305, USA School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada (Dated: September 20, 2010)