title: Polarized resonant inelastic x-ray scattering as an ultrafine probe of excited States of La2CuO4.
abstract: X-ray absorption is the standard method to probe the unoccupied density of states at a given edge. Here we show that polarized resonant inelastic x-ray scattering in La2CuO4 at the Cu L edge is extremely sensitive to the environment of the Cu atom and the fine structure in the Cu 4p density of states. Combined ab initio and many-body cluster calculations, used for the first time in such a context, show remarkable agreement with experiment. In particular, we identify a nonlocal effect, namely, a transition to off-site Cu 3d states.
authors.affiliation: Institut de Minéralogie et de Physique des Milieux Condensées, 4 Place Jussieu, 75252 Paris cedex 05, France.
authors.forename: Abhay
authors.initials: A
authors.lastname: Shukla
authors.forename: Matteo
authors.initials: M
authors.lastname: Calandra
authors.forename: Munetaka
authors.initials: M
authors.lastname: Taguchi
authors.forename: Akio
authors.initials: A
authors.lastname: Kotani
authors.forename: György
authors.initials: G
authors.lastname: Vankó
authors.forename: S-W
authors.initials: SW
authors.lastname: Cheong