title: Two-particle response in cluster dynamical mean-field theory: formalism and application to the Raman response of high-temperature superconductors.
abstract: A method is presented for the unbiased numerical computation of two-particle response functions of correlated electron materials via a solution of the dynamical mean-field equations in the presence of a perturbing field. The power of the method is demonstrated via a computation of the Raman B(1g) and B(2g) scattering intensities of the two-dimensional Hubbard model in parameter regimes believed to be relevant to high-temperature superconductivity. The theory reproduces the "two-magnon" peak characteristic of the Raman intensity of insulating parent compounds of high-T(c) copper oxide superconductors, and shows how it evolves to a quasiparticle response, as carriers are added. The method can be applied in any situation where a solution of equilibrium dynamical mean-field equations is feasible.
authors.affiliation: Department of Physics, Columbia University, New York, New York 10027, USA.
authors.forename: Nan
authors.initials: N
authors.lastname: Lin
authors.forename: Emanuel
authors.initials: E
authors.lastname: Gull
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Millis