Two-particle response in cluster dynamical mean-field theory: formalism and application to the Raman response of high-temperature superconductors.

@article{Lin2012TwoparticleRI,
  title={Two-particle response in cluster dynamical mean-field theory: formalism and application to the Raman response of high-temperature superconductors.},
  author={Nansheng Lin and Emanuel Gull and Andrew J. Millis},
  journal={Physical review letters},
  year={2012},
  volume={109 10},
  pages={
          106401
        }
}
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… 

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