Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.106401
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Funding
- Division of Scientific User Facilities, U.S. Department of Energy
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- [NSF-DMR-1006282]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1006282] Funding Source: National Science Foundation
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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.
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