Multiple Core-Hole Coherence in X-Ray Four-Wave-Mixing Spectroscopies

Details Multiple Core-Hole Coherence in X-Ray Four-Wave-Mixing Spectroscopies Multiple Core-Hole Coherence in X-Ray Four-Wave-Mixing Spectroscopies

2005-10-24

arxiv.org/abs/cond-mat/0510641v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.72.235110

Correlation-function expressions are derived for the coherent nonlinear response of molecules to three resonant ultrafast pulses in the x-ray regime. The ability to create two-core-hole states with controlled attosecond timing in four-wave-mixing and pump probe techniques should open up new windows into the response of valence electrons, which are not available from incoherent x-ray Raman and fluorescence techniques. Closed expressions for the necessary four-point correlation functions are derived for the electron-boson model by using the second order cumulant expansion to describe the fluctuating potentials. The information obtained from multidimensional nonlinear techniques could be used to test and refine this model, and establish an anharmonic oscillator picture for electronic excitations.

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