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Multidimensional coherent spectroscopy of correlated lattice systems
1Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland.
Npj Computational Materials
|May 12, 2025
Summary
Multidimensional coherent spectroscopy (MDCS) reveals excitation pathways in correlated solids. This technique diagnoses nonequilibrium states and coherent processes in complex materials.
Area of Science:
- Condensed Matter Physics
- Quantum Chemistry
- Spectroscopy
Background:
- Multidimensional coherent spectroscopy (MDCS) is a key technique in quantum chemistry for probing molecular dynamics.
- Its application to correlated electron materials presents interpretation challenges due to complex electronic interactions.
Purpose of the Study:
- To systematically study MDCS signals in correlated lattice systems.
- To demonstrate MDCS as a diagnostic tool for excitation pathways and coherent processes.
- To extract information on photo-excited nonequilibrium states in correlated solids.
Main Methods:
- Utilizing the Keldysh contour representation of effective models.
- Employing nonequilibrium dynamical mean field theory.
- Analyzing laser-induced currents from ultrashort pulse sequences.
Main Results:
- MDCS effectively probes nonlinear responses and nonequilibrium dynamics.
- The technique successfully diagnoses excitation pathways and coherent phenomena.
- Detailed information on photo-excited states and their evolution is obtainable.
Conclusions:
- MDCS is a powerful tool for understanding correlated electron materials.
- The study validates MDCS for characterizing complex electronic dynamics.
- This work advances the application of spectroscopic techniques in condensed matter physics.
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