Journal
PHYSICAL REVIEW B
Volume 104, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.115105
Keywords
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Funding
- JSPS KAKENHI [19K14638]
- Grants-in-Aid for Scientific Research [19K14638] Funding Source: KAKEN
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The proposed method uses 2D spectroscopy to directly probe quantum many-body interactions, providing insights into the electrical, magnetic, optical, and thermal properties of the system. Simulation results reveal distinct differences in the 2D spectrum between non-interacting and strongly interacting systems, highlighting the evolution of interactions over time delays.
Interactions between particles in quantum many-body systems play a crucial role in determining the electric, magnetic, optical, and thermal properties of the system. The recent progress in the laser-pulse technique has enabled the manipulations and measurements of physical properties on ultrafast timescales. Here we propose a method for the direct and ultrafast probing of quantum many-body interaction through coherent two-dimensional (2D) spectroscopy. Using a two-band fermionic Hubbard model for the minimum two-site lattice system, we find that the 2D spectrum of a noninteracting system contains only diagonal peaks; the interparticle interaction manifests itself in the emergence of off-diagonal peaks in the 2D spectrum before all the peaks coalesce into a single diagonal peak as the system approaches the strongly interacting limit. The evolution of the 2D spectrum as a function of the time delay between the second and third laser pulses can provide important information on the ultrafast time variation of the interaction.
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