2017/02/28 by Zeng-Zhao Li, Lukas Bruder, F. Stienkemeier +2
Physics and Astronomy · #Atomic and Subatomic Physics Research #Dipole #Materials science #Molecular physics #Nonlinear system #Phase (matter) #Physics #Quantum mechanics #Quantum optics and atomic interactions #Spectroscopy #Spectroscopy and Quantum Chemical Studies #physics.atom-ph #quant-ph
paper · pdf · doi:10.1103/physreva.95.052509
published as Phys. Rev. A 95, 052509 (2017) · 12 pages, 8 figures, Supporting information provided with the source files
arxiv created 2017/05/26 · openalex publication_date 2017/05/26 · arxiv updated 2017/05/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Phase-modulated nonlinear spectroscopy with higher harmonic demodulation has recently been suggested to provide information on many-body excitations. In the present work we theoretically investigate the application of this method to infer the interaction strength between two particles that interact via weak dipole-dipole interaction. To this end we use a full numerical solution of the Schr"odinger equation with time-dependent pulses. For interpretation purposes we also derive analytical expressions in perturbation theory. We find one can detect dipole-dipole interaction via peak intensities (in contrast to line-shifts which typically are used in conventional spectroscopy). We provide a detailed study on the dependence of these intensities on the parameters of the laser pulse and the dipole-dipole interaction strength. Interestingly, we find that there is a phase between the first and second harmonic demodulated signal whose value depends on the sign of the dipole-dipole interaction.