Two-Dimensional Nonlinear Laser Spectra Calculations with Numerical Path Integral

Two-dimensional three-order nonlinear response functions and the laser spectra of the two-level Frenkel-exciton model,interacting with three short laser pulses in direction-k_(1)+k_(2)+k_(3),are calculated using the numerical path integral.The method is non-Markovian and the results show that the numerical simulation scheme provides a new pathway for theoretically investigating the multidimensional ultrafast laser spectra including the non-Markovian effects.