Linear and nonlinear optical properties from TDOMP2 theory
arXiv:2112.13611 · doi:10.1021/acs.jctc.1c01309
Abstract
In this work we present a derivation of the real-time time-dependent orbital-optimized Møller-Plesser TDOMP2 and its biorthogonal companion, time-dependent non-orthogonal OMP2 (TDNOMP2), theory starting from the time-dependent bivariational principle and a parametrization based on the exponential orbital-rotation operator formulation commonly used in time-independent molecular electronic-structure theory. We apply the TDOMP2 method to extract absorption spectra and frequency-dependent polarizabilities and first hyperpolarizabilities from real-time simulations, comparing the results with those obtained from conventional time-dependent coupled-cluster singles and doubles (TDCCSD) simulations and from its second-order approximation TDCC2. We also compare with results from CCSD and CC2 linear and quadratic response theory. Our results indicate that while TDOMP2 absorption spectra are of the same quality as TDCC2 spectra, frequency-dependent polarizabilities and hyperpolarizabilties from TDOMP2 simulations are significantly closer to TDCCSD results than those from TDCC2 simulations.
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- Transient spectroscopy from time-dependent electronic-structure theory without multipole expansions
- Magnetic Optical Rotation from Real-Time Simulations in Finite Magnetic Fields
- Adiabatic extraction of nonlinear optical properties from real-time time-dependent electronic-structure theory
- Computing nuclear response functions with time-dependent coupled-cluster theory