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¹Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science, Hamburg 22761, Germany.

The Journal of Physical Chemistry Letters

|July 8, 2024

Summary

This summary is machine-generated.

This study investigates the impact of exchange-correlation (XC) functionals on molecular high harmonic generation (HHG) using time-dependent density functional theory (TDDFT). Simpler XC approximations are justified, as complex functionals can yield unphysical results in HHG calculations.

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Area of Science:

Computational physics and chemistry
Quantum mechanics
Nonlinear optics

Background:

Time-dependent density functional theory (TDDFT) is widely used for simulating light-matter interactions in molecules and solids.
TDDFT offers a balance of accuracy and computational efficiency for ab initio calculations.
Current TDDFT implementations often rely on simplified exchange-correlation (XC) functionals, like LDA and GGAs, which may lack chemical accuracy.

Purpose of the Study:

To systematically investigate the influence of various exchange-correlation (XC) functionals on molecular high harmonic generation (HHG).
To evaluate the suitability of different levels of theory for accurate HHG predictions.
To determine if simpler XC approximations are sufficient for reliable HHG simulations.

Main Methods:

Employed time-dependent density functional theory (TDDFT) for molecular simulations.
Tested a range of exchange-correlation (XC) functionals, including hybrid, meta-functionals, and Hartree-Fock approximations.
Analyzed numerical results to assess the impact of XC functional choice on high harmonic generation (HHG) spectra.

Main Results:

Demonstrated that simpler XC approximations (e.g., LDA, GGAs) are often sufficient and justified for molecular HHG calculations.
Observed that more complex functionals, including hybrid and meta-functionals, can produce poor and unphysical results for HHG.
Identified a potential discrepancy between advanced XC functionals and the adiabatic approximation in TDDFT.

Conclusions:

Simpler exchange-correlation (XC) functionals are recommended for time-dependent density functional theory (TDDFT) calculations of molecular high harmonic generation (HHG).
The use of complex XC functionals in TDDFT for HHG may lead to unphysical outcomes.
Further research is needed to understand the failure of elaborate XC functionals, possibly related to the adiabatic approximation.