Projection-Based Density Matrix Renormalization Group in Density Functional Theory Embedding.

Area of Science:

• Computational chemistry
• Quantum mechanics
• Strong correlation in molecules

Background:

• The Density Matrix Renormalization Group (DMRG) method is effective for strong correlation but faces computational scaling limitations.
• Dynamical electron correlation is often missing in DMRG calculations for larger molecules.

Purpose of the Study:

• To develop and validate a hybrid approach combining DMRG with Density Functional Theory (DFT).
• To improve the accuracy of computational methods for molecules with strongly correlated fragments.

Main Methods:

• Projection-based wave function (WF)-in-DFT embedding.
• Integration of DMRG with DFT for molecular calculations.

Main Results:

• The developed DMRG-in-DFT approach accurately describes molecules containing strongly correlated fragments.
• Demonstrated the method's efficacy on two key molecular examples.

Conclusions:

• The hybrid DMRG-in-DFT method offers a promising solution for accurate electronic structure calculations.
• This approach effectively addresses the limitations of standalone DMRG for larger, complex molecules.