Density matrix renormalization group with efficient dynamical electron correlation through range separation.

Area of Science:

• Quantum Chemistry
• Computational Physics
• Materials Science

Background:

• Accurately describing electron correlation is crucial for understanding molecular behavior.
• Multiconfigurational methods are needed for systems with strong static and dynamical correlation.
• Existing methods often struggle to balance accuracy and computational cost.

Purpose of the Study:

• To introduce a novel hybrid quantum mechanical method.
• To enable the simultaneous description of static and dynamical electron correlation.
• To address limitations in current multiconfigurational electronic structure calculations.

Main Methods:

• A hybrid approach combining the density matrix renormalization group (DMRG) with density functional theory (DFT).
• Utilizes the concept of range-separation to integrate these methods.
• Applies to multiconfigurational electronic structure problems.

Main Results:

• The new method provides a unified treatment of different electron correlation regimes.
• Enables accurate calculations for challenging multiconfigurational systems.
• Demonstrates the potential for improved predictions in quantum chemistry.

Conclusions:

• The hybrid DMRG-DFT method offers a promising new avenue for electronic structure calculations.
• It effectively captures both static and dynamical electron correlation.
• This advancement can lead to more accurate modeling of complex chemical phenomena.