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Updated: Feb 11, 2026

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DMRG/FQ: A Polarizable Embedding Approach Combining Density Matrix Renormalization Group and Fluctuating Charges.

Matteo Rinaldi1, Chiara Sepali1, Alicia M Kirk1

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|February 10, 2026
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Summary
This summary is machine-generated.

This study introduces a new computational method combining Density Matrix Renormalization Group (DMRG) with a polarizable fluctuating-charge (FQ) force field to simulate electronic excited states in solution, improving accuracy for complex systems.

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Area of Science:

  • Computational Chemistry
  • Quantum Mechanics
  • Molecular Dynamics

Background:

  • Simulating electronic excited states in solution is challenging due to complex solute-solvent interactions.
  • Accurate modeling requires capturing both strong electronic correlation and solvent polarization effects.

Purpose of the Study:

  • To develop an integrated multiscale framework for simulating electronic excited states in solution.
  • To combine the strengths of Density Matrix Renormalization Group (DMRG) and polarizable fluctuating-charge (FQ) models.

Main Methods:

  • Developed a multiscale framework integrating DMRG with a polarizable FQ force field.
  • Employed QM/MM embedding with DMRG for electronic structure and FQ for solvent polarization.
  • Utilized extensive molecular dynamics sampling for solvated systems.

Main Results:

  • Achieved reliable calculations of excitation energies and solvatochromic shifts.
  • Demonstrated close agreement between computational results and experimental data.
  • Highlighted the crucial role of mutual solute-solvent polarization.

Conclusions:

  • The DMRG/FQ approach accurately captures electronic excited states in solution.
  • This method is vital for understanding solute-solvent interactions, especially those involving hydrogen bonding.
  • The framework provides a robust tool for theoretical chemistry research.