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Related Experiment Video

Updated: Nov 12, 2025

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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Combining wavefunction frozen-density embedding with one-dimensional periodicity.

Karin Fink1, Sebastian Höfener2

  • 1Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), P.O. Box 3630, 76021 Karlsruhe, Germany.

The Journal of Chemical Physics
|March 16, 2021
PubMed
Summary
This summary is machine-generated.

We developed a new computational method combining frozen-density embedding (FDE) with 1D periodicity for molecular systems. This approach efficiently calculates local properties in condensed matter, showing converged results with small active subsystems.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Condensed Matter Physics

Background:

  • Accurate calculation of local properties in large molecular systems is computationally demanding.
  • Existing methods often struggle with the balance between accuracy and computational cost for condensed phases.

Purpose of the Study:

  • To introduce a novel computational method combining one-dimensional periodicity with frozen-density embedding (FDE).
  • To enable efficient calculation of local properties in condensed molecular systems.
  • To assess the accuracy and convergence of the new method for various molecular properties.

Main Methods:

  • Implementation of periodic orbital-uncoupled FDE within the KOALA program.
  • Explicit computation of electron density for the active subsystem only.
  • Self-consistent relaxation of the active subsystem density in the environment potential.
  • Application to calculate ground-state dipole moments, excitation energies, and ionization potentials.

Main Results:

  • The developed method provides a fully self-consistent solution for condensed molecular systems.
  • Local properties can be calculated efficiently by treating only a small active subsystem (2-3 molecules).
  • Results are converged with respect to environmental contributions for small active subsystems.
  • The method is applicable to various quantum chemical methods like configuration interaction and time-dependent density-functional theory.

Conclusions:

  • The combination of 1D periodicity and FDE offers an efficient approach for studying local properties in condensed molecular systems.
  • The method achieves converged results with minimal active subsystems, reducing computational cost.
  • This implementation is suitable for calculating properties like dipole moments, excitation energies, and ionization potentials but not for metallic bonding due to the lack of band structure calculation.