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Electrical response of molecular chains from density functional theory.

Stephan Kümmel1, Leeor Kronik, John P Perdew

  • 1Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Strasse 38, D-01187 Dresden, Germany.

Physical Review Letters
|December 17, 2004
PubMed
Summary

Accurate electrical response in molecular chains requires the exact exchange energy in Kohn-Sham density-functional theory. Approximations may fail due to potential barriers affecting electron mobility.

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Area of Science:

  • Computational chemistry
  • Condensed matter physics
  • Quantum mechanics

Background:

  • Local and semilocal density functionals significantly overestimate the electrical response of molecular chains.
  • Accurate prediction of electronic properties is crucial for materials science and device design.

Purpose of the Study:

  • To investigate the accuracy of Kohn-Sham density-functional theory (KS-DFT) for calculating linear and nonlinear polarizabilities of molecular chains.
  • To identify the reasons for inaccuracies in approximate density functionals regarding electrical response properties.

Main Methods:

  • Employing the exact exchange energy within KS-DFT.
  • Utilizing the corresponding exact Kohn-Sham potential (upsilonx(r)).
  • Comparing results with approximate exchange potentials.

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Main Results:

  • KS-DFT with exact exchange energy accurately predicts linear and nonlinear polarizabilities.
  • Approximations to upsilonx(r), even if accurate for ground-state energy, can fail for response properties.
  • Potential barriers, impactful for electron mobility, are identified as a key factor in response inaccuracies.

Conclusions:

  • The exact exchange energy is essential for accurate electrical response calculations in molecular chains using KS-DFT.
  • Careful consideration of potential barriers is necessary when developing approximate functionals for electronic response.
  • This work provides a pathway towards more reliable computational predictions of molecular electrical properties.