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Researchers enhanced the Strongly Constrained and Appropriately Normed (SCAN) approximation in electronic structure calculations by incorporating spin currents. This new JSCAN functional improves accuracy in density functional theory for molecules and materials.

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Area of Science:

  • Computational physics and chemistry
  • Electronic structure theory
  • Quantum mechanics

Background:

  • Density functional theory (DFT) is crucial for balancing accuracy and computational cost in electronic structure calculations.
  • The exchange-correlation energy functional is central to DFT, with approximations guided by exact conditions.
  • The Strongly Constrained and Appropriately Normed (SCAN) approximation is a successful modern example.

Purpose of the Study:

  • To incorporate explicit spin current dependence into the SCAN functional using first principles.
  • To develop a spin-current dependent generalization of the electron localization function.
  • To implement and test these new functionals in electronic structure calculations.

Main Methods:

  • Leveraging the SU(2) gauge invariance of the exchange-correlation functional in spin current density functional theory.
  • Deriving new functionals (JSCAN and JELF) based on first principles.
  • Implementing the extended functionals in a developer's version of the crystal23 program.

Main Results:

  • Successfully derived and implemented JSCAN, a SCAN functional with explicit spin current dependence.
  • Developed JELF, a spin-current dependent generalization of the electron localization function.
  • Confirmed the practical relevance of the extended functionals through applications on molecules and materials.

Conclusions:

  • The SU(2) gauge invariance provides a first-principles route to include spin currents in DFT functionals.
  • The new JSCAN and JELF functionals offer enhanced accuracy for systems with spin currents.
  • These extensions represent a significant advancement in electronic structure computations for materials science.