Spin Symmetry in Thermally-Assisted-Occupation Density Functional Theory

• URL: http://arxiv.org/abs/2405.09187v2
• Date: Wed, 29 May 2024 12:06:42 GMT
• Title: Spin Symmetry in Thermally-Assisted-Occupation Density Functional Theory
• Authors: Yu-Yang Wang, Jeng-Da Chai,
• Abstract summary: thermally-assisted-occupation density functional theory (TAO-DFT) has been shown to resolve the aforementioned spin-symmetry breaking. To support this, TAO-DFT calculations with various fictitious temperatures are performed for the dissociation of H2, N2, He2, and Ne2 as well as the twisted ethylene.
• Score: 3.220144298715205
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: For electronic systems with multi-reference (MR) character, Kohn-Sham density functional theory (KS-DFT) with the conventional exchange-correlation (xc) energy functionals can lead to incorrect spin densities and related properties. For example, for H2 dissociation, the spin-restricted and spin-unrestricted solutions obtained with the same xc energy functional in KS-DFT can be distinctly different, yielding the unphysical spin-symmetry breaking effects in the spin-unrestricted solutions. Recently, thermally-assisted-occupation density functional theory (TAO-DFT) has been shown to resolve the aforementioned spin-symmetry breaking, when the fictitious temperature is properly chosen. In this work, a response theory based on TAO-DFT is developed to demonstrate that TAO-DFT with a sufficiently large fictitious temperature can always resolve the unphysical spin-symmetry breaking in MR systems. To further support this, TAO-DFT calculations with various fictitious temperatures are performed for the dissociation of H2, N2, He2, and Ne2 as well as the twisted ethylene.

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