Computing the Optical Properties of Large Systems by Tim Joachim Zuehlsdorff

By Tim Joachim Zuehlsdorff

This paintings addresses the computation of excited-state houses of platforms containing millions of atoms. to accomplish this, the writer combines the linear reaction formula of time-dependent density sensible concept (TDDFT) with linear-scaling options identified from ground-state density-functional conception. This extends the diversity of TDDFT, which by itself can't take on a number of the huge and engaging platforms in fabrics technological know-how and computational biology. The strengths of the strategy built during this paintings are established on a few difficulties related to large-scale structures, together with exciton coupling within the Fenna-Matthews-Olson complicated and the research of low-lying excitations in doped p-terphenyl natural crystals.

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Extra info for Computing the Optical Properties of Large Systems

Sample text

The asymptotic localisation of Wannier functions has been discussed for a number of years [26]. While it had long been proven that Wannier functions and generalised Wannier functions are exponentially localised in 1D [27, 28], in 3D the proof only existed for isolated bands [28, 29]. Recently, it has been shown that generalised Wannier functions spanning the composite bands corresponding to the occupied states in a 3D insulator with time-reversal symmetry are exponentially localised [30]. 3 Basis Functions The most effective way of solving the Kohn–Sham Hamiltonian for its eigenstates depends on the type of system of interest.

2 From Theory to Practical Method 37 representable by only few plane waves, harder pseudopotentials with small rc are much more reliable when being transferred to different chemical environments. 7 Projector Augmented-Wave Formalism While the norm-conserving pseudopotential approach is relatively simple and intuitive, it comes with a number of drawbacks. First, many transition metals require the explicit treatment of semi-core states as valence states in order to achieve satisfactory agreements with experimental data, resulting in very hard pseudopotentials.

B 23, 5048 (1981) 17. : Accurate and simple analytic representation of the electron-gas correlation energy. Phys. Rev. B 45, 13244 (1992) 18. : Perspective: fifty years of density-functional theory in chemical physics. J. Chem. Phys. 140, 18A301 (2014) 19. : Density functional calculations of molecular bond energies. J. Chem. Phys. 84, 4524 (1986) 20. : Accurate and simple density functional for the electronic exchange energy: generalized gradient approximation. Phys. Rev. B 33, 8800 (1986) 21.

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