Abstract
When a slab includes an increasing number of layers, some of its properties evolve naturally toward the corresponding ones of the bulk. In other cases, however, this correspondence must be established, as is the case, for example, of the elastic constants involving the lattice parameter orthogonal to the basal plane in the bulk, which in the latter is not defined. Other properties as the first and second hyperpolarizabilities, of the piezoelectricity and elastic tensors, in both the electronic and ionic contributions, are also included in the present work. In all cases, the corresponding property in the bulk is identified. The good agreement between the slab and bulk results documents the convergence of the former with the number of layers. It represents also an important check of the numerical accuracy of the CRYSTAL code in computing this large set of properties.
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Notes
Actually, the CPHF expression for \(\gamma ^e\) is a product of perturbed density matrices (at the first and second order of perturbation) by first (and second) derivatives of the hamiltonian with respect to the field. However, this latter first derivative of the hamiltonian also depends on the perturbed density matrix when orbital relaxation is taken into account as in CPHF and is not equal to the unique dipole moment matrix independent of the polarization as in SOS or which is rather used in the CPHF \(\alpha ^e\) expression (see Ref. [17]). Then, the number of z indices in the component of \(\gamma ^e\), indicating the power of the derivate of the energy with respect to \(F_z\), gives the power of \(\epsilon _{zz}^e\) to be used in the bulk to slab transition.
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Published as part of the special collection of articles In Memoriam of János Ángyán.
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Rérat, M., Pascale, F., Noël, Y. et al. Scalars, vectors and tensors evolving from slabs to bulk. Theor Chem Acc 137, 150 (2018). https://doi.org/10.1007/s00214-018-2360-7
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DOI: https://doi.org/10.1007/s00214-018-2360-7