Title:	Evaluating Hellmann-Feynman forces within non-local pseudopotentials
Authors:	Novák, Matyáš Vackář, Jiří Cimrman, Robert
Citation:	NOVÁK, M., VACKÁŘ, J., CIMRMAN, R. Evaluating Hellmann-Feynman forces within non-local pseudopotentials. Computer physics communications, 2020, roč. 250, č. MAY 2020. ISSN 0010-4655.
Issue Date:	2020
Publisher:	Elsevier
Document type:	článek postprint article postprint
URI:	2-s2.0-85076526855 http://hdl.handle.net/11025/37042
ISSN:	0010-4655
Keywords in different language:	Hellmann–Feynman forces;Separable pseudopotentials;Density functional theory;Convergence Real-space;Finite element method
Abstract in different language:	A new approach for evaluating Hellmann–Feynman forces within a non-local potential is introduced. Particularly, the case of Hellmann–Feynman theorem applied within density functional theory in combination with nonlocal ab-initio pseudopotentials, discretized by the finite-element method, is discussed in detail. The validity of the new approach is verified using test calculations on simple molecules and the convergence properties (w.r.t. the DFT loop) are analyzed. A comparison to other previously published approaches to Hellmann–Feynman forces calculations is shown to document that the new approach mitigates, for -dependent as well as for separable forms of nonlocal pseudopotentials, the efficiency and/or accuracy problems arising in the methods published so far.
Rights:	Plný text není přístupný. © Elsevier
Appears in Collections:	Články / Articles Postprinty / Postprints OBD

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