Calculation of surface core-level shifts within complete screening : Problems with pseudohydrogenated slabs

• By considering GaAs(110) and Si(100)(2x1) surfaces, it is shown that the use of the pseudohydrogen atoms to saturate the dangling bonds at one side of the slab modeling a free surface can lead to distorted surface core-level shifts within the complete screening picture. The effect is linked to the polarization of the slab and to the change in the bulklike electronic structure close to pseudohydrogenated part of the slab. It is demonstrated that these problems can be avoided if the pseudohydrogenated slab is large enough and the bulk reference layer is properly chosen. One easy way to control these errors is to monitor the planar-averaged potential energy curve of the slab.

Ämnesord

NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Nyckelord

total-energy calculations

augmented-wave method

electronic-structure

molecular-dynamics

basis-set

reconstructions

gaas(110)

geometry

transition

density

Physics

Publikations- och innehållstyp

ref (ämneskategori)

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