Abstract
Adsorption of barium atoms on the C- and Si-faces of the 3C- 6H- and 4H-SiC polytypes is considered within the scope of the Haldane-Anderson model. Charge transfer from Ba atoms to the substrate is analyzed with the account of the band and local states of the adsorbed system. The ionic and metallic con-tributions to the adsorption energy are estimated. To improve some obtained results surface molecule model is used.
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