Adsorption structure of germanium on the Ru(0 0 0 1) surface |
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Authors: | Y.H. Lu H.J. Zhang H.Y. Li P. He |
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Affiliation: | a Department of Physics, Zhejiang University, Hangzhou 310027, China b School of Physics and Engineering, Zhengzhou University, Zhengzhou 450052, China |
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Abstract: | Coverage-dependent adsorption energy of the Ge/Ru(0 0 0 1) growth system and the geometrical distortions of the most stable adsorption structure are investigated through first-principles calculations within density functional theory. A local minimum in adsorption energy is found to be at a Ge coverage of 1/7 monolayer with a Ru(0 0 0 1)- symmetry. Based on this stale superstructure, the scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) images are simulated by means of surface local-density of states (LDOS). The results are consistent well with the STM measurements on the phase for Ge overlayer on Ru(0 0 0 1). From this stimulation, the relations between the STM images and the lattice distortion are also clarified. |
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Keywords: | 71.15.Mb 68.37.Ef 68.03.Hj |
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