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Journal Article

Random registry shifts in quasi-one-dimensional adsorbate systems

MPS-Authors
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Hansmann,  Martin
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Song,  Zhen
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Horn,  Karsten
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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PhysRevB.67.085411.pdf
(Publisher version), 403KB

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Citation

Schäfer, J., Erwin, S., Hansmann, M., Song, Z., Rotenberg, E., Kevan, S., et al. (2003). Random registry shifts in quasi-one-dimensional adsorbate systems. Physical Review B, 67(8), 085411-1-085411-5. doi:10.1103/PhysRevB.67.085411.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-112B-2
Abstract
The apparent contradiction of one-dimensional adsorbate chains on Si(111) having a 3¥2 unit cell and yet a 3¥1 diffraction pattern is resolved for the example of Ba/Si(111)-(3¥2). Random registry shifts between adsorbate chains are observed in tunneling microscopy, with very short interchain correlation lengths. Fourier analysis provides a natural explanation for a pseudo-(3¥1) diffraction pattern. Within density-functional theory such registry shifts can occur with essentially negligible energy cost, leading to entropy-driven, virtually perfect disorder. Substrate states of high symmetry and one-dimensional character are inferred to promote this phenomenon.