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Identification of color centers on MgO(001) thin films with scanning tunneling microscopy

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Sterrer,  Martin
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Heyde,  Markus
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Nilius,  Niklas
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Risse,  Thomas
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Rust,  Hans-Peter
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Sterrer, M., Heyde, M., Novicki, M., Nilius, N., Risse, T., Rust, H.-P., et al. (2006). Identification of color centers on MgO(001) thin films with scanning tunneling microscopy. Journal of Physical Chemistry B, 110(1), 46-49. doi:10.1021/jp056306f.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-05B8-1
Abstract
Localized electronic defects on the surface of a 4 monolayer (ML) thin MgO(001) film deposited on Ag(001) have been investigated by low-temperature scanning tunneling microscopy and spectroscopy. Depending on the location of the defect, we observe for the first time different defect energy levels in the band gap of MgO. The charge state of defects can be manipulated by interactions with the scanning tunneling microscope tip. Comparison with ground state energy levels of color centers on the MgO surface obtained from embedded cluster calculations corroborates the assignment of the defects to singly and doubly charged color centers.