Alkali metal-induced Si(1 1 1) structure: The Na case |
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| Authors: | M D&#x;angelo M Konishi I Matsuda C Liu S Hasegawa T Okuda T Kinoshita |
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| Institution: | aDepartment of Physics, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;bSynchrotron Radiation Laboratory, Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581, Japan |
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| Abstract: | We report the first scanning tunneling microscopy (STM) and core-level photoemission (CL-PES) studies of a structure induced by sub-monolayer Na deposition on the Si(1 1 1) surface. In the filled-state STM images, five bright protrusions in the unit cell are located on the Ag trimers of the structure. The Si 2p core-level photoemission decomposition shows that the surface-shifted component originated from the Si-trimer atoms in the surface splits into two for the structure, which are attributed to the Si-trimer atoms in the unit cell which are affected and unaffected by the Na adsorption. These results show strong similarities between the Na-induced superstructure and the noble metal-induced ones, indicating a common atomic structure and formation mechanism. |
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| Keywords: | Scanning tunneling microscopy Photoelectron spectroscopy Surface reconstructions Silicon Silver Sodium |
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