{"id":2419,"date":"2015-05-27T16:51:51","date_gmt":"2015-05-27T14:51:51","guid":{"rendered":"http:\/\/www.icmm.csic.es\/esisna\/?p=2419"},"modified":"2015-05-27T16:51:51","modified_gmt":"2015-05-27T14:51:51","slug":"ultrafast-atomic-diffusion-inducing-a-reversible-transition-on-snsi111b","status":"publish","type":"post","link":"https:\/\/wp.icmm.csic.es\/esisna\/2015\/05\/27\/ultrafast-atomic-diffusion-inducing-a-reversible-transition-on-snsi111b\/","title":{"rendered":"Ultrafast atomic diffusion inducing a reversible transition on Sn\/Si(111):B"},"content":{"rendered":"

Here, we present experimental and theoretical evidence of a new reversible transition that takes place in Sn\/Si(111):B. The system changes from an insulating (2 \u221a 3 \u00d7 2 \u221a 3)R30\u00ba structure at room temperature to a (\u221a 3 \u00d7 \u221a 3)R30\u00ba symmetry above 520 K (2 \u221a 3 and \u221a 3 in the following). We explain this transition using a microscopic diffusive mechanism, where a Sn tetramer diffuses on the surface among 24 inequivalent ground states, giving rise to the \u221a 3 symmetry. This transition is reminiscent of other dynamical fluctuations transitions, but it includes as an essential novel ingredient the diffusion of Sn tetramers along the surface settling an order-disorder transition for the system.<\/p>\n

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Side and top views for the Sn\/Si(111)B-2 \u221a 3 atomic structure. Large, medium, and small balls correspond to Sn (green) and Si (orange) first and second layer atoms, respectively; small grey balls in the side view represent B atoms. Inside the unit cell (indicated by black solid lines) Sn adatoms, lateral, and central tetramer atoms are plotted in different colors (brown, blue, and purple, respectively).<\/p>\n

More information about this work<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Here, we present experimental and theoretical evidence of a new reversible transition that takes place in Sn\/Si(111):B. The system changes from an insulating (2 \u221a 3 \u00d7 2 \u221a 3)R30\u00ba structure at room temperature to a (\u221a 3 \u00d7 \u221a 3)R30\u00ba symmetry above 520 K (2 \u221a 3 and \u221a\u2026<\/p>\n

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