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Epitaxial silicene and other Si-structures on Ag(111) investigated by in situ Raman spectroscopy

par Caroline CHAMPENOIS - publié le

séminaire du laboratoire
mardi 7 mars, 11:00 service 322 campus Saint-Jérôme

Patrick Vogt

Technische Universität Chemnitz, Physics Department,
Reichenhainer Straße 7009126 Chemnitz, Germany

abstract :

Silicene, a new silicon allotrope with a graphene-like honeycomb structure, has attracted considerable interest, because its topology confers to it the same remarkable electronic properties as those of graphene. But silicene does not exist in nature and has to be synthesized on a supporting substrate such as Ag(111), which was successfully done in 2012.However, various different 2D Si-structure have been reported to form on this substrate surface and their structure and properties have been discussed controversially in the literature.
In this talk the formation of epitaxial silicene and other Si-forms on the Ag(111) surface will be discussed, based on in situ Raman investigations. These results unambiguously demonstrate the 2D character of epitaxial silicene and also show that depending on the growth conditions structural changes occur. Furthermore, the structure of the 2D layers also changes by adsorption of hydrogen which leads to significant changes of the related vibrational properties.

contact : Guy Lelay

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