Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/6349
Title: 2D vibrational properties of epitaxial silicene on Ag(111)
Authors: Solonenko, Dmytro
Gordan, Ovidiu D.
Le Lay, Guy
Şahin, Hasan
Cahangirov, Seymur
Zahn, Dietrich R. T.
Vogt, Patrick
Şahin, Hasan
Izmir Institute of Technology. Photonics
Keywords: Ab initio theory
Epitaxial silicene
Phonon modes
Raman spectroscopy
Issue Date: Mar-2017
Publisher: IOP Publishing Ltd.
Source: Solonenko, D., Gordan, O. D., Le Lay, G., Şahin, H., Cahangirov, S., Zahn, D. R. T., and Vogt, P. (2017). 2D vibrational properties of epitaxial silicene on Ag(111). 2D Materials, 4(1). doi:10.1088/2053-1583/4/1/015008
Abstract: The two-dimensional silicon allotrope, silicene, could spur the development of new and original concepts in Si-based nanotechnology. Up to now silicene can only be epitaxially synthesized on a supporting substrate such as Ag(111). Even though the structural and electronic properties of these epitaxial silicene layers have been intensively studied, very little is known about its vibrational characteristics. Here, we present a detailed study of epitaxial silicene on Ag(111) using in situ Raman spectroscopy, which is one of the most extensively employed experimental techniques to characterize 2D materials, such as graphene, transition metal dichalcogenides, and black phosphorous. The vibrational fingerprint of epitaxial silicene, in contrast to all previous interpretations, is characterized by three distinct phonon modes with A and E symmetries. Both, energies and symmetries of theses modes are confirmed by ab initio theory calculations. The temperature dependent spectral evolution of these modes demonstrates unique thermal properties of epitaxial silicene and a significant electron-phonon coupling. These results unambiguously support the purely two-dimensional character of epitaxial silicene up to about 300°C, whereupon a 2D-to-3D phase transition takes place. The detailed fingerprint of epitaxial silicene will allow us to identify it in different environments or to study its modifications.
URI: http://doi.org/10.1088/2053-1583/4/1/015008
http://hdl.handle.net/11147/6349
ISSN: 2053-1583
2053-1583
Appears in Collections:Photonics / Fotonik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Sürdürülebilir Yeşil Kampüs Koleksiyonu / Sustainable Green Campus Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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