Scanning tunnelling spectroscopy and Raman spectroscopy of monolayer silicene on Ag(111)

Álvarez, A. Díaz; Zhu, Taishan; Nys, J.P.; Berthe, Maxime; Empis, M.; Schreiber, J.; Grandidier, B.; Xu, Tao

doi:10.1016/j.susc.2016.06.005

Cited by 18 publications

(18 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Previous ex situ Raman results showed the presence of an “E 2 g ” mode at 516 cm −1 for the (3×3)/(4×4) phase, whereas the Raman spectrum of the “ ” structure was reported to exhibit strong bands at 521 and 900 cm −1 , interpreted as a graphene-like behaviour [ 24 ]. The in situ Raman results of epitaxial (3×3)/(4×4) silicene at one monolayer coverage from Zhuang et al [ 25 ] show bands at 230 and 530 cm −1 , while in the work of Diaz Alvarez et al [ 26 ] vibrational modes of the same structure are reported at 246 and 518.7 cm −1 . In the latter case, the Raman peak at 246 cm −1 is found at low silicene coverages.…”

Section: Resultsmentioning

confidence: 99%

Comprehensive Raman study of epitaxial silicene-related phases on Ag(111)

Solonenko¹,

Gordan²,

Lay³

et al. 2017

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

The investigation of the vibrational properties of epitaxial silicene and two-dimensional (2D) Si structures on the silver(111) surface aims for a better understanding of the structural differences and of the simplification of the seemingly complex phase diagrams reported over the last years. The spectral signatures of the main silicene phases epitaxially grown on Ag(111) were obtained using in situ Raman spectroscopy. Due to the obvious 2D nature of various epitaxial silicene structures, their fingerprints consist of similar sets of Raman modes. The reduced phase diagram also includes other Si phases, such as amorphous and crystalline silicon, which emerge on the Ag surface at low and high preparation temperatures, respectively. The Raman signatures obtained along with their interpretations provide the referential basis for further studies and for potential applications of epitaxial silicene.

show abstract

Section: Resultsmentioning

confidence: 99%

Comprehensive Raman study of epitaxial silicene-related phases on Ag(111)

Solonenko¹,

Gordan²,

Lay³

et al. 2017

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

show abstract

“…However, the vibrational properties of silicene still remains largely elusive, partially because ex-situ optical spectroscopy characterizations are hampered by the oxidation of silicene in ambient condition. So far, only a few in-situ Raman spectroscopy studies have been reported [6][7][8]. These measurements, however, failed to distinguish different phases of silicene when they coexist on the surface.…”

Section: Introductionmentioning

confidence: 99%

Vibrational Properties of a Monolayer Silicene Sheet Studied by Tip-Enhanced Raman Spectroscopy

Sheng

Cong

et al. 2017

Phys. Rev. Lett.

View full text Add to dashboard Cite

Combining ultrahigh sensitivity, spatial resolution, and the capability to resolve chemical information, tip-enhanced Raman spectroscopy (TERS) is a powerful tool to study molecules or nanoscale objects. Here we show that TERS can also be a powerful tool in studying two-dimensional materials. We have achieved a 10^{9} Raman signal enhancement and a 0.5 nm spatial resolution using monolayer silicene on Ag(111) as a prototypical 2D material system. Because of the selective enhancement on Raman modes with vertical vibrational components in TERS, our experiment provides direct evidence of the origination of Raman modes in silicene. Furthermore, the ultrahigh sensitivity of TERS allows us to identify different vibrational properties of silicene phases, which differ only in the bucking direction of the Si-Si bonds. Local vibrational features from defects and domain boundaries in silicene can also be identified.

show abstract

“…(√3×√3)R30° one at any realistic temperature. Despite all experimental efforts, however, it is only the (√3×√3)R30° configuration that always emerges with the HOPG substrate, whereas the expected variety of different reconstructions had been observed for the Si/Ag(111) system [16,17].…”

Section: Systemmentioning

confidence: 99%

The potentially crucial role of quasi-particle interferences for the growth of silicene on graphite

et al. 2020

View full text Add to dashboard Cite

A comprehensive picture of the initial stages of silicene growth on graphite is drawn. Evidence is shown that quasiparticle interferences play a crucial role in the formation of the observed silicene configurations. We propose, on one hand, that the charge modulations caused by those quantum interferences serve as templates and guide the incoming Si atoms to self-assemble to the unique (√3×√3)R30° honeycomb atomic arrangement. On the other hand, their limited extension limits the growth to about 150 Si atoms under our present deposition conditions. The here proposed electrostatic interaction finally explains the unexpected stability of the observed silicene islands over time and with temperature. Despite the robust guiding nature of those quantum interferences during the early growth phase, we demonstrate that the window of experimental conditions for silicene growth is quite narrow, making it an extremely challenging experimental task. Finally, it is shown that the experimentally observed three-dimensional silicon clusters might very well be the simple result of the end of the silicene growth resulting from the limited extent of the quasiparticle interferences. Graphical Table of Contents Charge modulations caused by quantum interferences (QI) on graphene guide Si atoms to selfassemble to the unique (√3×√3)R30° honeycomb atomic arrangement. The limited extend of those QI leads to the experimentally observed transition from 2D to 3D growth at the outskirts of the silicene islands.

show abstract

Scanning tunnelling spectroscopy and Raman spectroscopy of monolayer silicene on Ag(111)

Cited by 18 publications

References 41 publications

Comprehensive Raman study of epitaxial silicene-related phases on Ag(111)

Comprehensive Raman study of epitaxial silicene-related phases on Ag(111)

Vibrational Properties of a Monolayer Silicene Sheet Studied by Tip-Enhanced Raman Spectroscopy

The potentially crucial role of quasi-particle interferences for the growth of silicene on graphite

Contact Info

Product

Resources

About