Detail publikace

Highly Biaxially Strained Silicene on Au(111)

NAZZARI, D. GENZER, J. RITTER, V. BETHGE, O. BERTAGNOLLI, E. RAMER, G. LENDL, B. WATANABE, K. TANIGUCHI, T. RURALI, R. KOLÍBAL, M. LUGSTEIN, A.

Anglický název

Highly Biaxially Strained Silicene on Au(111)

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

en

Originální abstrakt

Many of graphene's remarkable properties arise from its linear dispersion of the electronic states, forming a Dirac cone at the K points of the Brillouin zone. Silicene, the 2D allotrope of silicon, is also predicted to show a similar electronic band structure, with the addition of a tunable bandgap, induced by spin-orbit coupling. Because of these outstanding electronic properties, silicene is considered as a promising building block for next-generation electronic devices. Recently, it has been shown that silicene grown on Au(111) still possesses a Dirac cone, despite the interaction with the substrate. Here, to fully characterize the structure of this 2D material, we investigate the vibrational spectrum of a monolayer silicene grown on Au(111) by polarized Raman spectroscopy. To enable a detailed ex situ investigation, we passivated the silicene on Au(111) by encapsulating it under few layers hBN or graphene flakes. The observed spectrum is characterized by vibrational modes that are strongly red-shifted with respect to the ones expected for freestanding silicene. By comparing low-energy electron diffraction (LEED) patterns and Raman results with first-principles calculations, we show that the vibrational modes indicate a highly (>7%) biaxially strained silicene phase.

Anglický abstrakt

Many of graphene's remarkable properties arise from its linear dispersion of the electronic states, forming a Dirac cone at the K points of the Brillouin zone. Silicene, the 2D allotrope of silicon, is also predicted to show a similar electronic band structure, with the addition of a tunable bandgap, induced by spin-orbit coupling. Because of these outstanding electronic properties, silicene is considered as a promising building block for next-generation electronic devices. Recently, it has been shown that silicene grown on Au(111) still possesses a Dirac cone, despite the interaction with the substrate. Here, to fully characterize the structure of this 2D material, we investigate the vibrational spectrum of a monolayer silicene grown on Au(111) by polarized Raman spectroscopy. To enable a detailed ex situ investigation, we passivated the silicene on Au(111) by encapsulating it under few layers hBN or graphene flakes. The observed spectrum is characterized by vibrational modes that are strongly red-shifted with respect to the ones expected for freestanding silicene. By comparing low-energy electron diffraction (LEED) patterns and Raman results with first-principles calculations, we show that the vibrational modes indicate a highly (>7%) biaxially strained silicene phase.

Klíčová slova anglicky

Layers; Oscillation; Silicon; Diffraction; Polarization

Vydáno

04.05.2021

Nakladatel

AMER CHEMICAL SOC

Místo

WASHINGTON

ISSN

1932-7455

Ročník

125

Číslo

18

Strany od–do

9973–9980

Počet stran

8

BIBTEX


@article{BUT171815,
  author="Miroslav {Kolíbal},
  title="Highly Biaxially Strained Silicene on Au(111)",
  year="2021",
  volume="125",
  number="18",
  month="May",
  pages="9973--9980",
  publisher="AMER CHEMICAL SOC",
  address="WASHINGTON",
  issn="1932-7455"
}