Publication detail

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.

Original Title

Highly Biaxially Strained Silicene on Au(111)

Type

journal article in Web of Science

Language

English

Original Abstract

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.

Keywords

Layers; Oscillation; Silicon; Diffraction; Polarization

Authors

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

Released

4. 5. 2021

Publisher

AMER CHEMICAL SOC

Location

WASHINGTON

ISBN

1932-7455

Periodical

Journal of Physical Chemistry C (web)

Year of study

125

Number

18

State

United States of America

Pages from

9973

Pages to

9980

Pages count

8

URL

https://pubs.acs.org/doi/full/10.1021/acs.jpcc.0c11033

BibTex

@article{BUT171815,
  author="Miroslav {Kolíbal}",
  title="Highly Biaxially Strained Silicene on Au(111)",
  journal="Journal of Physical Chemistry C (web)",
  year="2021",
  volume="125",
  number="18",
  pages="9973--9980",
  doi="10.1021/acs.jpcc.0c11033",
  issn="1932-7455",
  url="https://pubs.acs.org/doi/full/10.1021/acs.jpcc.0c11033"
}