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Quasi-freestanding epitaxial silicene on Ag(111) by oxygen intercalation

Journal Article


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Abstract


  • Silicene is a monolayer allotrope of silicon atoms arranged in a honeycomb structure with massless Dirac fermion characteristics similar to graphene. It merits development of silicon-based multifunctional nanoelectronic and spintronic devices operated at room temperature because of strong spin-orbit coupling. Nevertheless, until now, silicene could only be epitaxially grown on conductive substrates. The strong silicene-substrate interaction may depress its superior electronic properties. We report a quasi-freestanding silicene layer that has been successfully obtained through oxidization of bilayer silicene on the Ag(111) surface. The oxygen atoms intercalate into the underlayer of silicene, resulting in isolation of the top layer of silicene from the substrate. In consequence, the top layer of silicene exhibits the signature of a 1 × 1 honeycomb lattice and hosts massless Dirac fermions because of much less interaction with the substrate. Furthermore, the oxidized silicon buffer layer is expected to serve as an ideal dielectric layer for electric gating in electronic devices. These findings are relevant for the future design and application of silicene-based nanoelectronic and spintronic devices.

Authors


  •   Du, Yi
  •   Zhuang, Jincheng (external author)
  •   Wang, Jiaou (external author)
  •   Li, Zhi
  •   Liu, Hongsheng (external author)
  •   Zhao, Jijun (external author)
  •   Xu, Xun
  •   Feng, Haifeng
  •   Chen, Lan (external author)
  •   Wu, Kehui (external author)
  •   Wang, Xiaolin
  •   Dou, Shi Xue

Publication Date


  • 2016

Citation


  • Du, Y., Zhuang, J., Wang, J., Li, Z., Liu, H., Zhao, J., Xu, X., Feng, H., Chen, L., Wu, K., Wang, X. & Dou, S. X. (2016). Quasi-freestanding epitaxial silicene on Ag(111) by oxygen intercalation. Scientific Advances, 2 (7), e1600067-1-e1600067-7.

Scopus Eid


  • 2-s2.0-84989949699

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3188&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2167

Has Global Citation Frequency


Start Page


  • e1600067-1

End Page


  • e1600067-7

Volume


  • 2

Issue


  • 7

Place Of Publication


  • United States

Abstract


  • Silicene is a monolayer allotrope of silicon atoms arranged in a honeycomb structure with massless Dirac fermion characteristics similar to graphene. It merits development of silicon-based multifunctional nanoelectronic and spintronic devices operated at room temperature because of strong spin-orbit coupling. Nevertheless, until now, silicene could only be epitaxially grown on conductive substrates. The strong silicene-substrate interaction may depress its superior electronic properties. We report a quasi-freestanding silicene layer that has been successfully obtained through oxidization of bilayer silicene on the Ag(111) surface. The oxygen atoms intercalate into the underlayer of silicene, resulting in isolation of the top layer of silicene from the substrate. In consequence, the top layer of silicene exhibits the signature of a 1 × 1 honeycomb lattice and hosts massless Dirac fermions because of much less interaction with the substrate. Furthermore, the oxidized silicon buffer layer is expected to serve as an ideal dielectric layer for electric gating in electronic devices. These findings are relevant for the future design and application of silicene-based nanoelectronic and spintronic devices.

Authors


  •   Du, Yi
  •   Zhuang, Jincheng (external author)
  •   Wang, Jiaou (external author)
  •   Li, Zhi
  •   Liu, Hongsheng (external author)
  •   Zhao, Jijun (external author)
  •   Xu, Xun
  •   Feng, Haifeng
  •   Chen, Lan (external author)
  •   Wu, Kehui (external author)
  •   Wang, Xiaolin
  •   Dou, Shi Xue

Publication Date


  • 2016

Citation


  • Du, Y., Zhuang, J., Wang, J., Li, Z., Liu, H., Zhao, J., Xu, X., Feng, H., Chen, L., Wu, K., Wang, X. & Dou, S. X. (2016). Quasi-freestanding epitaxial silicene on Ag(111) by oxygen intercalation. Scientific Advances, 2 (7), e1600067-1-e1600067-7.

Scopus Eid


  • 2-s2.0-84989949699

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3188&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2167

Has Global Citation Frequency


Start Page


  • e1600067-1

End Page


  • e1600067-7

Volume


  • 2

Issue


  • 7

Place Of Publication


  • United States