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Cooperative Electron-Phonon Coupling and Buckled Structure in Germanene on Au(111)

Journal Article


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Abstract


  • Germanene, a single-atom-thick germanium nanosheet in a honeycomb lattice, was proposed to be a Dirac fermion material beyond graphene. We performed scanning tunneling microscopy and in situ Raman spectroscopy studies combined with first-principles calculations on the atomic structures and the electronic and phonon properties of germanene on Au(111). The low-buckled 1 × 1 germanene honeycomb lattice was determined to exist in an unexpected rectangular √7 × √7 superstructure. Through in situ Raman measurements, distinctive vibrational phonon modes were discovered in √7 × √7 germanene, revealing the special coupling between the Dirac fermion and lattice vibrations, namely, electron–phonon coupling (EPC). The significant enhancement of EPC is correlated with the tensile strain, which is evoked by the singular buckled structure of √7 × √7 germanene on the Au(111) substrate. Our results present clear evidence for the existence of epitaxial germanene and elucidate the exotic properties of germanene on Au(111).

Authors


  •   Zhuang, Jincheng (external author)
  •   Guo, Nan (external author)
  •   Li, Zhi
  •   Xu, Xun
  •   Wang, Jiaou (external author)
  •   Zhao, Jijun (external author)
  •   Dou, Shi Xue
  •   Du, Yi

Publication Date


  • 2017

Citation


  • Zhuang, J., Guo, N., Li, Z., Xu, X., Wang, J., Zhao, J., Dou, S. Xue. & Du, Y. (2017). Cooperative Electron-Phonon Coupling and Buckled Structure in Germanene on Au(111). ACS Nano, 11 (4), 3553-3559.

Scopus Eid


  • 2-s2.0-85018639179

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3476&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2452

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 3553

End Page


  • 3559

Volume


  • 11

Issue


  • 4

Place Of Publication


  • United States

Abstract


  • Germanene, a single-atom-thick germanium nanosheet in a honeycomb lattice, was proposed to be a Dirac fermion material beyond graphene. We performed scanning tunneling microscopy and in situ Raman spectroscopy studies combined with first-principles calculations on the atomic structures and the electronic and phonon properties of germanene on Au(111). The low-buckled 1 × 1 germanene honeycomb lattice was determined to exist in an unexpected rectangular √7 × √7 superstructure. Through in situ Raman measurements, distinctive vibrational phonon modes were discovered in √7 × √7 germanene, revealing the special coupling between the Dirac fermion and lattice vibrations, namely, electron–phonon coupling (EPC). The significant enhancement of EPC is correlated with the tensile strain, which is evoked by the singular buckled structure of √7 × √7 germanene on the Au(111) substrate. Our results present clear evidence for the existence of epitaxial germanene and elucidate the exotic properties of germanene on Au(111).

Authors


  •   Zhuang, Jincheng (external author)
  •   Guo, Nan (external author)
  •   Li, Zhi
  •   Xu, Xun
  •   Wang, Jiaou (external author)
  •   Zhao, Jijun (external author)
  •   Dou, Shi Xue
  •   Du, Yi

Publication Date


  • 2017

Citation


  • Zhuang, J., Guo, N., Li, Z., Xu, X., Wang, J., Zhao, J., Dou, S. Xue. & Du, Y. (2017). Cooperative Electron-Phonon Coupling and Buckled Structure in Germanene on Au(111). ACS Nano, 11 (4), 3553-3559.

Scopus Eid


  • 2-s2.0-85018639179

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3476&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2452

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 3553

End Page


  • 3559

Volume


  • 11

Issue


  • 4

Place Of Publication


  • United States