Publication Details

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.


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 x 1 germanene honeycomb lattice was determined to exist in an unexpected rectangular √7 x √7 superstructure. Through in situ Raman measurements, distinctive vibrational phonon modes were discovered in √7 x √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 x √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).

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