TY - JOUR
T1 - Asymmetric structure of germanene on an Al(111) surface studied by total-reflection high-energy positron diffraction
AU - Fukaya, Yuki
AU - Matsuda, Iwao
AU - Feng, Baojie
AU - Mochizuki, Izumi
AU - Hyodo, Toshio
AU - Shamoto, Shin Ichi
N1 - Publisher Copyright:
© 2016 IOP Publishing Ltd.
PY - 2016/9/8
Y1 - 2016/9/8
N2 - The structure of germanene on an Al(111) surface has been experimentally investigated using the total-reflection high-energy positron diffraction (TRHEPD) method. The observed spot intensities are asymmetric, revealing no mirror symmetry in the atomic coordinates of germenene with respect to the 〈110〉 direction. Quantitative TRHEPD rocking curve analysis, based on dynamical diffraction theory, has revealed that the germanene layer has a 3×3 structure with asymmetrical buckling due to the protrusion of one of the Ge atoms in the unit cell, which is unlike the structural model proposed in previous studies. The magnitude of the buckling was found to be 0.94 A, and the spacing between the germanene and the Al(111) substrate to be 2.51 A. The new structure proposed in the present investigations, though different from that reported in studies before, does not contradict the other characteristics which were found experimentally in the previous studies.
AB - The structure of germanene on an Al(111) surface has been experimentally investigated using the total-reflection high-energy positron diffraction (TRHEPD) method. The observed spot intensities are asymmetric, revealing no mirror symmetry in the atomic coordinates of germenene with respect to the 〈110〉 direction. Quantitative TRHEPD rocking curve analysis, based on dynamical diffraction theory, has revealed that the germanene layer has a 3×3 structure with asymmetrical buckling due to the protrusion of one of the Ge atoms in the unit cell, which is unlike the structural model proposed in previous studies. The magnitude of the buckling was found to be 0.94 A, and the spacing between the germanene and the Al(111) substrate to be 2.51 A. The new structure proposed in the present investigations, though different from that reported in studies before, does not contradict the other characteristics which were found experimentally in the previous studies.
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U2 - 10.1088/2053-1583/3/3/035019
DO - 10.1088/2053-1583/3/3/035019
M3 - Article
AN - SCOPUS:84992416944
SN - 2053-1583
VL - 3
JO - 2D Materials
JF - 2D Materials
IS - 3
M1 - 035019
ER -