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Shikin, A. M.*; Estyunin, D. A.*; Klimovskikh, I. I.*; Filnov, S. O.*; Kumar, S.*; Schwier, E. F.*; Miyamoto, Koji*; Okuda, Taichi*; Kimura, Akio*; Kuroda, Kenta*; et al.
Scientific Reports (Internet), 10, p.13226_1 - 13226_13, 2020/08
Times Cited Count：59 Percentile：96.43(Multidisciplinary Sciences)Mochizuki, Izumi; Fukaya, Yuki; Kawasuso, Atsuo; Yaji, Koichiro*; Harasawa, Ayumi*; Matsuda, Iwao*; Wada, Ken*; Hyodo, Toshio*
Physical Review B, 85(24), p.245438_1 - 245438_6, 2012/06
Times Cited Count：19 Percentile：61.1(Materials Science, Multidisciplinary)The atomic configuration and electronic band structure of Pt-induced nanowires on a Ge(001) surface are investigated using scanning tunneling microscopy, reflection high-energy positron diffraction, and angle-resolved photoemission spectroscopy. A previously proposed theoretical model, composed of Ge dimers on the top layer and buried Pt arrays in the second and fourth layers, is found to be the fundamental structure of the observed nanowires. At low temperatures (
80 K), each Ge dimer is alternately tilted in the surface normal direction (asymmetric), causing a p(
) periodicity. At high temperatures ( 
110 K), each Ge dimer is flat with respect to the horizontal axis (symmetric), giving rise to p (
) periodicity. Upon the above phase transition, the electronic band dispersion related to the Ge dimers in the deeper energy region shifts to the Fermi level.
Mochizuki, Izumi; Fukaya, Yuki; Kawasuso, Atsuo; Yaji, Koichiro*; Harasawa, Ayumi*; Matsuda, Iwao*; Wada, Ken*; Hyodo, Toshio*
no journal, ,
Defect-free quasi-one chain with the single atomic width is reconstructed on the Ge(001) surface by a Pt adsorption of sub-atomic layer. Recently, it has been reported that the atomic chain undergoes the Peierls transition about 80 K. But, the electronic property, the atomic arrangements and displacements in the phase transition are not yet elucidated. Using reflection high-energy positron diffraction (RHEPD), we have reported that the Nano-Wire (NW) model is the fundamental structure of the observed nanowires. In this study, we have tried to determine the atomic arrangement and the transition phenomenon using RHEPD. The rocking curve shows a good agreement with the calculated curve assuming the NW model with the Pt coverage of 0.75 ML. In addition, the change of rocking curves in the phase transition shows that the structural phase transition is caused by the height difference of the topmost Ge dimer atoms.
Mochizuki, Izumi*; Fukaya, Yuki; Maekawa, Masaki; Kawasuso, Atsuo; Yaji, Koichiro*; Harasawa, Ayumi*; Matsuda, Iwao*; Wada, Ken*; Hyodo, Toshio*
no journal, ,
no abstracts in English
Mochizuki, Izumi*; Yaji, Koichiro*; Fukaya, Yuki; Wada, Ken*; Hyodo, Toshio*; Maekawa, Masaki; Kawasuso, Atsuo; Harasawa, Ayumi*; Matsuda, Iwao*
no journal, ,
no abstracts in English
