Plasmons in Pb nanowire arrays on Si(557): Between one and two dimensions

被引：18
作者：
Block, T. [1 ]
Tegenkamp, C. [1 ]
Baringhaus, J. [1 ]
Pfnuer, H. [1 ]
Inaoka, T. [2 ]
机构：
[1] Leibniz Univ Hannover, Inst Festkorperphys, DE-30167 Hannover, Germany
[2] Univ Ryukyus, Fac Sci, Dept Phys & Earth Sci, Okinawa 9030213, Japan
来源：
PHYSICAL REVIEW B | 2011年 / 84卷 / 20期
关键词：
QUANTUM CHAINS; ELECTRON-GAS; SURFACE; MONOLAYER;
D O I：
10.1103/PhysRevB.84.205402
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The plasmon dispersion in arrays of nanowires of Pb close to an average Pb coverage of one monolayer was determined on the Si(557) surface using electron energy loss spectroscopy with both high energy and momentum resolution. While we find purely one-dimensional (1D) plasmon losses at a Pb concentration of 1.31 monolayers (ML), measured with respect to the Si(111) surface concentration, the 1.2 and 1.4 ML coverages exhibit wavelength-dependent transitions from 1D to anisotropic 2D properties. However, due to the high anisotropy in the system at all coverages, the dispersion curves exhibit 1D characteristics in both directions. This behavior seems to be related to the Pb-induced refacetting of the Si(557) surface, which depends on Pb coverage. It changes both effective system sizes and coupling strength between miniterraces.
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页数：8
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