Charge compensation by long-period reconstruction in strongly polar lithium niobate surfaces

被引:25
|
作者
Sanna, S. [1 ]
Rode, S. [2 ]
Hoelscher, R. [1 ]
Klassen, S. [2 ]
Marutschke, C. [2 ]
Kobayashi, K. [3 ]
Yamada, H. [3 ]
Schmidt, W. G. [1 ]
Kuehnle, A. [2 ]
机构
[1] Univ Paderborn, Lehrstuhl Theoret Phys, D-33095 Paderborn, Germany
[2] Johannes Gutenberg Univ Mainz, Fachbereich Chem, Inst Phys Chem, D-55099 Mainz, Germany
[3] Kyoto Univ, Dept Elect Sci & Engn, Nishikyo Ku, Kyoto 6158510, Japan
关键词
POLARIZATION; SCATTERING; LINBO3;
D O I
10.1103/PhysRevB.88.115422
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The microscopic structure of the polar (000 (1) over bar) and (0001) surfaces of lithium niobate is investigated by atomic-resolution frequency modulation atomic force microscopy and first-principles calculations. It is found that the surface reconstructs at annealing temperatures sufficiently high to drive off external adsorbates. In particular a (root 7 x root 7)R19.1 degrees reconstruction is found for the (000 (1) over bar) surface. Density-functional theory calculations show that-apart from the (root 7 x root 7)-a series of adatom-induced surface reconstructions exist that lower the surface energy and reduce the surface charge.
引用
收藏
页数:5
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