Observation of depolarized ZnO(0001) monolayers: Formation of unreconstructed planar sheets

被引：690

作者：

Tusche, C. ^{[1
]}

Meyerheim, H. L. ^{[1
]}

Kirschner, J. ^{[1
]}

机构：

[1] Max Planck Inst Mikrostrukturphys, D-06120 Halle, Germany

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.99.026102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A novel nonpolar structure of 2 monolayer (ML) thick ZnO(0001) films grown on Ag(111) has been revealed, using surface x-ray diffraction and scanning tunneling microscopy. Zn and O atoms are arranged in planar sheets like in the hexagonal boron-nitride prototype structure. The observed depolarization is accompanied by a significant lateral 1.6% expansion of the lattice parameter and a 3% reduced Zn-O bond length within the sheets. The nonpolar structure stabilizes an atomically flat surface morphology unseen for ZnO surfaces thus far. The transition to the bulk wurtzite structure occurs in the 3-4 ML coverage range, connected to considerable roughening.

引用

页数：4

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