Formation and stabilization of Fe-induced magic clusters on Si(111)-(7 x 7) template

被引：15

作者：

Zilani, M. A. K. ^{[1
]}

Sun, Y. Y. ^{[1
]}

Xu, H. ^{[1
]}

Peng, G. W. ^{[1
]}

Feng, Y. P. ^{[1
]}

Wang, X. -S. ^{[1
]}

Wee, A. T. S. ^{[1
]}

机构：

[1] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

来源：

SURFACE SCIENCE | 2007年 / 601卷 / 12期

关键词：

nanostructures; self-assembly; scanning tunneling microscopy; silicon; iron; density functional calculations;

D O I：

10.1016/j.susc.2007.04.181

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We demonstrate the growth of Fe-induced magic clusters on Si(111)-(7 x 7) template by in situ scanning tunneling microscopy (STM). These clusters form near a dimer row at one side of the half-unit cell (HUC); and with three different equivalent orientations. A cluster model comprising three top layer Si atoms bonded to six Fe atoms at the next layer in the 7 x 7 faulted-half template is proposed. The optimized cluster structure determined by first-principles total-energy calculation shows an inward-shifting of the three center Fe atoms. The clusters and the nearby center-adatoms of the next HUCs appear with a significantly reduced height below bias voltages 0.4 V in high resolution empty-state STM images, suggesting an energy gap opening near the Fermi level at these localized cluster and adatom sites. We explain the stabilization of the clusters on the 7 x 7 template using the gain in electronic energy as the driving force for cluster formation. (c) 2007 Published by Elsevier B.V.

引用

页码：2486 / 2490

页数：5

共 38 条

[11] ELECTRONIC SHELL STRUCTURE AND ABUNDANCES OF SODIUM CLUSTERS [J].

KNIGHT, WD ;

CLEMENGER, K ;

DEHEER, WA ;

SAUNDERS, WA ;

CHOU, MY ;

COHEN, ML .

PHYSICAL REVIEW LETTERS, 1984, 52 (24) :2141-2143

[12] Doping of magic nanoclusters in the submonolayer In/Si(100) system [J].

Kotlyar, VG ;

Zotov, AV ;

Saranin, AA ;

Chukurov, EN ;

Kasyanova, TV ;

Cherevik, MA ;

Pisarenko, IV ;

Okado, H ;

Katayama, M ;

Oura, K ;

Lifshits, VG .

PHYSICAL REVIEW LETTERS, 2003, 91 (02)

[13] Formation of the ordered array of Al magic clusters on Si(111)7x7 [J].

Kotlyar, VG ;

Zotov, AV ;

Saranin, AA ;

Kasyanova, TV ;

Cherevik, MA ;

Pisarenko, IV ;

Lifshits, VG .

PHYSICAL REVIEW B, 2002, 66 (16) :1-4

[14] Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set [J].

Kresse, G ;

Furthmuller, J .

PHYSICAL REVIEW B, 1996, 54 (16) :11169-11186

[15] Self-organized two-dimensional lattice of magic clusters [J].

Lai, MY ;

Wang, YL .

PHYSICAL REVIEW B, 2001, 64 (24)

[16] Gallium-induced nanostructures on Si(111): From magic clusters to incommensurate structures [J].

Lai, MY ;

Wang, YL .

PHYSICAL REVIEW B, 1999, 60 (03) :1764-1770

[17] Direct observation of two dimensional magic clusters [J].

Lai, MY ;

Wang, YL .

PHYSICAL REVIEW LETTERS, 1998, 81 (01) :164-167

[18] Spontaneous assembly of perfectly ordered identical-size nanocluster arrays [J].

Li, JL ;

Jia, JF ;

Liang, XJ ;

Liu, X ;

Wang, JZ ;

Xue, QK ;

Li, ZQ ;

Tse, JS ;

Zhang, ZY ;

Zhang, SB .

PHYSICAL REVIEW LETTERS, 2002, 88 (06) :66101/1-66101/4

[19] Borderline magic clustering: The fabrication of tetravalent Pb cluster arrays on Si(111)-(7x7) surfaces [J].

Li, SC ;

Jia, JF ;

Dou, RF ;

Xue, QK ;

Batyrev, IG ;

Zhang, SB .

PHYSICAL REVIEW LETTERS, 2004, 93 (11) :116103-1

[20] Interaction of Sn atoms with the intrinsic dangling-bond states of Si(111)-(7x7) [J].

Lin, XF ;

Chizhov, I ;

Mai, HA ;

Willis, RF .

SURFACE SCIENCE, 1996, 366 (01) :51-59

← 1 2 3 4 →