Tantalum induced butterfly-like clusters on Si (111)-7 x 7 surface: STM/STS study at low coverage

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F12%3A00389054" target="_blank" >RIV/68378271:_____/12:00389054 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.susc.2011.10.017" target="_blank" >http://dx.doi.org/10.1016/j.susc.2011.10.017</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.susc.2011.10.017" target="_blank" >10.1016/j.susc.2011.10.017</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Tantalum induced butterfly-like clusters on Si (111)-7 x 7 surface: STM/STS study at low coverage

Popis výsledku v původním jazyce

The adsorption of the small amounts of Ta on Si (111)-7 7 surface is investigated using scanning tunneling microscopy and tunneling spectroscopy combined with first-principles density functional theory calculations. We find out that moderate annealing ofthe Ta covered surface results in the formation of clusters of the butterfly-like shape. The clusters are sporadically distributed over the surface and their density is metal coverage dependent. Filled and empty state STM images of the clusters differ strongly suggesting the existence of covalent bonds within the cluster. Tunneling spectroscopy measurements reveal small energy gap, showing semiconductor character. The cluster model is proposed and discussed based on theoretical calculations . Results show that Ta joins the family of adsorbates, forming magic clusters on Si(111)-7 7, but its magic cluster has the structural and electronic properties that are different from those reported before.

Název v anglickém jazyce

Tantalum induced butterfly-like clusters on Si (111)-7 x 7 surface: STM/STS study at low coverage

Popis výsledku anglicky

The adsorption of the small amounts of Ta on Si (111)-7 7 surface is investigated using scanning tunneling microscopy and tunneling spectroscopy combined with first-principles density functional theory calculations. We find out that moderate annealing ofthe Ta covered surface results in the formation of clusters of the butterfly-like shape. The clusters are sporadically distributed over the surface and their density is metal coverage dependent. Filled and empty state STM images of the clusters differ strongly suggesting the existence of covalent bonds within the cluster. Tunneling spectroscopy measurements reveal small energy gap, showing semiconductor character. The cluster model is proposed and discussed based on theoretical calculations . Results show that Ta joins the family of adsorbates, forming magic clusters on Si(111)-7 7, but its magic cluster has the structural and electronic properties that are different from those reported before.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

—

Projekt

<a href="/cs/project/IAA1010413" target="_blank" >IAA1010413: Nanověda a nanotechnologie se sondovými mikroskopy: od jevů na atomární úrovni k materiálovým vlastnostem</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Surface Science

ISSN

0039-6028

e-ISSN

—

Svazek periodika

606

Číslo periodika v rámci svazku

3-4

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

6

Strana od-do

356-361

Kód UT WoS článku

000300458600039

EID výsledku v databázi Scopus

—