Journal
ACS NANO
Volume 9, Issue 5, Pages 5318-5325Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b00840
Keywords
lateral vacancy manipulation; scanning tunneling microscope; density functional theory; vacancy-vacancy interaction; ultrathin insulating films
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Funding
- Research Foundation-Flanders (FWO, Belgium)
- Flemish Concerted Action (BOF KU Leuven) research program [GOA/14/007]
- Italian MIUR (FIRB) [RBAP115AYN]
- China Scholarship Council [2011624021]
- FWO
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During the last 20 years, using scanning tunneling microscopy (STM) and atomic force microscopy, scientists have successfully achieved vertical and lateral repositioning of individual atoms on and in different types of surfaces. Such atom manipulation allows the bottom-up assembly of novel nanostructures that can otherwise not be fabricated. It is therefore surprising that controlled repositioning of virtual atoms, i.e., atomic vacancies, across atomic lattices has not yet been achieved experimentally. Here we use STM at liquid helium temperature (4.5 K) to create individual Cl vacancies and subsequently to laterally manipulate them across the surface of ultrathin sodium chloride films. This allows monitoring the interactions between two neighboring vacancies with different separations. Our findings are corroborated by density functional theory calculations and STM image simulations. The lateral manipulation of atomic vacancies opens up a new playground for the investigation of fundamental physical properties of vacancy nanostructures of any size and shape and their coupling with the supporting substrate, and of the interaction of various deposits with charged vacancies.
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