Nanotechnology exploits the properties of materials on a nanometric scale, (a nanometer is one millionth of a millimeter). The ultimate limit for such miniaturization is the development of devices formed by atomic structures created artificially to fulfil a determined purpose.
The tools that permit the visualization and manipulation of atoms are called proximity microscopes. This includes the Scanning Tunneling Microscope (STM), whose development in 1986 earned G. Binning and H. Rohrer the Novel prize for physics, and more recently the Atomic Force Microscope (AFM).
In a study published in Science magazine, an international team of scientists, including researchers from the Theoretical Condensed Matter Physics department at the Universidad Autónoma de Madrid, present a new method for the manipulation of atoms based on the AFM that makes it possible to build stable atomic structures at room temperature .
Thanks to numerical simulations based on quantum mechanics that require the use of supercomputers it has also been possible to explain the basic atomic mechanism behind this process and determine the conditions under which it takes place.
This new manipulation scheme drastically reduces the time necessary to realize complex atomic structures. It can even be used at room temperature and has been proven to work on various semiconductor surfaces. Therefore, this method opens new perspectives in fields like Material Science, Nanotechnology, Molecular Electronics and Spintronics. In particular, the combination of the capacity of the AFM to manipulate individual atoms on surfaces with the possibility of identifying the chemical element. This was demonstrated by the same team in an article published in last year's Nature and will enable the construction of nanostructures with properties and functionalities specified to improve the yield of electronic devices.
For example, placing specific dopant elements in the best position on semi-conductive surfaces to increase the efficiency of nanometric transistors or magnetic atoms would open the possibility of developing devices based on the control of the spin of an electron. These techniques could also bring the possibility of “nano-facturing” of qbits, which are the basic components of what could eventually become a quantum computer. Complex Patterning by Vertical Interchange Atom Manipulation Using Atomic Force Microscopy.
Science, Vol. 322, pp 413-417 (17 October 2008)1 Graduate School of Engineering, Osaka University, 2-1 Yamada-Oka, 565-0871 Suita, Osaka, Japan.
4 Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnicka 10, 1862 53, Prague, Czech Republic.
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