Muthanna Journal of Pure Sciences – MJPS
VOL.(3), NO.(1), 2016
Sabah Mohammed Mlkat AL-Mutoki
Electrical Department, Foundation Of Technical Education, Technical Institute Of Shatrah, ThiQar, Iraq
In this paper, we have discussed transistors made from single molecules in which one silver ion is connected to gold electrodes by organic barriers. By tuning the length of the organic barrier we are able to control the coupling between the ion and the electrodes. For relatively long linker molecules, giving weak coupling, the molecule functions as a quantum dot. This work shows that the properties of a molecular transistor can be controlled by the physical properties of the molecule .The ability to design the electronic states of a molecular device using (SIESTA and Smeagol), together with the ability to measure individual molecules, will play an important role in molecular electronics and in the physics of nanometer-scale systems. This paper is also to study electron transport in nanoscale objects,
especially the devices made from single molecules. We show that the qualitative features of this interference effect arecaptured by the Smeagol COD described above through an appropriate choice of parameters. Finally, we note that quantum interference in such multibranch structures leads tothe appearance of large, internal countercurrents, which exceedthe external current carried by the electrodes, these calculations presented in this work were processing in Centre for Nanoscale Dynamics and Mathematical Modeling in the Lancaster universe uk .