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Conductance-Voltage Characteristics of Single Molecule Junction: in Resonant Tunneling Regime | ||
| Engineering and Technology Journal | ||
| Article 1, Volume 33, 5B, 2015, Pages 799-812 PDF (547.29 K) | ||
| DOI: 10.30684/etj.33.5B.5 | ||
| Authors | ||
| Fouad Nimr Ajeel1; Jenan Majeed AL-Mukh2; Lafy Faraj Al-Badry1 | ||
| 1College of Science,Thi Qar University/Thi Qar. | ||
| 2Education for Pure Sciences College /Basarh. | ||
| Abstract | ||
| Electronic transport characteristics through a single molecule junction are investigated by using the Keldysh non equilibrium Green function (NEGF) model. The model consists of a molecular bridge (represented by a molecular orbital) attached with two free electron reservoirs (represents two metallic leads) and it is coupled with a vibrational degree of freedom (represents a molecular vibrational mode). The behavior of the electronic transfer through the molecular junction becomes more clearly visible by studying of the conductance-voltage characteristics. The numerical calculations are done based on this model to study the changes in conductance behavior through a single molecule junction in the resonant tunneling regime. According to our results, the conductance-voltage characteristics are influenced by (I) the electron-vibration interaction, (II) the molecular bridge-leads coupling strength, (III) the junction temperature, and (IV) the molecular vibrational mode energy. We conclude that the previous parameters have a significant role in determination of the electron conduction through the single-molecule junctions. Especially, the conductance is very sensitive to the molecular bridge-leads coupling strength and the junction temperature. These features provide important information about the study of the electronic transport phenomena in molecular junctions. | ||
| Keywords | ||
| Molecular junction; nonequilibrium Green function theory; electronic transport; conductance; electron; vibration coupling | ||
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