TUD, chair Cuniberti "materials science and nanotechnology" - Lehrstuhl Cuniberti "Materialwissenschaft und Nanotechnik"

Tuesday, 11 December 2007
(at 14:00 in room 115, Hallwachsstr. 3)

Theoretical study of long-ranged electron transport in molecular junctions including dephasing effects based on the D'Amato Pastawski model

Daijiro Nozaki

Kyushu University
Japan

A theoretical study of the conductance in a nano-scaled one-dimensional molecular device is presented. The incoherent transporting processes are included by using uniformly attaching fictitious probes (Büttiker probes) along the system. Using the D'Amato Pastawski model, we estimate the conductance of a series of one-dimensional molecular systems and analyze the dependence of the lentgh of the system on the conductance. The results are compared with those obtained with the Landauer model. We conclude that the incoherent scattering processes become dominant in long ranged electron transport.

Caption. Left panel: Illustration of molecular junction consisting of a Tour-wire dithiole (oligo(1,4-phenylene ethynylene)dithiole) between two electrodes. Right panel: Total conductance of the molecular junctions as a function of molecular length with (shown in dashed lines and red arrow) and without (shown in blue arrow) Büttiker probes.
The coherent conductance without Büttiker probes decreases exponentially with the increment of bridging units as shown in blue arrow, while total conductance including incoherent transport considered by uniformly attached Büttiker probes deviates from the coherent decay. The incoherent scattering becomes dominant mechanism in long-ranged transport as shown in red arrow.

Brief Bio:

Daijiro Nozaki graduated in Faculty of Science in Kyushu University in Japan. After taking B.A., he received master's degree at Department of Chemistry and Physics of Condensed Matter in Kyushu University. Currently He is PhD student in Advanced Materials Chemistry of Applied Chemistry course in Faculty of Engineering at Kyushu University and working on the theoretical research of quantum transport through nanostructures at Institute for Materials Chemistry and Engineering (IMCE) with Japan Society for the Promotion of Science (JSPS) scholarship. His research interests mainly focus on the electron transport and simulations in nanoscaled materials or devices. He is also interested in the making of visualization tools and utilities for the atomistic modeling of molecular devices.

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Invited by G. Cuniberti (nanoSeminar)

last modified: 2019.10.11 Fr

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