Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 57: Transport: Molecular Electronics I
TT 57.12: Talk
Wednesday, April 2, 2014, 12:45–13:00, HSZ 304
A Simple Graphical Model to Predict and to Control of Quantum Interference in T-shaped Molecular Junctions — •Daijiro Nozaki1, Haldun Sevincli2, Stanislav M. Avdoshenko3, Rafael Gutierrez1, and Gianaurelio Cuniberti1,4,5 — 1Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany. — 2Department of Micro- and Nanotechnology, TU Denmark, DK-2800 Kgs. Lyngby, Denmark — 3School of Materials Engineering, Purdue University, Indiana 47907, USA — 4Center for Advancing Electronics Dresden (cfAED), TU Dresden, 01062 Dresden, Germany. — 5Dresden Center for Computational Materials Science (DCCMS), TU Dresden, 01062 Dresden, Germany
Quantum interference (QI) effect in molecular devices introduces an abrupt
dip in the transmission spectra, thus it can be used to a series of
applications such as molecular switches and molecular thermoelectric
devices. For the development of the QI-based molecular devices, it is
important to give the guideline to predict and to control the shape and
positions of QI in transmission spectra. For this purpose, we present a
simple graphical approach (called as "parabolic model") to predict the
appearance, shape, and energy position of the QI in transmission spectra
for T-shaped molecular devices. We show that this "parabolic model"
enables one to visualize the relationship between key electronic
parameters and the shape of transmission functions without calculating
transmission functions.
D. Nozaki, et al., Phys. Chem. Chem. Phys. 15, 13951 (2013).