Skip to content.

TUD

search  |  internal  |  deutsch
Personal tools
TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

» presentations   » 2006.03.27-31




STM spectroscopy and STM imaging of linear molecules (TT 26.40 Wed 14:30 P1)

D. A. Ryndyk and G. Cuniberti

Deutsche Physikalische Gesellschaft, AKF Frühjahrstagung 2006
German Physical Society, Spring Meeting 2006


2006.03.27-31; Dresden, Germany

Inelastic tunneling spectroscopy (IETS) in combination with scanning tunneling microscopy (STM) is a powerful method to investigate electronic spectrum and transport properties of large molecules. We consider theoretically nonequilibrium electronic transport through a single molecule placed between a conducting substrate and an STM tip at finite voltages. A semi-empirical tight-binding model is used to describe linear molecules (as DNA). The STM based molecular junction is considered as a strongly asymmetric double tunnel junction. The molecule is weakly coupled to the substrate and to the STM tip. The coupling of the different parts of the molecule to the STM tip is a function of the distance, which results in a tunneling current dependence on the position of the STM tip (STM image of the molecule). In the limit of small voltages the conductance of nonmetallic molecules is very small and determined by environ-mentally induced states. At finite voltages resonant transport through molecular orbitals gives peaks in the differential conductance as a function of the voltage. The nonequilibrium Green function method is applied to calculate the contribution of different molecular orbitals at finite voltages. It is shown that molecular spectra are modified by charging and vibrational effects.



abstract (pdf)

slides (pdf)

conference announcement (html)



people| research | teaching | links | internal | home

last modified: 2017.03.30 Do
author: webadmin

contact
Prof. Dr. Gianaurelio Cuniberti
secretariat:
Ms Sylvi Katzarow
phone: +49 (0)351 463-31420
fax: +49 (0)351 463-31422
office@nano.tu-dresden.de
postal address:
Institute for Materials Science
TU Dresden
01062 Dresden, Germany
visitors and courier address:
HAL building
TU Dresden
Hallwachsstr. 3
01069 Dresden, Germany
Max Bergmann Center
TU Dresden
Budapester Str. 27
01069 Dresden, Germany