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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology



Wednesday, 13 December 2017
(at 9:30 in room 115, Hallwachsstr. 3)
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Super tunneling

Prof. Christian Joachim


GNS-CEMES-CNRS, 29 rue J. Marvig, 31055 Toulouse Cedex, France; MANA, National Institute for Material Sciences, 1-1 Namiki, Ibaraki, Japan; CFAED TU DRESDEN Grand Professor
   






At low bias voltage and in its HOMO-LUMO energy gap interval, the conductance of a molecular wire decays exponentially while increasing its length. The same phenomenon occurs with a surface dangling bond atomic wire. The corresponding inverse decay length beta of this through bond tunneling phenomenon ranges for example from beta = 1.2 A^-1 for an alkane molecular wire to about beta = 0.2 A^-1 for a medium large HOMO-LUMO gap kappa conjugated molecular wire. As a function of kappa and of the effective mass m* of the tunneling electrons, beta varies following a universal monotonic decay law. For a given kappa we will discuss (1) what prevents beta to be exactly zero that is reaching what can be named a super tunneling transport regime, (2) how to approach a minimum beta value by a good choice of the chemical composition of the molecular wire.

Announcement (pdf)


Invited by G. Cuniberti

Within the nanoSeminar

last modified: 2018.05.17 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