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“Better than nothing?
The Search For Quantum Interference Based Single-molecule Insulators"
Thursday, 19 Nov 2020
Video-Recording for any system with MP4-support
- Video.mp4 (ca.233 Mb)
15:15 – 16:05
While there has been significant focus on making high-conductance molecular wires,
it is equally challenging to make extremely low conductance systems.
Here we present some of our efforts to find highly insulating molecules.
We have found the first molecule with clear suppression of the single-molecule
conductance due to what is known as s-interference. The interference effects in this
system are so significant that our calculations show that the central unit is more
insulating than a vacuum gap of the same dimensions. Through an extensive
investigation of a family of molecules we show that their transport properties can
largely be understood by considering these otherwise complex molecules as
constrained linear systems. Varying the constituent atoms between carbon, silicon,
and germanium, we now know that the majority of molecules in the so-called
bicyclo[2.2.2]octane class are likely to be highly insulating. Finally, we have recently
discovered the factors that can be critical for the appearance of such a significant
Speaker today: Gemma C. Solomon
(University Copenhagen, Nano-Science Center and Department of Chemistry)
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