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SUMMARY:How Low Can We Go? The Search For Quantum Interference Based Singl
 e-molecule Insulators.
DTSTART:20200924T171500
DTEND:20200924T190000
DTSTAMP:20260510T185743Z
UID:770e9faab57d80b32fa1ec2bfe577c58b853e1b5e15cb3ab58358f0c
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Dr. Gemma C. Solomon University of Copenhagen\, DENMARK\
 nZoom 980 5758 2302 (link)\nProf. Dr. Gemma C. Solomon\nNano-Science Cente
 r and Department of Chemistry\, University of Copenhagen\,\nUniversitetspa
 rken 5\, 2100 Copenhagen Ø\, Denmark\n\nWhile there has been significant 
 focus on making high-conductance molecular wires\, it is equally challeng
 ing to make extremely low conductance systems. Here we present some of ou
 r efforts to find highly insulating molecules. We have found the first mo
 lecule with clear suppression of the single-molecule conductance due to 
 σ-interference in the form of a functionalized bicyclo[2.2.2]octasilane1
 . The interference effects in this system are so significant that our\nca
 lculations show the central unit is more insulating than a vacuum gap of 
 the same dimensions. Through an extensive investigation of a family of cy
 clic and bicyclic silanes2 we show that their transport properties can la
 rgely be understood by considering these otherwise complex molecules as 
 constrained linear systems. From a highthroughput screening study3 varyin
 g the constituent atoms between carbon\, silicon\, and germanium\, we kno
 w that majority of the molecules in the bicyclo[2.2.2]octane class are l
 ikely highly insulating. Finally\, we have recently discovered that subst
 ituents play a major role in controlling\ninterference and side-groups pre
 viously thought to be unimportant can be critical for the appearance of s
 ignificant destructive interference4.
LOCATION:Zoom
STATUS:CONFIRMED
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