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DTSTAMP:20260411T100341
DTSTART:20180917T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/833662-molecularly-li
 nked-gold-nanoparticle-films-across-the-insulator-to-metal-transition-from
 -hopping-to-strong-electron-correlations-monique-tie-uoft
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Molecularly-linked gold nanoparticle films across the insulator-to-
 metal transition: from hopping to strong electron correlations - Monique T
 ie (UofT)
DESCRIPTION:Molecularly-linked gold nanoparticle films across the insulator
 -to-metal transition: from hopping to strong electron correlationsMonique 
 Tie (Postdoctoral researcher)Department of ChemistryUniversity of Toronto

 \n 
\nAbstract: Strong electron-electron interactions are widely believed
  to play a key role in a range of remarkable phenomena such as high Tc sup
 erconductivity among others. Strongly correlated electrons are often descr
 ibed by the Hubbard model\, which captures important gross features of pha
 se diagrams of strongly correlated materials. However\, open challenges in
 clude experimentally mapping correlated electron phenomena beyond those ca
 ptured by the Hubbard model.
\n 
\nWe use both film thickness and electro
 lyte gating to study a metal-insulator transition in a new class of strong
 ly correlated material\, namely\, nanostructured materials\, using 1\,4-bu
 tanedithiol-linked gold nanoparticle films (NPFs) as an example. On the in
 sulating side of the transition\, we observe Efros-Shklovskii variable ran
 ge hopping and a soft Coulomb gap\, evidencing the importance of Coulomb b
 arriers. On the metallic side of the transition\, we observe signatures of
  strong disorder mediated electron-electron correlations. Films near the m
 etal-insulator transition also reveal a zero-bias conductance peak\, which
  we attribute to a resonance at the Fermi level predicted by the Hubbard a
 nd Anderson impurity models when electrons delocalize and experience stron
 g Coulomb electron-electron interactions.
\n 
\nThis study shows that by 
 enabling large changes in carrier density\, electrolyte gating of gold NPF
 s is a powerful means for tuning through the Hubbard MIT in NPFs. By revea
 ling the range of behaviours that strongly correlated electrons can exhibi
 t\, this platform can guide the development of an improved understanding o
 f correlated materials.
\n 
\nBio: Postdoctoral researcher in the Dhirani
 's group.
\n 
\nCette conférence est présentée par le RQMP Versant N
 ord du Département de physique de l'Université de Montréal et de Gé
 nie physique de la Polytechnique.
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