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DTSTAMP:20261028T122838Z
SUMMARY:Twisted multilayer graphene: Superperiodicity and Quasicrystals
DESCRIPTION:<p><strong>PhD:&nbsp\;Pedro Alcázar Guerrero</strong></p>\n<p>
 <strong>Directors</strong>:</p>\n<p>Directors: Dr Aron Cummings (<a href="
 /en/theoretical-and-computational-nanoscience-group">Theoretical and Compu
 tational Nanoscience</a>)\, ICREA Prof. Stephan Roche&nbsp\;(<a href="/en/
 theoretical-and-computational-nanoscience-group">Theoretical and Computati
 onal Nanoscience</a>) and ICREA Prof. Sergio O. Valenzuela&nbsp\;(<a href=
 "/en/physics-and-engineering-of-nanodevices-group">Physics and Engineering
  of Nanodevices</a>)&nbsp\;at ICN2.</p>\n<p><strong>Short Abstract:</stron
 g></p>\n<p>This thesis investigates the influence of superperiodicity\, qu
 asiperiodicity\, and disorder on electronic and spin transport in graphene
 -based systems. Large-scale atomistic real-space quantum-transport methods
  are employed to characterize the differences between periodic and quasipe
 riodic dynamics. In magic-angle twisted bilayer graphene\, moderate disord
 er is shown to induce delocalization and increase the mean free path\, a p
 henomenon connected to the quantum metric of the electronic states. Sub-ba
 llistic transport and self-similar spatial patterns are also identified in
  quasicrystalline structures\, although these features are highly sensitiv
 e to disorder and interlayer coupling.</p>\n<p>Finally\, atomic corrugatio
 ns in suspended graphene are found to generate fluctuating Rashba fields t
 hat limit spin lifetimes\, even when charge transport remains nearly balli
 stic. These findings establish a unified relationship between geometry\, s
 tructural complexity\, disorder\, and quantum transport in twisted and cor
 rugated graphene systems.</p>\n<p>REGISTER <a href="https://forms.office.c
 om/Pages/ResponsePage.aspx?id=7y7ItE2bfUi-qg79NXo6W9JurGDujWFGj3Ojq5EAxCtU
 NDNQVEhUSVA1OFNIQU1CQzhDQ0dDUEFPTi4u">HERE</a></p>
DTSTART:20260626T123000
DTEND:20260626T215959
LOCATION:ICN2 Seminar Room\, Campus UAB
CATEGORIES:ICN2 Theses Defence
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