Mesoscale Confinement Effects and Emergent Quantum Interference in Titania Antidot Thin Films

Frank Barrows, Hanu Arava, Chun Zhou, Paul Nealey, Tamar Segal-Peretz, Yuzi Liu, Saidur Bakaul, Charudatta Phatak*, Amanda Petford-Long

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The effect of confinement on electron and ion transport in oxide films is of interest both fundamentally and technologically for the design of next-generation electronic devices. In metal oxides with mobile ions and vacancies, it is the interplay of the different modes of charge transport and the corresponding current-voltage signatures that is of interest. We developed a patterned structure in titania films, with feature sizes of 11-20 nm, that allow us to explore confined transport. We describe how confinement changes the competing charge transport mechanisms, the patterned antidot array leads to displacement fields and confines the charge density that results in modified and emergent electron transport with an increase in conductivity. This emergent behavior can be described by considering electron interference effects. Characterization of the charge transport with electron holography and impedance spectroscopy, and through comparison with modeling, show that nanoscale confinement is a way to control quantum interference.

Original languageEnglish (US)
Pages (from-to)12935-12944
Number of pages10
JournalACS nano
Volume15
Issue number8
DOIs
StatePublished - Aug 24 2021

Keywords

  • electron microscopy
  • electron transport
  • emergent properties
  • nanostructures
  • quantum con_nement
  • titania

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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