Quantum-size effects in hafnium-oxide resistive switching

Shibing Long, Xiaojuan Lian, Carlo Cagli, Xavier Cartoixà, Riccardo Rurali, Enrique Miranda, David Jiménez, Luca Perniola, Ming Liu, Jordi Suñé

Research output: Contribution to journalArticleResearchpeer-review

130 Citations (Scopus)

Abstract

Discrete changes of conductance of the order of G0 2e 2/h reported during the unipolar reset transitions of Pt/HfO 2/Pt structures are interpreted as the signature of atomic-size variations of the conducting filament (CF) nanostructure. Our results suggest that the reset occurs in two phases: a progressive narrowing of the CF to the limit of a quantum wire (QW) followed by the opening of a spatial gap that exponentially reduces the CF transmission. First principles calculations show that oxygen vacancy paths in HfO2 with single- to few-atom diameters behave as QWs and are capable of carrying current with G0 conductance. © 2013 AIP Publishing LLC.
Original languageEnglish
Article number183505
JournalApplied Physics Letters
Volume102
DOIs
Publication statusPublished - 6 May 2013

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