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Quasi-one-dimensional metallic conduction channels in exotic ferroelectric topological defects

Authors :
Zhipeng Hou
Min Zeng
Xingsen Gao
Yadong Wang
Fei Xue
Long Qing Chen
Dongfeng Zheng
Wenda Yang
Zhen Fan
Deyang Chen
Jinwei Gao
Luyong Zhang
Jun-Ming Liu
Yang Zhang
Guo Tian
Chao Chen
Minghui Qin
Source :
Nature Communications, Vol 12, Iss 1, Pp 1-11 (2021), Nature Communications
Publication Year :
2021
Publisher :
Nature Portfolio, 2021.

Abstract

Ferroelectric topological objects (e.g. vortices, skyrmions) provide a fertile ground for exploring emerging physical properties that could potentially be utilized in future configurable nanoelectronic devices. Here, we demonstrate quasi-one-dimensional metallic high conduction channels along two types of exotic topological defects, i.e. the topological cores of (i) a quadrant vortex domain structure and (ii) a center domain (monopole-like) structure confined in high quality BiFeO3 nanoisland array, abbreviated as the vortex core and the center core. We unveil via phase-field simulations that the superfine (< 3 nm) metallic conduction channels along center cores arise from the screening charge carriers confined at the core whereas the high conductance of vortex cores results from a field-induced twisted state. These conducting channels can be repeatedly and reversibly created and deleted by manipulating the two topological states via an electric field, leading to an apparent electroresistance effect with an on/off ratio higher than 103. These results open up the possibility of utilizing these functional one-dimensional topological objects in high-density nanoelectronic devices such as ultrahigh density nonvolatile memory.<br />manuscript (21 pages, 4 figures) plus supplementary information

Details

Language :
English
ISSN :
20411723
Volume :
12
Issue :
1
Database :
OpenAIRE
Journal :
Nature Communications
Accession number :
edsair.doi.dedup.....696c7527a990c5ab37cdc162bb536d15