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

Wenda Yang, Guo Tian, Yang Zhang, Fei Xue, Dongfeng Zheng, Luyong Zhang, Yadong Wang, Chao Chen, Zhen Fan, Zhipeng Hou, Deyang Chen, Jinwei Gao, Min Zeng, Minghui Qin, Long-Qing Chen, Xingsen Gao () and Jun-Ming Liu
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Wenda Yang: Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University
Guo Tian: Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University
Yang Zhang: The Pennsylvania State University
Fei Xue: The Pennsylvania State University
Dongfeng Zheng: Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University
Luyong Zhang: Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University
Yadong Wang: Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University
Chao Chen: Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University
Zhen Fan: Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University
Zhipeng Hou: Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University
Deyang Chen: Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University
Jinwei Gao: Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University
Min Zeng: Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University
Minghui Qin: Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University
Long-Qing Chen: The Pennsylvania State University
Xingsen Gao: Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University
Jun-Ming Liu: Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract Ferroelectric topological objects provide a fertile ground for exploring emerging physical properties that could potentially be utilized in future nanoelectronic devices. Here, we demonstrate quasi-one-dimensional metallic high conduction channels associated with the topological cores of quadrant vortex domain and center domain (monopole-like) states confined in high quality BiFeO3 nanoislands, abbreviated as the vortex core and the center core. We unveil via the phase-field simulation that the superfine metallic conduction channels along the center cores arise from the screening charge carriers confined at the core region, whereas the high conductance of vortex cores results from a field-induced twisted state. These conducting channels can be reversibly created and deleted by manipulating the two topological states via 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, e.g. nonvolatile memory.

Date: 2021
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DOI: 10.1038/s41467-021-21521-9

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