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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
; Jun-Ming Liu
; | | Date: |
3 Jun 2020 | | 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. | | Source: | arXiv, 2006.2011 | | Services: | Forum | Review | PDF | Favorites | |
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