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Title: Atomistic Defect Makes a Phase Plate for the Generation and High-Angular Splitting of Electron Vortex Beams

Abstract

Topological defects in solid-state materials by breaking the translational symmetry offer emerging properties that are not present in their parental phases. For example, edge dislocations—the 2π phase-winding topological defects—in antiferromagnetic NiO crystals can exhibit ferromagnetic behaviors. We study how these defects could give rise to topological orders when they interact with a high-energy electron beam. To probe this interaction, we formed a coherent electron nanobeam in a scanning transmission electron microscope and recorded the far-field transmitted patterns as the beam steps through the edge dislocation core in [001] NiO. Surprisingly, we found the amplitude patterns of the <020> Bragg disks evolve in a similar manner to the evolution of an annular solar eclipse. Using the ptychographic technique, we recovered the missing phase information in the diffraction plane and revealed the topological phase vortices in the diffracted beams. Through atomic topological defects, the wave function of electrons can be converted from plane wave to electron vortex. Technologically, this approach provides a feasible route for the fabrication of phase plates that can generate electron vortex beams with an angular separation that is three orders of magnitude larger than what traditional nanofabrication technology can offer. This advance will enable the collection of magneticmore » circular dichroism spectra with high spatial resolution and high efficiency, boosting the understanding of the relationship between symmetry breaking and magnetic property of individual topological defect at the atomic scale.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4]
  1. Tsinghua Univ., Beijing (China). National Center for Electron Microscopy in Beijing. Key Lab. of Advanced Materials. State Key Lab. of New Ceramics and Fine Processing. School of Materials Science and Engineering
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II
  3. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
  4. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy; Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of California, Irvine, CA (United States); Tsinghua Univ., Beijing (China)
Sponsoring Org.:
USDOE Office of Science (SC); National Natural Science Foundation of China (NNSFC); National Key Research and Development Program (China); National 973 Project of China; Fund of Key Lab. of Advanced Materials of Ministry of Education (China)
OSTI Identifier:
1498859
Report Number(s):
BNL-211346-2019-JAAM
Journal ID: ISSN 1936-0851
Grant/Contract Number:  
SC0012704; 51788104; 11834009; 51761135131; 51822105; 51671112; 51527803; 2016YFB0700402; 2015CB921700; 2015CB654902; 2018AML12
Resource Type:
Accepted Manuscript
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 13; Journal Issue: 4; Journal ID: ISSN 1936-0851
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; fabrication of phase place; atomistic topological defects; electron vortex beam; coherent diffraction imaging; electron ptychography; wave-front engineering

Citation Formats

Zhong, Xiaoyan, Lin, Jie, Kao, ShowShiuan, Liao, Zhenyu, Zhu, Jing, Huang, Xiaojing, Zhang, Rui, and Xin, Huolin L. Atomistic Defect Makes a Phase Plate for the Generation and High-Angular Splitting of Electron Vortex Beams. United States: N. p., 2019. Web. doi:10.1021/acsnano.8b07437.
Zhong, Xiaoyan, Lin, Jie, Kao, ShowShiuan, Liao, Zhenyu, Zhu, Jing, Huang, Xiaojing, Zhang, Rui, & Xin, Huolin L. Atomistic Defect Makes a Phase Plate for the Generation and High-Angular Splitting of Electron Vortex Beams. United States. doi:10.1021/acsnano.8b07437.
Zhong, Xiaoyan, Lin, Jie, Kao, ShowShiuan, Liao, Zhenyu, Zhu, Jing, Huang, Xiaojing, Zhang, Rui, and Xin, Huolin L. Fri . "Atomistic Defect Makes a Phase Plate for the Generation and High-Angular Splitting of Electron Vortex Beams". United States. doi:10.1021/acsnano.8b07437.
@article{osti_1498859,
title = {Atomistic Defect Makes a Phase Plate for the Generation and High-Angular Splitting of Electron Vortex Beams},
author = {Zhong, Xiaoyan and Lin, Jie and Kao, ShowShiuan and Liao, Zhenyu and Zhu, Jing and Huang, Xiaojing and Zhang, Rui and Xin, Huolin L.},
abstractNote = {Topological defects in solid-state materials by breaking the translational symmetry offer emerging properties that are not present in their parental phases. For example, edge dislocations—the 2π phase-winding topological defects—in antiferromagnetic NiO crystals can exhibit ferromagnetic behaviors. We study how these defects could give rise to topological orders when they interact with a high-energy electron beam. To probe this interaction, we formed a coherent electron nanobeam in a scanning transmission electron microscope and recorded the far-field transmitted patterns as the beam steps through the edge dislocation core in [001] NiO. Surprisingly, we found the amplitude patterns of the <020> Bragg disks evolve in a similar manner to the evolution of an annular solar eclipse. Using the ptychographic technique, we recovered the missing phase information in the diffraction plane and revealed the topological phase vortices in the diffracted beams. Through atomic topological defects, the wave function of electrons can be converted from plane wave to electron vortex. Technologically, this approach provides a feasible route for the fabrication of phase plates that can generate electron vortex beams with an angular separation that is three orders of magnitude larger than what traditional nanofabrication technology can offer. This advance will enable the collection of magnetic circular dichroism spectra with high spatial resolution and high efficiency, boosting the understanding of the relationship between symmetry breaking and magnetic property of individual topological defect at the atomic scale.},
doi = {10.1021/acsnano.8b07437},
journal = {ACS Nano},
number = 4,
volume = 13,
place = {United States},
year = {2019},
month = {2}
}

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