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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

3 Scopus Citations
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Author(s)

  • Jie Lin
  • Showshiuan Kao
  • Zhenyu Liao
  • Jing Zhu
  • Xiaojing Huang
  • Rui Zhang
  • Huolin L. Xin

Detail(s)

Original languageEnglish
Pages (from-to)3964-3970
Journal / PublicationACS Nano
Volume13
Issue number4
Online published22 Feb 2019
Publication statusPublished - 23 Apr 2019
Externally publishedYes

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. Herein, 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 3 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.

Research Area(s)

  • atomistic topological defects, coherent diffraction imaging, electron ptychography, electron vortex beam, fabrication of phase place, wavefront engineering

Citation Format(s)

Atomistic Defect Makes a Phase Plate for the Generation and High-Angular Splitting of Electron Vortex Beams. / Zhong, Xiaoyan; Lin, Jie; Kao, Showshiuan; Liao, Zhenyu; Zhu, Jing; Huang, Xiaojing; Zhang, Rui; Xin, Huolin L.

In: ACS Nano, Vol. 13, No. 4, 23.04.2019, p. 3964-3970.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review