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Sub-Atomic Channeling and Vortex Beams in SrTiO₃

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arxiv 1808.03348 v1 pith:5G27E3QW submitted 2018-08-09 cond-mat.mtrl-sci

Sub-Atomic Channeling and Vortex Beams in SrTiO₃

classification cond-mat.mtrl-sci
keywords sub-atomicbeamchannelingprobevortexbeamselectronpropagation
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Inspired by recent experimental sub-atomic measurements using analytical aberration-corrected scanning transmission electron microscopes (STEMs), we studied electron probe propagation in crystalline SrTiO$_3$ at the sub-atomic length scale. Here, we report the existence of sub-atomic channeling and the formation of a vortex beam at this scale. The results of beam propagation simulations, which are performed at various crystal temperatures and STEM probe convergence angles (10 to 50 mrad) and beam energies (80 to 300 keV), showed that reducing the ambient temperature can enhance the sub-atomic channeling and that STEM probe parameters can be used to control the vortex beams and adjust their intensity, speed, and area.

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