Autocorrected off-Axis holography of two-dimensional materials

Felix Kern, Martin Linck, Daniel Wolf, Nasim Alem, Himani Arora, Sibylle Gemming, Artur Erbe, Alex Zettl, Bernd Büchner, Axel Lubk

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The reduced dimensionality in two-dimensional materials leads to a wealth of unusual properties, which are currently explored for both fundamental and applied sciences. In order to study the crystal structure, edge states, the formation of defects and grain boundaries, or the impact of adsorbates, high-resolution microscopy techniques are indispensable. Here we report on the development of an electron holography (EH) transmission electron microscopy (TEM) technique, which facilitates high spatial resolution by an automatic correction of geometric aberrations. Distinguished features of EH beyond conventional TEM imaging are gap-free spatial information signal transfer and higher dose efficiency for certain spatial frequency bands as well as direct access to the projected electrostatic potential of the two-dimensional material. We demonstrate these features with the example of h-BN, for which we measure the electrostatic potential as a function of layer number down to the monolayer limit and obtain evidence for a systematic increase of the potential at the zig-zag edges.

Original languageEnglish (US)
Article number043360
JournalPhysical Review Research
Volume2
Issue number4
DOIs
StatePublished - Dec 11 2020

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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