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Phase offset method of ptychographic contrast reversal correction
Christoph Hofer, Chuang Gao, Tamazouzt Chennit +2
The contrast transfer function of direct ptychography methods such as the single side band (SSB) method are single signed, yet these methods still sometimes exhibit contrast revers…
Reliable phase quantification in focused probe electron ptychography of thin materials
Christoph Hofer, Timothy J. Pennycook
Electron ptychography provides highly sensitive, dose efficient phase images which can be corrected for aberrations after the data has been acquired. This is crucial when very prec…
On central focusing for contrast optimization in direct electron ptychography of thick samples
C. Gao, C. Hofer, T. J. Pennycook
Ptychography provides high dose efficiency images that can reveal light elements next to heavy atoms. However, despite ptychography having an otherwise single signed contrast trans…
Detecting charge transfer at defects in 2D materials with electron ptychography
Christoph Hofer, Jacob Madsen, Toma Susi +1
Electronic charge transfer at the atomic scale can reveal fundamental information about chemical bonding, but is far more challenging to directly image than the atomic structure. T…