Nanometer-scale tomographic reconstruction of three-dimensional electrostatic potentials in GaAs/AlGaAs core-shell nanowires

We report on the development of electron holographic tomography towards a versatile potential measurement technique, overcoming several limitations, such as a limited tilt range, previously hampering a reproducible and accurate electrostatic potential reconstruction in three dimensions. Most notably...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-09, Vol.90 (12), Article 125404
Main Authors: Lubk, A., Wolf, D., Prete, P., Lovergine, N., Niermann, T., Sturm, S., Lichte, H.
Format: Article
Language:English
Subjects:
Aluminum gallium arsenides
Electrostatics
Gallium arsenide
Gallium arsenides
Nanostructure
Nanowires
Reconstruction
Three dimensional
Tomography
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Summary:We report on the development of electron holographic tomography towards a versatile potential measurement technique, overcoming several limitations, such as a limited tilt range, previously hampering a reproducible and accurate electrostatic potential reconstruction in three dimensions. Most notably, tomographic reconstruction is performed on optimally sampled polar grids taking into account symmetry and other spatial constraints of the nanostructure. Furthermore, holographic tilt series acquisition and alignment have been automated and adapted to three dimensions. We demonstrate 6 nm spatial and 0.2 V signal resolution by reconstructing various, previously hidden, potential details of a GaAs/AlGaAs coreshell nanowire. The improved tomographic reconstruction opens pathways towards the detection of minute potentials in nanostructures and an increase in speed and accuracy in related techniques such as x-ray tomography.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.90.125404