Imaging the potential distribution of individual charged impurities on graphene by low-energy electron holography
arXiv:1610.06420 · doi:10.1016/j.ultramic.2017.07.019
Abstract
While imaging individual atoms can routinely be achieved in high resolution transmission electron microscopy, visualizing the potential distribution of individually charged adsorbates leading to a phase shift of the probing electron wave is still a challenging task. Low-energy electrons (30 - 250 eV) are sensitive to localized potential gradients. We employed low-energy electron holography to acquire in-line holograms of individual charged impurities on free-standing graphene. By applying an iterative phase retrieval reconstruction routine we recover the potential distribution of the localized charged impurities present on free-standing graphene.
References in corpus (12)
- Detection of Individual Gas Molecules Absorbed on Graphene
- Charged Impurity Scattering in Graphene
- Intrinsic Response of Graphene Vapor Sensors
- Visualizing Individual Nitrogen Dopants in Monolayer Graphene
- Solution to the twin image problem in holography
- Practical algorithms for simulation and reconstruction of digital in-line holograms
- Transport in chemically doped graphene in the presence of adsorbed molecules
- When holography meets coherent diffraction imaging
- Ultra-Clean Freestanding Graphene by Platinum-Metal Catalysis
- Reconstruction of purely absorbing, absorbing and phase-shifting, and strong phase-shifting objects from their single-shot in-line holograms
- Direct observation of individual charges and their dynamics on graphene by low-energy electron holography
- Mapping Unoccupied Electronic States of Freestanding Graphene by Angle-Resolved Low-Energy Electron Transmission
Cited by in corpus (5)
- Direct visualization of charge transport in suspended (or free-standing) DNA strands by low-energy electron microscopy
- The role of impurities on the optical properties of rectangular graphene flakes
- Impurity-doped scalar fields in arbitrary dimensions
- Phase retrieval methods applied to coherent imaging
- How to image single isolated atoms by using coherent low-energy electrons