Projects per year
By recording low-noise energy-dispersive x-ray spectroscopy maps from crystalline specimens using aberration-corrected scanning transmission electron microscopy, it is possible to probe core-level electron orbitals in real space. Both the 1s and 2p orbitals of Sr and Ti atoms in SrTiO3 are probed, and their projected excitation potentials are determined. This paper also demonstrates experimental measurement of the electronic excitation impact parameter and the delocalization of an excitation due to Coulombic beam-orbital interaction.
Bibliographical noteFunding Information:
This paper was supported, in part, by the National Science Foundation (NSF) under Award No. DMR-1006706 and NSF Materials Research Science Engineering Center (MRSEC) under Awards No. DMR-0819885 and No. DMR-1420013. The STEM analysis was carried out in the Characterization Facility of the University of Minnesota, which receives partial support from the NSF through the MRSEC program. Multislice computer simulations were performed using resources provided by the Minnesota Supercomputing Institute. The authors thank Dr. E. Ebbini for many critical discussions and guidance with multidimensional deconvolution algorithms, Dr. P. Batson and P. Kumar for helpful discussions, and Dr. M. Topsakal and Dr. R. Wentzcovitch for providing density functional theory calculations that have influenced the course of the analysis. We also thank Dr. F. Bates, Dr. C. Leighton, Dr. D. Hickey, and Dr. D. Flannigan for critically reading the manuscript.
© 2016 American Physical Society.
Copyright 2019 Elsevier B.V., All rights reserved.
How much support was provided by MRSEC?
Reporting period for MRSEC
- Period 3