Steven Zeltmann

I am a Staff Scientist in the group of David Muller in the Applied & Engineering Physics department. My research focuses broadly on the development of novel imaging and structural analysis techniques based on four-dimensional scanning transmission electron microscopy (4D-STEM). 4D-STEM is both an experimental and a computational task, and my work has covered both aspects of the technique. I have worked variously on multiple scattering (diffraction) theory, imaging theory, high-performance computing, experimental technique development, novel data analyses, direct electron detector development, and especially ptychography. I have had a special focus on making 4D-STEM structural measurements robust to multiple scattering. Recently, I have been particularly working on developing new low-dose phase contrast imaging with 4D-STEM.

I am also currently a staff member of the Cornell Center for Materials Research, where I specialize in performing multislice electron ptychography and EELS for both academics and industrial users.

I was formerly the Staff Scientist for Electron Microscopy at PARADIM, an NSF user facility focused on the design and realization of novel interface materials. I am one of the original core developers of py4DSTEM, the premier open source toolkit for 4D-STEM analysis. Previously, I completed my doctorate at the University of California, Berkeley, under Andy Minor and in close collaboration with Colin Ophus.