MSE Special Speaker: Dr. Sandhya Susarla, Lawrence Berkeley National Laboratory

All dates for this event occur in the past.

2040 Fontana Labs
140 W. 19th Ave.
Columbus, OH 43210
United States

Understanding electronic correlations in quantum materials

 

Dr. Sandhya Susarla

Postdoctoral Scholar
National Center for Electron Microscopy
Molecular Foundry
Lawrence Berkeley National Laboratory
Berkeley, California

 

Abstract

photo of Sandhya Susarla's materials science and engineering research
source: Sandhya Susarla

The correlations between four fundamental degrees of freedom, lattice, spin, charge and orbital control the emergent properties in quantum materials such as spin-orbit coupling, Jahn Teller effect etc. Atomic scale analytical microscopy techniques like four-dimensional scanning transmission electron microscopy (4D-STEM), Electron energy loss spectroscopy (EELS) fit in a unique space in the suite of materials characterization to understand this co-relation between the fundamental degrees of freedom. In this talk, I’ll use oxide perovskites and two-dimensional (2D) materials as model systems to highlight three examples where (cryo) analytical electron microscopy tools would be useful. In the first part I’ll enlighten how we can use 4D-STEM, near-edge EELS and multiplet EELS calculations to decipher different types of chiral boundaries and orbital hybridization in unique topological textures in oxide perovskites. In the second part I’ll explain how we can use atomic resolution HAADF-STEM-EELS mapping to unravel local structure and chemistry in magnetic 2D materials ; a critical factor for the change in magnetic transitions. In the third part, I’ll talk about probing the nano-scale excitonic states in moiré 2D transition metal dichalcogenides heterostructures using cryo-low-loss EELS and HAADF-STEM imaging.

Bio
 

photo of Sandhya Susarla

Dr. Sandhya Susarla is a postdoctoral researcher working at National Center for Electron Microscopy (NCEM) at Lawrence Berkeley National Laboratory (LBNL) working with Dr. Peter Ercius and Prof. Ramamoorthy Ramesh. She obtained her PhD in 2019 from Materials Science and Nanoengineering department in Rice University working with Prof. Pulickel M. Ajayan. She also worked briefly in Orsay STEM group as a Chateaubriand Fellow. Her primary research interests lie in using analytical electron microscopy and spectroscopy tools to understand electronic co-relations in quantum materials. She has hands-on experience working on NION and FEI microscopes and side entry stage cryo-holders during PhD, internship and postdoc. In addition to electron microscopy, she also has extensive experience in growth of 2D materials. Apart from her own research, Sandhya also likes to mentor graduate and undergraduate students in her postdoctoral lab. She believes in equal opportunities and non-discrimination against one’s gender, race, religion , sex and country of origin.
 

Zoom option:

https://osu.zoom.us/j/91540876010?pwd=Z2RRa2FHUWdYdkphUGhDcjlUVzdPdz09

Meeting ID: 915 4087 6010

Password: 879628