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Thursday, October 28, 2021 at 3:15 pm

To be held over Zoom


Host: Zhi-Xun Shen


Mengkun Liu

Stony Brook University


Electronic Phenomena in Correlated Quantum Materials at the Nanoscale

I report moiré-type phase separation and current-induced metal-insulator-metal stripes in correlated transition metal oxides at the nanoscale. Mesoscopic periodic textures in La0.67Sr0.33MnO3 thin films and Ca2RuO4 single crystals were revealed by infrared nano-imaging and nano-spectroscopy measurements. Those textures have orientations tied uniquely to the crystallographic axes of the sample or miscut steps in the substrate, implying a strong coupling of the electronic transition to lattice degrees of freedom. To quantitatively resolve the phase properties, we employ model-infused machine learning to predict the optical dielectric function directly from raw imaging and spectroscopy data. Via the combination of the state-of-the-art broadband infrared light sources, improved capabilities in the scanning probe techniques, and new types of data analysis and acquisition toolboxes, we set the stage for future nanoscopic investigations of low energy electron, phonon, and spin dynamics in complex quantum material systems.