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Dr. Xiao-Xiao ZhangUniversity of FloridaHeld via Zoom: https://uwmadison.zoom.us/j/98432497808Host: Dr. Dan Rhodes (MS&E)
Two-dimensional spin bistable molecules
AbstractThe successful isolation of two-dimensional (2D) crystals through mechanical exfoliation has led to numerous scientific breakthroughs and paved avenues for next-generation nanoscale devices, with the majority of these studies focused on inorganic van der Waals crystals. In this talk, I will present characterization of the mechanically exfoliated Fe-based magnetic molecules down to the monolayer thickness. These molecular are bound by anisotropic van der Waals interactions into 2D assemblies, and can be exfoliated into single-crystalline flakes similar to inorganic atomic crystals. With reducing thickness, we observe a substantial increase in the spin-state transition thermal hysteresis, which suggests the important roles of substrate and interlayer coupling in molecular systems. We further demonstrate the capability of fabricating organic-inorganic heterostructures with a monolayer MoS2, which exhibits an efficient interface coupling. Our results establish molecular solids with strong anisotropy of intermolecular interactions as precursors to a novel class of 2D materials, affording new possibilities for designing hybrid organic-inorganic heterostructures and devices.
Biography Xiao-Xiao Zhang is an Assistant Professor in the Department of Physics at the University of Florida. She obtained her BS from Tsinghua University (2012), Beijing, China, and a physics Ph.D. from Columbia University (2016). She did her postdoc at Stanford University and then became a Kavli postdoc fellow at Cornell University (2018-2020). Her research focuses on optical, optoelectronic and ultrafast optical characterization of novel 2D materials. Zhang is the recipient of the NSF CAREER Award and DOE Career Award.