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Weiwei Xie

Exploring Novel Quantum Materials under High Pressure and High Temperature 

Wed, Oct. 25, 2023, 4:30pm
Taylor Auditorium, Frick Chemistry Lab B02
Host: SILS

Pressure, an intensive variable, is a virtually unexplored pathway to new quantum materials. The application of high pressure can yield dramatic new examples of quantum materials. In this presentation, I will discuss how high pressure can be used to tune unexpected physical properties in magnetic topological materials and low dimensional materials. The use of high pressure and high temperature synthesis can stabilize the exotic quantum phenomena detected by high pressure X-ray and neutron scattering. I will also introduce our new lab-based in-situ high pressure and high temperature single crystal X-ray diffraction technique, which can guide us to synthesize materials rationally under high pressure and high temperature. High pressure synthesis techniques will be the focus of the discussion, novel iridates (Sr2IrO4, SrIrO3), tetragonal BaCoO3, and La3Ni2O7. Furthermore, we are utilizing artificial intelligence (AI) to search for the metastable phase under high pressure, which enables us to explore a much larger phase space and discover new quantum materials. These advancements in high pressure techniques and the integration of AI have opened new avenues for discovering and understanding quantum materials.

I will also talk a little about our close collaboration as a solid-state chemist with other molecular chemists to understand various chemistry systems, for example, detecting the excited magneton of metal ions in molecules under high pressure; measuring quantum spin and phonon coherence in molecules; high-throughput screening phonon interaction data from machine learning from IR-Raman 2D images; crystalline mechanism study of ionic liquids under high pressure; building up in-situ study of fungi cell wall and related drug discovery, and so on.