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SYUE: Symposium Ultrafast Excitation Pathways of Quantum Materials
SYUE 1: Ultrafast Excitation Pathways of Quantum Materials
SYUE 1.1: Invited Talk
Wednesday, March 29, 2023, 09:30–10:00, HSZ 01
Dynamics and control in quantum materials using multi-terahertz spectroscopy — •Richard Averitt — UC San Diego, Department of Physics
Dynamics and control of quantum materials using light has emerged as a frontier research area. There are numerous possibilities to investigate including photoinduced metastability, creating non-equilibrium states with emergent properties, driving coherent many-body dynamics, or impulsively driving an order parameter to investigate the nonlinear *optical* response which can encode properties not evident with linear optical probes. In this vein, terahertz to mid-infrared spectroscopy is a particularly useful probe of low energy electrodynamics in quantum materials in both the static and dynamic limits. I will present examples from my research group. This includes: (i) Efficient coherent magnon generation in the Mott insulator Sr2IrO4 using sub-gap circularly polarized mid-IR pulses. (ii) Gentle photoexcitation of the putative excitonic insulator Ta2NiSe5 resulting in stimulated nonlinear parametric terahertz generation that serves as a reporter of the excitonic condensate and its coupling to phonons.