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9 September 2019 Ultrafast quasiparticle dynamics in correlated semimetals (Conference Presentation)
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The correlated polar semimetal Ca3Ru2O7 exhibits a rich phase diagram including two magnetic transitions (TN =56 K and TC =48 K) with the appearance of an insulating-like pseudogap (at TC ). In addition, there is a crossover back to metallic behavior at T∗=30 K, the origin of which is still under debate. We utilized ultrafast optical pump optical probe spectroscopy to investigate quasi- particle dynamics as a function of temperature in this enigmatic quantum material. n conjunction with density functional theory, our experimental results synergistically reveal the origin of the T-dependent pseudogap. Further, our data and analysis indicate that the T∗ emerges as a natural consequence of T-dependent gapping out of carriers, and does not correspond to a separate electronic transition. Our results highlight the value of low fluence ultrafast optics as a sensitive probe of low energy electronic structure, thermodynamic parameters, and transport properties of Ruddlesden-Popper ruthenates.
Conference Presentation
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Venkatraman Gopalan, Yakun Yuan, Peter Kissin, Danilo Puggioni, Kevin Cremin, Zhiqiang Mao, James M. Rondinelli, Richard D. Averitt, and Haricharan Padmanabhan "Ultrafast quasiparticle dynamics in correlated semimetals (Conference Presentation)", Proc. SPIE 11122, Ultrafast Nonlinear Imaging and Spectroscopy VII, 1112208 (9 September 2019);

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