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Proceedings Paper

Ultrafast quasiparticle dynamics in correlated semimetals (Conference Presentation)
Author(s): Venkatraman Gopalan; Yakun Yuan; Peter Kissin; Danilo Puggioni; Kevin Cremin; Zhiqiang Mao; James M. Rondinelli; Richard D. Averitt; Haricharan Padmanabhan

Paper Abstract

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.

Paper Details

Date Published: 9 September 2019
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Proc. SPIE 11122, Ultrafast Nonlinear Imaging and Spectroscopy VII, 1112208 (9 September 2019);
Show Author Affiliations
Venkatraman Gopalan, The Pennsylvania State Univ. (United States)
Yakun Yuan, The Pennsylvania State Univ. (United States)
Peter Kissin, Univ. of California, San Diego (United States)
Danilo Puggioni, Northwestern Univ. (United States)
Kevin Cremin, Univ. of California, San Diego (United States)
Zhiqiang Mao, The Pennsylvania State Univ. (United States)
James M. Rondinelli, Northwestern Univ. (United States)
Richard D. Averitt, Univ. of California, San Diego (United States)
Haricharan Padmanabhan, The Pennsylvania State Univ. (United States)


Published in SPIE Proceedings Vol. 11122:
Ultrafast Nonlinear Imaging and Spectroscopy VII
Zhiwen Liu; Demetri Psaltis; Kebin Shi, Editor(s)

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