Reflection anisotropy experiments to study non-equilibrium dynamics of electronic nematicity

2019/11/29 by Inho Kwak, Jaeseok Son, Kwak, Inho +11
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Optics (physics.optics) #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con)

paper · pdf · doi:10.48550/arxiv.1911.12920

openalex publication_date 2019/11/29 · openalex created_date 2019/12/05 · openalex updated_date 2026/07/28

Abstract

Electronic nematicity have attracted a great deal of interest in the unconventional superconductivity research. We present an experimental method to investigate reflectivity anisotropy by the electronic nematicity and its non-equilibrium dynamics. Our experimental results on Ba(Fe_0.955Co_0.045)₂As₂ single crystal clearly feature the broken four-fold symmetry along directions parallel to Fe-Fe bonding. Numerical simulations using WVASE from Woollam Co. demonstrate that our method is highly reliable under various experimental conditions. Finally, we perform time-resolved reflectivity anisotropy measurement confirming that photo-excitation by 1.55 eV photons suppresses the reflectivity anisotropy due to nematic order.

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