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

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${}_{0.955}$Co${}_{0.045}$)${}_2$As${}_2$ 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.

References in corpus (3)

• Rotational Symmetry Breaking in the Hidden-Order Phase of URu2Si2
• Effect of Co doping on the in-plane anisotropy in the optical spectrum of underdoped Ba(Fe1-xCox)2As2
• Quasi-particle evidence for the nematic state above $T_{\mathrm{c}}$ in Sr${}_x$Bi${}_2$Se${}_3$