Raman光谱揭示Sr $_2$ RuO $_4$费米液体性质的轨道二分法
Orbital dichotomy of Fermi liquid properties in Sr$_2$RuO$_4$ revealed by Raman spectroscopy
摘要：
本文报道了用偏振分辨拉曼光谱研究多带费米液体Sr \textsubscript{2} RuO \textsubscript{4}中准粒子性质的轨道依赖性。我们表明，准粒子散射率显示$ω^{2}$依赖性预期的费米液体。此外，我们观察到一个明确的偏振依赖的能量和温度依赖的准粒子散射率和质量，与$d_{xz/yz}$轨道导出的准粒子显示出更强大的费米液体性质比$d_{xy}$轨道导出的。观察到的准粒子的轨道二分法是一致的图片的Sr \textsubscript{2} RuO \textsubscript{4}作为洪德的金属。我们的研究建立了拉曼散射作为一个强有力的探针费米液体性质的相关金属。
英文摘要：
We report a polarization-resolved Raman spectroscopy study of the orbital dependence of the quasiparticles properties in the prototypical multi-band Fermi liquid Sr\textsubscript{2}RuO\textsubscript{4}. We show that the quasiparticle scattering rate displays $ω^{2}$ dependence as expected for a Fermi liquid. Besides, we observe a clear polarization-dependence in the energy and temperature dependence of the quasiparticle scattering rate and mass, with the $d_{xz/yz}$ orbital derived quasiparticles showing significantly more robust Fermi liquid properties than the $d_{xy}$ orbital derived ones. The observed orbital dichotomy of the quasiparticles is consistent with the picture of Sr\textsubscript{2}RuO\textsubscript{4} as a Hund's metal. Our study establishes Raman scattering as a powerful probe of Fermi liquid properties in correlated metals.
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