在Sr2RuO4中激发载流子等离子体激元
Propagating charge carrier plasmon in Sr2RuO4
摘要：
本文报道了用透射电子能量损失谱研究Sr_2RuO_4中载流子等离子体激元激发的结果。特别是，我们目前的等离子体激元色散和它的宽度作为动量传递的函数的结果。色散可以定性地解释的RPA计算的框架中，使用非重整化紧束缚能带结构。等离子体激元的恒定长波长宽度表明，它是由衰减到带间跃迁而不是由量子临界波动引起的。对一个典型的坏金属系统的研究结果表明，1 eV附近的长波长等离子体激元激发是由弹性准粒子引起的，不受相关效应的影响。
英文摘要：
We report on studies of charge carrier plasmon excitations in Sr2RuO4 by transmission Electron Energy-Loss Spectroscopy. In particular, we present results on the plasmon dispersion and its width as a function of momentum transfer. The dispersion can be qualitatively explained in the framework of RPA calculations, using an unrenormalized tight-binding band structure. The constant long-wavelength width of the plasmon indicates, that it is caused by a decay into inter-band transition and not by quantum critical fluctuations. The results from these studies on a prototypical bad metal system show that the long-wavelength plasmon excitations near 1 eV are caused by resilient quasiparticles and are not influenced by correlation effects.
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