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arXiv 1107.0892cond-mat.str-elcond-mat.mtrl-sci
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电荷序对过渡金属二硫族化合物等离子体激元色散的影响

The Effect of Charge Order on the Plasmon Dispersion in Transition-Metal Dichalcogenides

Jasper van Wezel, Roman Schuster, Andreas König, Martin Knupfer, Jeroen van den Brink, Helmuth Berger, Bernd Büchner

摘要:

利用电子能量损失谱研究了过渡金属二硫族化合物2 H-TaSe_2、2 H-TaS_2和2 H-NbSe_2中载流子等离激元的色散。对于所有三种化合物的等离子体激元色散被发现是负的小动量转移。这与在简单金属以及相关系统2 H-NbS 2中观察到的一般行为相反,2 H-NbS 2不表现出电荷顺序。我们提出了一个半经典的Ginzburg-Landau模型来解释这些观测结果,并认为电荷有序态的附近因此反映在集体激发的性质中。

英文摘要:

We investigate the dispersion of the charge carrier plasmon in the three prototypical charge-density wave bearing transition-metal dichalcogenides 2H-TaSe2, 2H-TaS2 and 2H-NbSe2 employing electron energy-loss spectroscopy. For all three compounds the plasmon dispersion is found to be negative for small momentum transfers. This is in contrast to the generic behavior observed in simple metals as well as the related system 2H-NbS2, which does not exhibit charge order. We present a semiclassical Ginzburg-Landau model which accounts for these observations, and argue that the vicinity to a charge ordered state is thus reflected in the properties of the collective excitations.

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