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arXiv 1104.2707cond-mat.mes-hall
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金属栅上石墨烯中的声等离子体激元和“soundarons”

Acoustic plasmons and "soundarons" in graphene on a metal gate

A. Principi, Reza Asgari, Marco Polini

摘要:

我们证明,在金属栅极的存在下,单层石墨烯显示无隙集体(等离子体)模式,在长波长下具有线性色散。在无规相位近似下精确计算了声等离子体群速度,并对该系统的单体谱函数进行了微观计算。尽管受到金属的屏蔽,我们发现石墨烯的准粒子光谱显示出非常丰富的结构,其特征在于复合空穴-声学等离子体激元卫星带(我们简称为“soundarons”),这可以通过例如角度分辨光电子能谱来观察。

英文摘要:

We demonstrate that single-layer graphene in the presence of a metal gate displays a gapless collective (plasmon) mode that has a linear dispersion at long wavelengths. We calculate exactly the acoustic-plasmon group velocity at the level of the random phase approximation and carry out microscopic calculations of the one-body spectral function of such system. Despite screening exerted by the metal, we find that graphene's quasiparticle spectrum displays a very rich structure characterized by composite hole-acoustic plasmon satellite bands (that we term for brevity "soundarons"), which can be observed by e.g. angle-resolved photoemission spectroscopy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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