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arXiv 2012.03875cond-mat.mes-hall
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石墨烯等离子体-声子耦合模式在例外点

Graphene plasmon-phonon coupled modes at the exceptional point

University of Minnesota(明尼苏达大学);Hunan University(湖南大学);IBM Thomas J. Watson Research Center(IBM托马斯·J·沃森研究中心)

Sang Hyun Park, Shengxuan Xia, Sang-Hyun Oh, Phaedon Avouris, Tony Low

AI总结:

研究石墨烯等离子体与声子耦合在例外点的特性,通过非厄米特框架确定强弱耦合转变点,展示扰动敏感性和通过调节入射角观测耦合转变。

摘要:

石墨烯等离子体的性质受到其与声子耦合的显著影响。尽管这种耦合在近场和远场光谱学中已被常规观测,但耦合强度与模式损耗之间的相互作用以及其例外点物理尚未被讨论。通过应用非厄米特框架,我们确定强耦合与弱耦合之间的转变点为例外点。通过调节耦合强度和通过栅极调制石墨烯费米能级,观察到例外点附近对扰动的增强灵敏度。最后,我们还展示通过改变辐射的入射角可以观测强到弱耦合的转变。

英文摘要:

Properties of graphene plasmons are greatly affected by their coupling to phonons. While such coupling has been routinely observed in both near-field and far-field graphene spectroscopy, the interplay between coupling strength and mode losses, and its exceptional point physics has not been discussed. By applying a non-Hermitian framework, we identify the transition point between strong and weak coupling as the exceptional point. Enhanced sensitivity to perturbations near the exceptional point is observed by varying the coupling strength and through gate modulation of the graphene Fermi level. Finally, we also show that the transition from strong to weak coupling is observable by changing the incident angle of radiation.

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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