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arXiv 1010.4871cond-mat.mes-hall
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石墨烯中的非常规等离子体-声子耦合

Unconventional plasmon-phonon coupling in graphene

M. Jablan, M. Soljačić, H. Buljan

摘要:

利用自洽线性响应理论计算了石墨烯中等离子体激元和内禀光学声子的杂化。我们发现,纵向等离子体激元(横向磁模式)只耦合到横向光学声子,而石墨烯的横向等离子体激元(横向电模式)只耦合到纵向光学声子。这种偏振的混合与其他系统中通常的等离子体-声子耦合相反。通过增加载流子的浓度,对于横向(纵向)声子,声子频率的所得变化增加(减小)。

英文摘要:

We calculate hybridization of plasmons and intrinsic optical phonons in graphene by using the self-consistent linear response formalism. We find that longitudinal plasmons (transverse magnetic modes) couple exclusively to transverse optical phonons, whereas graphene's transverse plasmons (transverse electric modes) couple only to longitudinal optical phonons. This mixing of polarizations is in contrast to the usual plasmon-phonon coupling in other systems. The resulting change in phonon frequencies increases (decreases) for transverse (longitudinal) phonons by increasing the concentration of charge carriers.

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