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arXiv 1303.2089cond-mat.mes-hall
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石墨烯二聚体中的量子结等离子体激元

Quantum Junction Plasmons in Graphene Dimers

Sukosin Thongrattanasiri, Alejandro Manjavacas, Peter Nordlander, F. Javier Garcia de Abajo

摘要:

通过窄结连接的掺杂石墨烯纳米岛之间的相互作用构成了探测等离子体系统中的量子效应的理想测试平台。在这里,预测相邻纳米岛中的石墨烯等离子体激元之间的相互作用对结的大小和形状极其敏感。本文报道的{\it ab initio}计算揭示了三种不同的相互作用机制:(1)对于窄桥($<4$碳原子行),结的电导太低而不允许电子输运,并且光学响应由也出现在经典描述中的特征键合偶极二聚体模式支配;(2)较宽的路口(4 - 8个碳排),在结上诱导强电荷极化,这产生了在经典描述中没有对应物的新的{\it结等离子体激元};(3)对于甚至更宽的结($\ge8$行),它们的电导足够大以允许两个石墨烯岛之间的电荷传输,导致显著的电荷转移等离子体,这也可以经典地描述。这为研究内禀等离子体量子效应开辟了一条新的途径。

英文摘要:

The interaction between doped graphene nanoislands connected by narrow junctions constitutes an ideal testbed to probe quantum effects in plasmonic systems. Here, the interaction between graphene plasmons in neighboring nanoislands is predicted to be extremely sensitive to the size and shape of the junctions. The reported {\it ab initio} calculations reveal three different regimes of interaction: (1) for narrow bridges ($<4$ carbon-atom rows), the conductance of the junction is too low to allow electron transport and the optical response is dominated by a characteristic bonding dipolar dimer mode that also appears in a classical description; (2) for wider junctions (4-8 carbon rows), a strong charge polarization is induced across the junction, which gives rise to a novel {\it junction plasmon} that has no counterpart in a classical description; (3) for even wider junctions ($\ge8$ rows), their conductance is sufficiently large to allow charge transport between the two graphene islands, resulting in a pronounced charge-transfer plasmon, which can also be described classically. This work opens a new path for the investigation of intrinsic plasmon quantum effects.

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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