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arXiv 1504.02592cond-mat.mtrl-sciphysics.optics
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拓扑绝缘体环中的等离子体-声子相互作用

Plasmon-phonon interactions in topological insulator rings

Marta Autore, Fausto D'Apuzzo, Alessandra Di Gaspare, Valeria Giliberti, Odeta Limaj, Pascale Roy, Matthew Brahlek, Nikesh Koirala, Seongshik Oh, Francisco Javi… 展开作者

Marta Autore, Fausto D'Apuzzo, Alessandra Di Gaspare, Valeria Giliberti, Odeta Limaj, Pascale Roy, Matthew Brahlek, Nikesh Koirala, Seongshik Oh, Francisco Javier Garcìa de Abajo, Stefano Lupi

摘要:

狄拉克电子在等离子体和光子学中的巨大潜力在石墨烯中被发现后就已经很容易被认识到,随后被应用于智能光学器件。狄拉克载流子也存在于拓扑绝缘体(TI)中--在体相中具有绝缘能隙而在表面上具有本征狄拉克金属态的量子系统。在这里,我们研究的等离子体响应的环结构图案化的Bi $_2$ Se $_3$ TI膜,我们通过太赫兹(THz)光谱研究。观察到的环表现出一个键合和反键等离子体激元模式,我们调整频率,通过改变它们的直径。我们发展了一种基于未图案化薄膜的THz电导率的分析理论,该理论准确地描述了当键合等离子体激元扫过该材料所表现出的2.THz声子时实验观察到的强等离子体激元-声子杂化和Fano干涉。这为研究拓扑绝缘体中的等离子体激元及其在可调谐太赫兹器件中的应用开辟了道路。

英文摘要:

The great potential of Dirac electrons for plasmonics and photonics has been readily recognized after their discovery in graphene, followed by applications to smart optical devices. Dirac carriers are also found in topological insulators (TI) --quantum systems having an insulating gap in the bulk and intrinsic Dirac metallic states at the surface--. Here, we investigate the plasmonic response of ring structures patterned in Bi$_2$Se$_3$ TI films, which we investigate through terahertz (THz) spectroscopy. The rings are observed to exhibit a bonding and an antibonding plasmon modes, which we tune in frequency by varying their diameter. We develop an analytical theory based on the THz conductivity of unpatterned films, which accurately describes the strong plasmon-phonon hybridization and Fano interference experimentally observed as the bonding plasmon is swiped across the promineng 2\,THz phonon exhibited by this material. This work opens the road for the investigation of plasmons in topological insulators and for their application in tunable THz devices.

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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