arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1702.00302physics.opticscond-mat.mes-hallcond-mat.mtrl-sci
收藏

光学频率下拓扑绝缘体的等离子体激元

Plasmonics of Topological Insulators at Optical Frequencies

Jun Yin, Harish N. S. Krishnamoorthy, Giorgio Adamo, Alexander M. Dubrovkin, Yidong D. Chong, Nikolay I. Zheludev, Cesare Soci

摘要:

纳米等离子体器件的发展,如等离子体电路和超材料超透镜在可见光到紫外线频率范围内,受到缺乏低损耗等离子体介质的阻碍。最近,在一类拓扑绝缘体中发现了强等离子体激元响应。本文采用第一性原理密度泛函理论研究了拓扑绝缘四元(Bi,Sb)2(Te,Se)3三硫族化合物的介电函数.体等离子体性质,占主导地位的带间跃迁,观察到从2-3 eV,并延伸到更高的频率。此外,在蓝色和UV波长下,三硫属化合物是比金和银更好的等离子体介质。通过分析薄板,我们还表明,这些材料表现出拓扑保护的表面状态,这是能够支持传播等离子体极化激元模式在一个非常宽的光谱范围内,从可见光到中红外线及以上,由于组合的表面间和内带跃迁。

英文摘要:

The development of nanoplasmonic devices, such as plasmonic circuits and metamaterial superlenses in the visible to ultraviolet frequency range, is hampered by the lack of low-loss plasmonic media. Recently, strong plasmonic response was reported in a certain class of topological insulators. Here, we present a first-principles density functional theory analysis of the dielectric functions of topologically insulating quaternary (Bi,Sb)2(Te,Se)3 trichalcogenide compounds. Bulk plasmonic properties, dominated by interband transitions, are observed from 2-3 eV and extend to higher frequencies. Moreover, trichalcogenide compounds are better plasmonic media than gold and silver at blue and UV wavelengths. By analysing thin slabs, we also show that these materials exhibit topologically protected surface states, which are capable of supporting propagating plasmon polariton modes over an extremely broad spectral range, from the visible to the mid-infrared and beyond, owing to a combination of inter- and intra-surface band transitions.

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。

↑