论文标题
手性多胎效率COSI中的集体等离子体模式
Collective plasmonic modes in the chiral multifold fermionic material CoSi
论文作者
论文摘要
拓扑半学中的等离子原料为基本物理探索以及技术应用提供了令人兴奋的机会。在这里，我们研究了示例性手性晶体COSI中的等离子，该晶体晶体COSI具有多种多重效率激发。我们表明，COSI在0.1 eV时在红外状态中占据了两个不同的等离子体模式，在长波长限制下有1.1 eV。发现0.1 eV等离子体是高度分散的，起源于与双自旋-1激发相关的标准内集体振荡，而1.1 eV等离子体无分散，涉及带间相关性。两种等离子体模式都位于颗粒连续体的外部，并具有长寿命。我们的研究表明，COSI类的材料将为探索拓扑等离子间的基本和技术方面提供有趣的材料平台。
Plasmonics in topological semimetals offers exciting opportunities for fundamental physics exploration as well as for technological applications. Here, we investigate plasmons in the exemplar chiral crystal CoSi, which hosts a variety of multifold fermionic excitations. We show that CoSi hosts two distinct plasmon modes in the infrared regime at 0.1 eV and 1.1 eV in the long-wavelength limit. The 0.1 eV plasmon is found to be highly dispersive, and originates from intraband collective oscillations associated with a double spin-1 excitation, while the 1.1 eV plasmon is dispersionless and it involves interband correlations. Both plasmon modes lie outside the particle-hole continuum and possess long lifetime. Our study indicates that the CoSi class of materials will provide an interesting materials platform for exploring fundamental and technological aspects of topological plasmonics.
