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arXiv 2310.09481cond-mat.mes-hallphysics.optics
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拓扑绝缘体中耦合超材料-声子的太赫兹频段极化激元

Coupled metamaterial-phonon terahertz range polaritons in a topological insulator

Sirak M. Mekonen, Deepti Jain, Seongshik Oh, N. P. Armitage

AI总结:

本文通过TDTS实验展示BST拓扑绝缘体声子与LC超材料光子模式的强耦合,观测到声子极化激元及约0.09的归一化耦合强度,证明可借电磁环境调控材料力学、磁与拓扑自由度。

摘要:

我们报告了太赫兹时域光谱(TDTS)实验,证明在一种太赫兹(THz)LC超材料中存在强光-物质耦合:该超材料中拓扑绝缘体(TI)薄膜的声子共振与电子开口环谐振器阵列的光子模式相耦合。当我们将超材料共振频率调谐穿过(Bi_xSb_{1-x})_2Te_3(BST)低频α模式的频率时,观察到声子与超材料共振之间的强烈混合和能级排斥。这种混合共振是一种声子极化激元。利用测得的真空拉比频率和腔体共振,我们观察到归一化耦合强度η = Ω_R/ω_c ≈ 0.09。我们的结果表明,人们可以通过改变材料的电磁环境来调节材料的力学性质,并以此方式通过与晶格的耦合来改变其磁自由度和拓扑自由度。

英文摘要:

We report terahertz time-domain spectroscopy (TDTS) experiments demonstrating strong light-matter coupling in a terahertz (THz) LC-metamaterial in which the phonon resonance of a topological insulator (TI) thin film is coupled to the photonic modes of an array of electronic split-ring resonators. As we tune the metamaterial resonance frequency through the frequency of the low frequency $α$ mode of (Bi$_x$Sb$_{1-x}$)$_2$Te$_3$ (BST), we observe strong mixing and level repulsion between phonon and metamaterial resonance. This hybrid resonance is a phonon polariton. We observe a normalized coupling strength, $η$ = $Ω_R$/$ω_c$ $\approx$ 0.09, using the measured vacuum Rabi frequency and cavity resonance. Our results demonstrate that one can tune the mechanical properties of materials by changing their electromagnetic environment and therefore modify their magnetic and topological degrees of freedom via coupling to the lattice in this fashion.

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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