Coupled Metamaterial-Phonon Terahertz Range Polaritons in a Topological Insulator

被引：1

作者：

Mekonen, Sirak M. ^{[1
]}

Jain, Deepti ^{[2
,3
]}

Oh, Seongshik ^{[2
,3
]}

Armitage, N. P. ^{[1
]}

机构：

[1] Johns Hopkins Univ, William H Miller III Dept Phys & Astron, Baltimore, MD 21218 USA

[2] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[3] Ctr Quantum Mat Synth, Piscataway, NJ 08854 USA

来源：

ACS PHOTONICS | 2024年 / 11卷 / 06期

关键词：

phonon-polariton; metamaterials; topologicalinsulator; strong-coupling; split-ring resonators; normal mode splitting; terahertz; BI2SE3;

D O I：

10.1021/acsphotonics.3c01879

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We report terahertz time-domain spectroscopy experiments demonstrating strong light-matter coupling in a terahertz LC metamaterial (MM) in which the phonon resonance of a topological insulator thin film is coupled to the photonic modes of an array of electronic split ring resonators. As we tune the MM resonance frequency through the frequency of the low-frequency alpha mode of (BixSb1-x)(2)Te-3 (BST), we observe strong mixing and level repulsion between the phonon and MM resonance. This hybrid resonance is a phonon polariton. We observe a normalized coupling strength, eta = Omega(R)/omega(c) approximate to 0.09, using the measured vacuum Rabi frequency and cavity resonance. Our results demonstrate that one can tune the mechanical properties of these materials by changing their electromagnetic environment and therefore modify their magnetic and topological degrees of freedom via coupling to the lattice in this fashion.

引用

页码：2242 / 2246

页数：5

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