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arXiv 2501.04736cond-mat.mes-hallphysics.optics
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探究光学腔中激子绝缘体的集体激发

Probing the collective excitations of excitonic insulators in an optical cavity

Elahe Davari, Mehdi Kargarian

AI总结:

本研究利用准一维晶格模型探究光学腔中激子绝缘体相的光物质耦合效应,发现激子态集体模与腔光子耦合会导致光子色散出现能带免交叉,该现象为激子绝缘体独有。

摘要:

光学腔中的光与物质相互作用为创造杂化态和调控材料性质提供了有前景的平台。在本研究中,我们利用一个在每个格点具有两个相反宇称轨道的准一维晶格模型,考察了光物质耦合在激子绝缘体相中的效应。我们表明,该模型允许集体相位模与腔光子之间存在耦合。我们的发现揭示,激子态的集体模显著影响了腔模的色散,在光子色散中引起了能带免交叉。这一现象在平庸和拓扑绝缘体相以及声子介导的激子绝缘体中均不存在,凸显了激子绝缘体中集体激发的独特性质。我们的结果证明了光物质相互作用在存在激子集体激发时对光子传播的显著影响。

英文摘要:

The light--matter interaction in optical cavities offers a promising ground to create hybrid states and manipulate material properties. In this work, we examine the effect of light-matter coupling in the excitonic insulator phase using a quasi one-dimensional lattice model with two opposite parity orbitals at each site. We show that the model allows for a coupling between the collective phase mode and cavity photons. Our findings reveal that the collective mode of the excitonic state significantly impacts the dispersion of the cavity mode, giving rise to an avoiding band crossing in the photon dispersion. This phenomenon is absent in trivial and topological insulator phases and also in phonon-mediated excitonic insulators, underscoring the unique characteristics of collective excitations in excitonic insulators. Our results demonstrate the significant impact of light-matter interaction on photon propagation in the presence of excitonic collective excitations.

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