Quantum Electrodynamic Control of Matter: Cavity-Enhanced Ferroelectric Phase Transition
Quantum Electrodynamic Control of Matter: Cavity-Enhanced Ferroelectric Phase Transition
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DOI：
10.1103/physrevx.10.041027
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发表时间：
2020-11-06
影响因子：
12.5
通讯作者：
Demler, Eugene
中科院分区：
文献类型：
--
作者：
Ashida, Yuto;Imamoglu, Atac;Demler, Eugene
光与物质的相互作用可以用来定性地改变材料的物理性质。最近的理论和实验研究已经探索了这种通过强经典电磁辐射驱动多体系统的光控制物质的可能性，导致电子或晶格自由度的时间依赖性哈密顿量。为了避免不可避免的加热，到目前为止，使用超短激光脉冲的泵浦-探测装置已经被用于研究材料中的瞬态光诱导改性。在这里，我们追求通过修改电磁环境的量子涨落来控制量子物质的另一个方向。与先前提出的光增强电子-电子相互作用不同，我们考虑了一个偶极量子多体系统，该系统嵌入由金属镜组成的腔中，并在量子光-物质相互作用的基础上建立了一个理论框架来操纵其平衡性质。我们分析了不同类型的基本激发杂交，包括偶极声子，腔光子，和金属镜中的等离子体激元，所产生的强光-物质相互作用的制度中的腔限制。这种混合定性地改变了集体激发的性质，并可用于在广泛的平台中选择性地控制能级结构。最值得注意的是，在量子顺电，我们表明，腔诱导软化的红外光学声子增强铁电相相比，散装材料。我们的研究结果提出了一个有趣的可能性，诱导超辐射型转变通过光物质耦合没有外部泵浦。我们还讨论了腔诱导的集体激发的修改分子材料和激子器件的可能应用。
The light-matter interaction can be utilized to qualitatively alter physical properties of materials. Recent theoretical and experimental studies have explored this possibility of controlling matter by light based on driving many-body systems via strong classical electromagnetic radiation, leading to a time-dependent Hamiltonian for electronic or lattice degrees of freedom. To avoid inevitable heating, pump-probe setups with ultrashort laser pulses have so far been used to study transient light-induced modifications in materials. Here, we pursue yet another direction of controlling quantum matter by modifying quantum fluctuations of its electromagnetic environment. In contrast to earlier proposals on light-enhanced electron-electron interactions, we consider a dipolar quantum many-body system embedded in a cavity composed of metal mirrors and formulate a theoretical framework to manipulate its equilibrium properties on the basis of quantum light-matter interaction. We analyze hybridization of different types of the fundamental excitations, including dipolar phonons, cavity photons, and plasmons in metal mirrors, arising from the cavity confinement in the regime of strong light-matter interaction. This hybridization qualitatively alters the nature of the collective excitations and can be used to selectively control energy-level structures in a wide range of platforms. Most notably, in quantum paraelectrics, we show that the cavity-induced softening of infrared optical phonons enhances the ferroelectric phase in comparison with the bulk materials. Our findings suggest an intriguing possibility of inducing a superradiant-type transition via the light-matter coupling without external pumping. We also discuss possible applications of the cavity-induced modifications in collective excitations to molecular materials and excitonic devices.