超强耦合二维电子中的非线性抗磁相互作用
Nonlinear Diamagnetic Interactions in Ultrastrongly Coupled 2D Electrons
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中文总结 AI 辅助
本研究针对超强耦合二维电子的抗磁相互作用，通过实验发现强太赫兹场会降低朗道极化激元的抗磁响应，提出带类Kerr相互作用的非线性Hopfield模型，为非线性腔量子电动力学开辟了新途径。
中文摘要 AI 辅助
量子Hopfield模型被广泛用于描述腔光子与固体中集体玻色型激发之间的超强光-物质耦合，其中抗磁相互作用通常被假定为常数。我们通过实验证明，在强太赫兹场激发下，朗道极化激元的抗磁响应会降低。我们表明，该行为源于场驱动的电子重新分布到GaAs导带的非抛物型区域，这会降低等离子体频率，进而减弱抗磁相互作用强度。一个微观热电子模型可复现观测到的非线性响应。受该微观图像启发，我们提出了带有类Kerr相互作用的Hopfield模型的非线性扩展版本。我们的结果为非线性腔量子电动力学和超越传统线性Hopfield描述的受驱超强光-物质耦合开辟了新途径，该途径能够产生诸如压缩光生成等独特的量子光学效应。
英文摘要
The quantum Hopfield model is widely used to describe ultrastrong light--matter coupling between cavity photons and collective bosonic excitations in solids, where the diamagnetic interaction is conventionally assumed to be a constant. We experimentally demonstrate that the diamagnetic response of Landau polaritons is reduced under strong terahertz field excitation. We show that this behavior originates from field-driven redistribution of electrons into the nonparabolic regime of the conduction band of GaAs, which reduces the plasma frequency and consequently the diamagnetic interaction strength. A microscopic hot-electron model reproduces the observed nonlinear response. Motivated by this microscopic picture, we propose a nonlinear extension of the Hopfield model with a Kerr-like interaction. Our results establish a route toward nonlinear cavity quantum electrodynamics and driven ultrastrong light--matter coupling beyond the conventional linear Hopfield description, which is capable of creating uniquely quantum optical effects such as squeezed light generation.
