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arXiv 2203.11029cond-mat.mes-hall
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远红外光子腔场对正方形量子点阵列磁化强度的影响

The effects of a far-infrared photon cavity field on the magnetization of a square quantum dot array

Vidar Gudmundsson, Vram Mughnetsyan, Nzar Rauf Abdullah, Chi-Shung Tang, Valeriu Moldoveanu, Andrei Manolescu

摘要:

利用量子电动力学密度泛函理论(QEDFT)计算了GaAs异质结构中腔嵌入量子点阵列的轨道和自旋磁化强度.为此,最近采用的基于梯度的交换相关功能的原子系统是适应托管二维电子气(2DEG)提交到一个外部垂直均匀磁场。数值结果揭示了腔场对电子电荷分布的极化效应和轨道磁化强度的非平凡变化。我们讨论了它的纠缠依赖于每个点的电子数,并在电子-光子耦合强度。特别是,作为电子-光子耦合强度的函数的费米能量周围的光子修饰的电子状态的计算的分散体指示在点中的磁等离子体激元极化激元的形成。

英文摘要:

The orbital and spin magnetization of a cavity-embedded quantum dot array defined in a GaAs heterostructure are calculated within quantum-electrodynamical density-functional theory (QEDFT). To this end a gradient-based exchange-correlation functional recently employed for atomic systems is adapted to the hosting two-dimensional electron gas (2DEG) submitted to an external perpendicular homogeneous magnetic field. Numerical results reveal the polarizing effects of the cavity photon field on the electron charge distribution and nontrivial changes of the orbital magnetization. We discuss its intertwined dependence on the electron number in each dot, and on the electron-photon coupling strength. In particular, the calculated dispersion of the photon-dressed electron states around the Fermi energy as a function of the electron-photon coupling strength indicates the formation of magnetoplasmon-polaritons in the dots.

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