发表机构
Institute of Physics, Johannes Gutenberg University Mainz（美因茨约翰内斯·古腾堡大学物理研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出偏置铁磁电子-空穴双层实现磁振子与激子共振耦合，证明线性杂化及玻色-爱因斯坦凝聚，并揭示密度-密度相互作用修正及集体模式杂化，提供激子凝聚检测新途径。
AI 中文摘要
二维磁性半导体提供了一个独特的平台，在该平台上可以实现强磁振子-激子相互作用。然而，由于激子与磁振子之间固有的能量失配，这些相互作用通常发生在激子密度与磁振子之间。我们提出了偏置铁磁电子-空穴双层结构，其中激子能隙可通过电压偏置降低，作为激子与磁振子能够共振耦合的平台。从电子与局域磁矩之间的微观交换相互作用出发，我们证明了在该体系中磁振子与自旋翻转激子发生线性杂化。随着激子能量进一步降低，形成了磁振子-激子玻色-爱因斯坦凝聚体。我们展示了该凝聚体进一步受到吸引性的磁振子-激子密度-密度相互作用的修正，该相互作用我们通过微观推导得出。我们研究了凝聚体的集体模式，并证明了它们与磁振子的杂化，为激子凝聚体的形成提供了一种替代检测机制。
英文摘要
The hybridization of magnons and excitons would combine magnetic and optical degrees of freedom in a single composite quasiparticle. Such a hybridization is however difficult to achieve, because of their inherent energy mismatch. We propose that in biased bipolar ferromagnetic electron--hole bilayers the excitons and magnons can be brought into resonance, with the exciton energy lowered through the voltage bias to match the magnon energies. We demonstrate the linear hybridization of magnons and spin-flip excitons in this regime, starting from the microscopic exchange interactions between electrons and localized magnetic moments. We show that further increasing the gate voltage softens the hybrid magnon--exciton mode and realizes a magnon--exciton condensate, which manifests in both the magnon and exciton sectors and is associated with spin-superfluid transport. Ferromagnetic electron--hole bilayers therefore provide a new platform for the study of composite magnon--exciton quasiparticles and the realization of spinful condensates and associated spin superfluidity.
