开放腔中二维激子发射的非凡光学自旋霍尔效应

中文摘要 AI 辅助

开放腔正成为研究光与物质相互作用的一个有前景的平台。一个有损耗的开放腔与原子单层耦合，在室温下产生抛物线色散发射。在此情况下，光与物质的相互作用较弱，色散源于一种称为暗强耦合的现象。明亮的二维激子通过腔模迅速衰减，留下二维晶格的自旋暗激子，从而发生对称性破缺。进一步，在k空间中对偏振依赖性的映射揭示了耦合系统中的自旋轨道相互作用。构建了一个合成自旋轨道哈密顿量，以提取开放腔中Rashba型和Dresselhaus型相互作用的有效贡献。该系统在室温下显示出自旋轨道效应的清晰演化。此处，发射对偏振敏感，产生高程度的线偏振和圆偏振。这是研究光子自旋轨道耦合的最简单配置之一，其中原子单层分别提供24 eV Å的Rashba耦合常数和约10^5 eV Å^2的Dresselhaus耦合常数。因此，开放腔平台对于偏振敏感测量和器件应用具有前景。

英文摘要

Open cavities are emerging as a promising platform for studying light-matter interactions. A lossy open cavity couples to an atomic monolayer, resulting in parabolic dispersive emission at room temperature. Here, light-matter interaction is weak, and the dispersion arises from a phenomenon known as dark strong coupling. The bright 2D exciton rapidly decays through the cavity mode, leaving behind spin-dark excitons of the 2D lattice, thereby undergoing symmetry breaking. Further, mapping the polarisation dependence in the k-space reveals spin-orbit interaction in the coupled system. A synthetic spin-orbit Hamiltonian is constructed to extract the effective contributions of Rashba- and Dresselhaus-type interactions in the open cavity. The system shows a clear evolution of the spin-orbit effect at room temperature. Here, emission is polarisation-sensitive, yielding high degrees of linear and circular polarisation. This is one of the simplest configurations for studying photonic spin-orbit coupling, in which an atomic monolayer provides Rashba and Dresselhaus coupling constants of 24 eV Å, and ~10^5 eV Å^2, respectively. Therefore, an open cavity platform is promising for polarisation-sensitive measurements and device applications.

发表机构

• Indian Institute of Science Education and Research (IISER) Mohali（印度科学教育研究所（IISER）莫哈利分校）
• Indian Institute of Science Education and Research (IISER) Thiruvananthapuram（印度科学教育研究所（IISER）特鲁凡恩纳塔普拉姆分校）

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32 pages, 13 figures