论文标题
摩西$ _2 $ / crbr $ _3 $ van der waals异质结构之间的自旋接近效应与电荷依赖性激子动态之间的相互作用
Interplay between spin proximity effect and charge-dependent exciton dynamics in MoSe$_2$ / CrBr$_3$ van der Waals heterostructures
论文作者
论文摘要
范德华异质结构中的半导体非磁性界面是一个独特的机会，可以研究磁性接近性相互作用，取决于包括山谷和伪造的多种现象，莫伊尔周期性，或异常强的coulomb结合。在这里，我们报告了Mose $ _2 $和CRBR $ _3 $的光致发光之间的电荷依赖性的依赖性，从而使Mose $ _2 $ trion State的Valley两极分化紧密地符合本地CRBR $ _3 $ _3 $ natizatization，而对中性兴奋状态则对ferrmomagagnet仍然不敏感。我们将其归因于依赖自旋依赖性的层间电荷转移，该层中的层层在激子和TRION辐射寿命之间发生的时间尺度。再进一步，我们通过磁光光效应和光致发光揭示了对比山谷极化的域状空间形状，我们推断为迷宫或其他高度复杂，具有与我们光学分辨率相对应的400 nm的特征。我们的发现提供了对短寿命山谷激子与旋转依赖性层间隧道之间相互作用的独特见解，同时还强调了Mose $ _2 $，这是一个有前途的候选人，可以在Van der Waals结构中与外来的旋转纹理进行光学接口。
Semiconducting ferromagnet-nonmagnet interfaces in van der Waals heterostructures present a unique opportunity to investigate magnetic proximity interactions dependent upon a multitude of phenomena including valley and layer pseudospins, moiré periodicity, or exceptionally strong Coulomb binding. Here, we report a charge-state dependency of the magnetic proximity effects between MoSe$_2$ and CrBr$_3$ in photoluminescence, whereby the valley polarization of the MoSe$_2$ trion state conforms closely to the local CrBr$_3$ magnetization, while the neutral exciton state remains insensitive to the ferromagnet. We attribute this to spin-dependent interlayer charge transfer occurring on timescales between the exciton and trion radiative lifetimes. Going further, we uncover by both the magneto-optical Kerr effect and photoluminescence a domain-like spatial topography of contrasting valley polarization, which we infer to be labyrinthine or otherwise highly intricate, with features smaller than 400 nm corresponding to our optical resolution. Our findings offer a unique insight into the interplay between short-lived valley excitons and spin-dependent interlayer tunnelling, while also highlighting MoSe$_2$ as a promising candidate to optically interface with exotic spin textures in van der Waals structures.
