论文标题
通过真实和人工磁场在原子薄晶体中操纵室温山谷 - 加油的激子 - 两极
Manipulation of room-temperature Valley-Coherent Exciton-Polaritons in atomically thin crystals by real and artificial magnetic fields
论文作者
论文摘要
在过渡金属二进制中，强的自旋轨道耦合和反转对称性破裂产生了依赖谷依赖的光学选择规则的有趣效果。因此，可以实质上具有手性光的山谷激子极化，然后再产生K和K-极化状态的连贯叠加。然而，在环境条件下，逐渐占主导地位，而山谷相干通常无法观察到。在这里，我们证明，如果WSE2的单个单层与高质量因子微腔的光学模式密切相关，则可以清楚地观察到山谷的连贯性。代表山谷相干叠加的相位的方位角矢量可以通过施加磁场直接操纵，此外，它对代表人造磁场的腔的极化各向异性也明智地反应。我们的结果与基于伪蛋白率方程的模型定性和定量一致，这构成了真实和伪磁场的影响。
Strong spin-orbit coupling and inversion symmetry breaking in transition metal dichalcogenide monolayers yield the intriguing effects of valley-dependent optical selection rules. As such, it is possible to substantially polarize valley excitons with chiral light and furthermore create coherent superpositions of K and K- polarized states. Yet, at ambient conditions dephasing usually becomes too dominant, and valley coherence typically is not observable. Here, we demonstrate that valley coherence is, however, clearly observable for a single monolayer of WSe2, if it is strongly coupled to the optical mode of a high quality factor microcavity. The azimuthal vector, representing the phase of the valley coherent superposition, can be directly manipulated by applying magnetic fields, and furthermore, it sensibly reacts to the polarization anisotropy of the cavity which represents an artificial magnetic field. Our results are in qualitative and quantitative agreement with our model based on pseudospin rate equations, accounting for both effects of real and pseudo-magnetic fields.
