论文标题
腔合式单层半导体的显微镜理论：北极星引起的山谷松弛，以及通过手性强耦合增强和控制山谷伪植物的前景
Microscopic theory of cavity-confined monolayer semiconductors: polariton-induced valley relaxation and the prospect of enhancing and controlling the valley pseudospin by chiral strong coupling
论文作者
论文摘要
我们在腔体限制的单层过渡金属二盐元中应用了激子 - 两极的微观理论，其中包括单层平面中的两个光极极化，从而可以描述手性腔光子如何与活性材料自由度的Valley Valley相互作用。偏振子形成后，居住在两个不相等山谷中的退化激子被证明是由于空腔介导的插入式Interavalley相互作用与Intervalley库仑相互作用的结合而假设粘结和抗抑制叠加。这代表了极化诱导的山谷极化的相干混合。结合疾病，这种混合容易打开一个新的山谷松弛通道，该通道随着腔耦合的增加而具有重要意义。重要的是，我们表明，左手和右圆形光子光子具有不对称反射率的光腔提供了一个相当健壮的平台，可以实现保守的山谷极化，因为激子的山谷定位被非对称的狂犬病散布恢复，从而提高了他们的退化。此外，我们显示了这种退化的举重，以通过极化诱导的手性鲜明效应，从而使波长选择对山谷的伪造，从而为Valleytronic应用提供了有趣的机会。
We apply a microscopic theory of exciton-polaritons in cavity-confined monolayer transition-metal dichalcogenides including both optical polarizations in the monolayer plane, allowing to describe how chiral cavity photons interact with the valley degrees of freedom of the active material. Upon polariton formation, the degenerate excitons inhabiting the two inequivalent valleys are shown to assume bonding and antibonding superpositions as a result of cavity-mediated intravalley interactions combined with intervalley Coulomb interactions. This is representative of a polariton-induced coherent mixing of the valley polarization. In combination with disorder, this mixing is prone to open a new valley relaxation channel which attains significance with increasing cavity coupling. Importantly, we show that optical cavities with an asymmetric reflectance of left- and right-handed circularly-polarized photons offer a considerably more robust platform to realize a conserved valley polarization, as the valley localization of excitons is reinstated by an asymmetric Rabi splitting which lifts their degeneracy. Moreover, we show this degeneracy lifting to allow for wavelength-selective access to the valley pseudospin by means of a polariton-induced chiral Stark effect, offering interesting opportunities for valleytronic applications.
