论文标题
通过单层MOS中的电场效应来控制激子多体状态$ _2 $
Controlling exciton many-body states by the electric-field effect in monolayer MoS$_2$
论文作者
论文摘要
我们报告了高磁场的门控单层MOS $ _2 $的磁光谱，最高为28T，并获得有关中性和带电的激子的多体相互作用的新见解，并具有不同的旋转和山谷纹理的居民指控。对于低电子掺杂处的中性激子，我们观察到由于偶尔自旋相互作用而引起的非线性山谷Zeeman偏移，该旋转链接取决于局部载体浓度。随着费米能量在系统中的其他相关能量尺度上的主导地位，磁光响应取决于在$ k/k^{\ prime} $ valleys中的完全自旋极化的Landau水平的职业。这表现为多体状态。我们的实验表明，单层半导体中的激子只是一个接近电荷中性的单个粒子玻色子。我们发现，从电荷中立性中，它平稳地过渡到具有独特的自旋谷风味的极化状态，该味道由Landau水平量化的旋转和山谷质地定义。
We report magneto-optical spectroscopy of gated monolayer MoS$_2$ in high magnetic fields up to 28T and obtain new insights on the many-body interaction of neutral and charged excitons with the resident charges of distinct spin and valley texture. For neutral excitons at low electron doping, we observe a nonlinear valley Zeeman shift due to dipolar spin-interactions that depends sensitively on the local carrier concentration. As the Fermi energy increases to dominate over the other relevant energy scales in the system, the magneto-optical response depends on the occupation of the fully spin-polarized Landau levels in both $K/K^{\prime}$ valleys. This manifests itself in a many-body state. Our experiments demonstrate that the exciton in monolayer semiconductors is only a single particle boson close to charge neutrality. We find that away from charge neutrality it smoothly transitions into polaronic states with a distinct spin-valley flavour that is defined by the Landau level quantized spin and valley texture.
