论文标题
摩西$ _2 $单层中的氢化图片超出氢化图片的激子 - 外激体的互动
Exciton-exciton interaction beyond the hydrogenic picture in a MoSe$_2$ monolayer in the strong light-matter coupling regime
论文作者
论文摘要
在原子尺度厚度的过渡金属二分法层中，电子孔库仑相互作用势受到整个层平面介电函数的急剧不连续性的强烈影响。该特征导致奇特的非氢化激素激素状态，其中预测激子介导的光学非线性将被增强，而其氢化对应物将得到增强。为了证明这种增强，我们对摩西$ _2 $单层的光传递光谱进行了光学耦合方式，并具有光学微腔的模式，并使用非线性输入输入理论进行了定量分析结果。我们发现，相对于氢化图片中预期的现实值，激子 - 表面相互作用和激子费米饱和度的增强。这样的结果表明，Mose $ _2 $中的非常规激子对实施大型激子介导的光学非线性非常有利，这可能会达到室温。
In transition metal dichalcogenides layers of atomic scale thickness, the electron-hole Coulomb interaction potential is strongly influenced by the sharp discontinuity of the dielectric function across the layer plane. This feature results in peculiar non-hydrogenic excitonic states, in which exciton-mediated optical nonlinearities are predicted to be enhanced as compared to their hydrogenic counterpart. To demonstrate this enhancement, we performed optical transmission spectroscopy of a MoSe$_2$ monolayer placed in the strong coupling regime with the mode of an optical microcavity, and analyzed the results quantitatively with a nonlinear input-output theory. We find an enhancement of both the exciton-exciton interaction and of the excitonic fermionic saturation with respect to realistic values expected in the hydrogenic picture. Such results demonstrate that unconventional excitons in MoSe$_2$ are highly favourable for the implementation of large exciton-mediated optical nonlinearities, potentially working up to room temperature.
