论文标题
通过受控的多体互动探测单层WS $ _2 $中的biexciton
Probing biexciton in monolayer WS$_2$ through controlled many-body interaction
论文作者
论文摘要
半导体过渡金属二进制基因源的单层构成强烈结合的激子复合物，并且是探索多体物理学的绝佳平台。在这里，我们通过使用稳态和时间分辨的光发光（PL）的系统依赖性，证明了五颗粒激发型复合物（带电的Biexciton）对激发能力，栅极电压和温度的系统依赖性。借助实验数据和速率方程模型的组合，我们认为带电的biexciton的结合能小于其峰与中性激子的光谱分离。我们还注意到，虽然中性激子的动量指导辐射重组受到光锥内的限制，但由于在动量空间中存在接近平行的激发和最终状态，因此对带电的Biexciton重组而放宽了这种限制。
The monolayers of semiconducting transition metal dichalcogenides host strongly bound excitonic complexes and are an excellent platform for exploring many-body physics. Here we demonstrate a controlled kinetic manipulation of the five-particle excitonic complex, the charged biexciton, through a systematic dependence of the biexciton peak on excitation power, gate voltage, and temperature using steady-state and time-resolved photoluminescence (PL). With the help of a combination of the experimental data and a rate equation model, we argue that the binding energy of the charged biexciton is less than the spectral separation of its peak from the neutral exciton. We also note that while the momentum-direct radiative recombination of the neutral exciton is restricted within the light cone, such restriction is relaxed for a charged biexciton recombination due to the presence of near-parallel excited and final states in the momentum space.
