论文标题
$ n $掺杂的ws $ _2 $单层中的激子综合体
Excitonic complexes in $n$-doped WS$_2$ monolayer
论文作者
论文摘要
我们研究了使用外部磁场和第一原则计算中嵌入在六边形BN层中的$ n $ oped ws $ _2 $单层的低温光致发光光谱中明显的发射线的起源。除了中立的激子线外，所有观察到的发射线都与带负电荷的激子有关。因此，由于明亮（单线和三重态）以及深色（自旋和动量 - 孔）负Trions以及后者光学不活跃的复合物的声子复制品，我们确定了排放。区分了半黑暗的Trions和负Biexciton。根据他们的实验提取和理论上计算的$ g $因素，我们确定了由于WS $ _2 $中的激子络合物而导致的三个不同的排放家族：明亮，Interavalley和Intervalley Dark。还确定了传导和价带中的自旋分裂子带的$ g $ factor。
We investigate the origin of emission lines apparent in the low-temperature photoluminescence spectra of $n$-doped WS$_2$ monolayer embedded in hexagonal BN layers using external magnetic fields and first-principles calculations. Apart from the neutral A exciton line, all observed emission lines are related to the negatively charged excitons. Consequently, we identify emissions due to both the bright (singlet and triplet) and dark (spin- and momentum-forbidden) negative trions as well as the phonon replicas of the latter optically-inactive complexes. The semi-dark trions and negative biexcitons are distinguished. Based on their experimentally extracted and theoretically calculated $g$-factors, we identify three distinct families of emissions due to exciton complexes in WS$_2$: bright, intravalley and intervalley dark. The $g$-factors of the spin-split subbands in both the conduction and valence bands are also determined.
