论文标题
WSSE单层中的激子和Trions
Excitons and trions in WSSe monolayers
论文作者
论文摘要
在半导体过渡金属二北核化合物（S-TMD）合金中，带隙以及单层（MLS）中的电气和光学性质几乎线性调整的可能性为具有实体特征制造材料开辟了道路。通过使用光致发光光谱，我们研究了在SIO $ _2 $/SI基板上沉积的57/43的WSSE MLS的光学特性，并将其封装在六边形的BN片中。与$“ parent” $ ws $ _2 $和WSE $ _2 $ MLS类似，我们将WSSE MLS分配给具有深色地面激子州立的ML家族。我们发现，除了中性明亮的激子线外，三个观察到的发射线与带负电荷的激子有关。平面内和平面外磁场的应用使我们能够不可否认地分配明亮的和深色（自旋和动量 - 填充）负Trions以及深色自旋孔孔复合物的声子复制品。此外，还证明了WSSE ML中单个光子发射器的存在，从而促使机会扩大波长范围，以实现S-TMD的潜在量子应用。
The possibility of almost linear tuning of the band gap and of the electrical and optical properties in monolayers (MLs) of semiconducting transition metal dichalcogenide (S-TMD) alloys opens up the way to fabricate materials with on-demand characteristics. By making use of photoluminescence spectroscopy, we investigate optical properties of WSSe MLs with a S/Se ratio of 57/43 deposited on SiO$_2$/Si substrate and encapsulated in hexagonal BN flakes. Similarly to the $"parent"$ WS$_2$ and WSe$_2$ MLs, we assign the WSSe MLs to the ML family with the dark ground exciton state. We find that, in addition to the neutral bright A exciton line, three observed emission lines are associated with negatively charged excitons. The application of in-plane and out-of-plane magnetic fields allows us to assign undeniably the bright and dark (spin- and momentum-forbidden) negative trions as well as the phonon replica of the dark spin-forbidden complex. Furthermore, the existence of the single photon emitters in the WSSe ML is also demonstrated, thus prompting the opportunity to enlarge the wavelength range for potential future quantum applications of S-TMDs.
