论文标题
增强的山谷Zeeman在Fe掺杂的单层MOS2中分裂
Enhanced Valley Zeeman Splitting in Fe-Doped Monolayer MoS2
论文作者
论文摘要
Zeeman效应提供了独特的机会来控制自由度的自由度（DOF）。最近，在液态氦气温度下，在二维过渡金属二分法（TMDS）中已证明了谷河谷的分裂，指的是山谷退化的提升。但是，要意识到山谷伪鞋的实际应用，山谷DOF必须在室温下通过磁场可以控制，这仍然是一个重大挑战。但是，TMD中的磁掺杂可以增强Zeeman分裂，但是在实验上实现这一目标并不容易。在这里，我们报告了在300 K（G = -6.4）和10 K（G = -11）的CVD生长的Fe -doped MOS2单层单层中分裂（G = -6.4）和10 K（G = -11）的明确磁操纵；有效的G因子可以通过增加Fe掺杂剂浓度来调整为-20.7，这与未掺杂的MOS2相比，这大约是5倍。我们的测量和计算表明，增强的分裂和GEFF因子是由于局部磁矩（Fe 3D电子）通过D-轨道杂交与MOS2的Heisenberg交换相互作用所致。
The Zeeman effect offers unique opportunities for magnetic manipulation of the spin degree of freedom (DOF). Recently, valley Zeeman splitting, referring to the lifting of valley degeneracy, has been demonstrated in two-dimensional transition metal dichalcogenides (TMDs) at liquid helium temperature. However, to realize the practical applications of valley pseudospins, the valley DOF must be controllable by a magnetic field at room temperature, which remains a significant challenge. Magnetic doping in TMDs can enhance the Zeeman splitting, however, to achieve this experimentally is not easy. Here, we report unambiguous magnetic manipulation of valley Zeeman splitting at 300 K (g = -6.4) and 10 K (g = -11) in a CVD-grown Fe-doped MoS2 monolayer; the effective g factor can be tuned to -20.7 by increasing the Fe dopant concentration, which represents an approximately fivefold enhancement as compared to undoped MoS2. Our measurements and calculations reveal that the enhanced splitting and geff factors are due to the Heisenberg exchange interaction of the localized magnetic moments (Fe 3d electrons) with MoS2 through the d-orbital hybridization.
