当前位置: X-MOL 学术Phys. Rev. Research › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Controlling exciton many-body states by the electric-field effect in monolayerMoS2
Physical Review Research Pub Date : 2021-04-30 , DOI: 10.1103/physrevresearch.3.l022009
J. Klein , A. Hötger , M. Florian , A. Steinhoff , A. Delhomme , T. Taniguchi , K. Watanabe , F. Jahnke , A. W. Holleitner , M. Potemski , C. Faugeras , J. J. Finley , A. V. Stier

We report magneto-optical spectroscopy of gated monolayer MoS2 in high magnetic fields up to 28T and obtain new insights on the many-body interaction of neutral and charged excitons with the resident charges of distinct spin and valley texture. For neutral excitons at low electron doping, we observe a nonlinear valley Zeeman shift due to dipolar spin-interactions that depends sensitively on the local carrier concentration. As the Fermi energy increases to dominate over the other relevant energy scales in the system, the magneto-optical response depends on the occupation of the fully spin-polarized Landau levels (LL) in both K/K valleys. This manifests itself in a many-body state. Our experiments demonstrate that the exciton in monolayer semiconductors is only a single particle boson close to charge neutrality. We find that away from charge neutrality it smoothly transitions into polaronic states with a distinct spin-valley flavor that is defined by the LL quantized spin and valley texture.

中文翻译:

通过单层MoS2中的电场效应控制激子多体态

我们报道了门控单层的磁光光谱 硫化钼2个 在高磁场下 28岁Ť并获得有关中性和带电激子与具有明显自旋和谷型纹理的常驻电荷的多体相互作用的新见解。对于低电子掺杂的中性激子,我们观察到由于偶极自旋相互作用而引起的非线性谷塞曼位移,该位移敏感地取决于局部载流子浓度。随着费米能量的增加,在系统中其他相关能量标度上占主导地位,磁光响应取决于两个系统中完全自旋极化的朗道能级(LL)的占据ķ/ķ山谷。这表现为多体状态。我们的实验表明,单层半导体中的激子只是接近电荷中性的单个粒子玻色子。我们发现,从电荷中性开始,它可以平滑地转变为具有独特的自旋谷味的极化子状态,该自旋谷味由LL量化的自旋和峰谷纹理定义。
更新日期:2021-04-30
down
wechat
bug