AI 中文总结
该研究建立外磁场下掺杂二维半导体吸引型费米极化子的理论，揭示磁场与应变可调控其能谱与极化，为二维半导体多体激子准粒子光学响应调控提供互补工具。
AI 中文摘要
本文建立了外磁场下掺杂二维半导体中吸引型费米极化子能谱精细结构与极化的理论，计算了本征电荷载流子的谷极化费米海关联导致的费米极化子g因子重整化。研究了单轴应变下单层体系中塞曼分裂与应变诱导分裂的竞争关系。应变、磁场和电子密度的调控可实现能量分裂与本征态极化的连续调谐：线性偏振的应变诱导分裂双重态随磁场增强，其二次塞曼位移转变为线性塞曼分裂并伴随椭圆偏振。确定了临界磁场，超过该磁场后本征电荷载流子完全谷极化，仅存一个圆偏振费米极化子态。基于格林函数方法计算了吸引型费米极化子态的能级与斯托克斯参数，并引入简化的有效两能级模型，用于解析研究塞曼分裂与赝塞曼分裂的相互作用。计算了包括三激子光谱范围内圆二色性与线二色性在内的吸收与反射光谱。这些结果表明，真实磁场与应变诱导赝磁场为调控二维半导体中多体激子准粒子的光学响应提供了互补工具。
英文摘要
The theory of attractive Fermi polaron energy spectrum fine structure and polarization in doped two-dimensional semiconductors in external magnetic field is developed. Fermi polaron $g$ factor renormalization due to correlations with the valley-polarized Fermi sea of resident charge carriers is calculated. We study the competition between Zeeman and strain-induced splittings in monolayers under uniaxial strain. The control of strain, magnetic field and electron density allows continuous tuning of energy splitting and eigenstate polarization. Linearly polarized strain-induced split doublet exhibits quadratic Zeeman shift changing to linear Zeeman splitting with elliptical polarization with the increase of magnetic field. We identify a critical magnetic field above which resident charge carriers become fully valley polarized and only one circularly polarized Fermi polaron state remains. Within the Green's function approach we calculate energy levels and Stokes parameters of attractive Fermi polaron states and introduce a simplified effective two-level model allowing us to study analytically the interplay of Zeeman and pseudo-Zeeman splitting. We calculate absorption and reflection spectra, including circular and linear dichroism in the trion spectral range. These results show that real and strain-induced pseudomagnetic fields provide complementary tools for controlling the optical response of many-body excitonic quasiparticles in two-dimensional semiconductors.
