论文标题
原子薄半导体中掺杂依赖的光学响应的激子理论
Excitonic theory of doping-dependent optical response in atomically thin semiconductors
论文作者
论文摘要
原子上薄的半导体中光激发激发子与残留掺杂密度的相互作用导致多体效应，这些效应是通过外栅极电压连续调谐的。在这里，我们开发了一种完全的显微镜理论，以描述原子薄的过渡金属二核苷中激素特性的掺杂依赖性操纵。特别是，我们为schrödinger方程建立了对角度化方法，该方法表征了虚拟激子与费米海掺杂剂的相互作用。求解这个多体的Schrödinger方程提供了对TRION的访问以及散射状态的连续性。 Heisenberg运动方程将耦合激子，TRIONS和散射连续性的动力学描述，包括均值场贡献和由于激子与Trions和Trions和散射连续性状态的相互作用而引起的相关效应。我们对靠近带边缘的光激励的计算揭示了掺杂对激子共振的影响，并不仅鉴定了地面 - 也激发的状态TRION共振。
The interaction of optically excited excitons in atomically thin semiconductors with residual doping densities leads to many-body effects which are continuously tunable by external gate voltages. Here, we develop a fully microscopic theory to describe the doping-dependent manipulation of the excitonic properties in atomically thin transition metal dichalcogenides. In particular, we establish a diagonalization approach for the Schrödinger equation which characterizes the interaction of a virtual exciton with the Fermi sea of dopants. Solving this many-body Schrödinger equation provides access to trions as well as a continuum of scattering states. The dynamics of coupled excitons, trions, and scattering continua is subsequently described by Heisenberg equations of motion including mean-field contributions and correlation effects due to the interaction of excitons with trions and scattering continuum states. Our calculations for optical excitation close to the band edge reveal the influence of doping on the exciton resonances in combination with the simultaneous identification of not only ground-, but also excited-, state trion resonances.
