论文标题
在有限温度下掺杂的二维半导体中，从激子极化物到Trions的跨界
Crossover from exciton polarons to trions in doped two-dimensional semiconductors at finite temperature
论文作者
论文摘要
我们系统地研究温度在掺杂二维半导体的光学响应中的作用。通过利用有限的费米 - 棕榈理论，我们揭示了从具有明确定义的偏振子准粒子到高温或低掺杂的不一致的机制的交叉，其中最低能量“有吸引力的”极性层粒子被摧毁，被摧毁，成为宽阔的Trion trion ronum contanuum。我们证明了交叉伴随着吸收和光致发光的质量重大变化。特别是，随着温度升高（或掺杂量的降低），有吸引力的分支的发射曲线从对称的Lorentzian演变为不对称峰，并具有指数式尾巴，涉及有限动量的Trions和后座电子。 We discuss the effect of temperature on the coupling to light for structures embedded into a microcavity, and we show that there can exist well-defined polariton quasiparticles even when the exciton-polaron quasiparticle has been destroyed, where the transition from weak to strong light-matter coupling can be explained in terms of the polaron linewidths and spectral weights.
We study systematically the role of temperature in the optical response of doped two-dimensional semiconductors. By making use of a finite-temperature Fermi-polaron theory, we reveal a crossover from a quantum-degenerate regime with well-defined polaron quasiparticles to an incoherent regime at high temperature or low doping where the lowest energy "attractive" polaron quasiparticle is destroyed, becoming subsumed into a broad trion-hole continuum. We demonstrate that the crossover is accompanied by significant qualitative changes in both absorption and photoluminescence. In particular, with increasing temperature (or decreasing doping), the emission profile of the attractive branch evolves from a symmetric Lorentzian to an asymmetric peak with an exponential tail involving trions and recoil electrons at finite momentum. We discuss the effect of temperature on the coupling to light for structures embedded into a microcavity, and we show that there can exist well-defined polariton quasiparticles even when the exciton-polaron quasiparticle has been destroyed, where the transition from weak to strong light-matter coupling can be explained in terms of the polaron linewidths and spectral weights.
