Many-body effects on excitonic optical properties of photoexcited semiconductor quantum wire structures
Many-body effects on excitonic optical properties of photoexcited semiconductor quantum wire structures
复制标题
多体效应对光激发半导体量子线结构激子光学性质的影响
DOI：
10.1103/physrevb.64.195313
复制
发表时间：
2001
影响因子：
3.7
通讯作者：
S. Sarma
中科院分区：
文献类型：
--
作者：
D. W. Wang;S. Sarma
我们通过使用载流子之间的真实库仑相互作用求解动态筛选的 Bethe-Salpeter 方程，研究了载流子相互作用引起的多体效应对高度光激发一维半导体量子线系统的激子光学性质的影响。包括电子/空穴自能和电子-空穴相互作用顶点函数中的动态屏蔽效应，我们发现，对于大范围的光激发密度（$n= 0-6\times 10^5$ cm$^{-1}$），激子吸收本质上在恒定能量处达到峰值，高于此吸收峰消失而没有明显的增益，即观察到\textit{no}激子到自由电子空穴等离子体莫特跃迁，与之前的理论结果相反，但与最近的实验结果一致。这种增益的缺失（或莫特跃迁的不存在）是由一维等离子体激元或电荷密度激发产生的强非弹性散射引起的，与一维系统的非费米液体性质密切相关。我们的理论工作证明了一维光激发电子空穴系统中与低密度区域（$n 10^5$ cm$^{-1}$）中非相互作用激子稀气体相关的有效费米液体行为的转变或交叉。还对该问题进行了传统的准静态近似，以与完整的动态结果进行比较。激子结合能和吸收光谱的数值结果作为载流子密度和温度的函数给出。
We study carrier interaction induced many-body effects on the excitonic optical properties of highly photoexcited one-dimensional semiconductor quantum wire systems by solving the dynamically screened Bethe-Salpeter equation using realistic Coulomb interaction between carriers. Including dynamical screening effects in the electron/hole self-energy and in the electron-hole interaction vertex function, we find that the excitonic absorption is essentially peaked at a constant energy for a large range of photoexcitation density ($n= 0-6\times 10^5$ cm$^{-1}$), above which the absorption peak disappears without appreciable gain i.e., \textit{no} exciton to free electron-hole plasma Mott transition is observed, in contrast to previous theoretical results but in agreement with recent experimental findings. This absence of gain (or the non-existence of a Mott transition) arises from the strong inelastic scattering by one-dimensional plasmons or charge density excitations, closely related to the non-Fermi liquid nature of one-dimensional systems. Our theoretical work demonstrates a transition or a crossover in one-dimensional photoexcited electron-hole system from an effective Fermi liquid behavior associated with a dilute gas of noninteracting excitons in the low density region ($n 10^5$ cm$^{-1}$). The conventional quasi-static approximation for this problem is also carried out to compare with the full dynamical results. Numerical results for exciton binding energy and absorption spectra are given as functions of carrier density and temperature.
S. Matsubara：“4. 体内典型和非典型抗精神病药物对多巴胺 D-1、D-2 和血清素 2 受体的占用。”
DOI：
--
发表时间：
--
期刊：
影响因子：
--
作者：
通讯作者：
--