论文标题
极性声子对激子特性的重新归一化
Renormalization of excitonic properties by polar phonons
论文作者
论文摘要
我们采用准粒子路径积分分子动力学来研究模型半导体的激子特性如何通过电子音波耦合改变。我们描述了系统的路径积分表示中的方式，以评估在存在波动晶格的情况下，激子的重新分配质量，结合能和辐射重组速率。为了说明这种方法，我们考虑了Fröhlich-type电子 - 光子量相互作用，并采用虚构的时间影响功能，以非扰动地纳入声子诱导的效果。将有效的质量和结合能与扰动和变异方法进行比较，这些方法提供了定性一致的趋势。我们评估了通过陷阱辅助和双分子过程介导的电子孔重组率，从而开发了一种一致的统计机械方法，在反应有限的制度中有效。这些计算证明了声子如何筛选电子孔相互作用，通常会降低激子结合能并增加其辐射寿命。
We employ quasiparticle path integral molecular dynamics to study how the excitonic properties of model semiconductors are altered by electron-phonon coupling. We describe ways within a path integral representation of the system to evaluate the renormalized mass, binding energy, and radiative recombination rate of excitons in the presence of a fluctuating lattice. To illustrate this approach, we consider Fröhlich-type electron-phonon interactions and employ an imaginary time influence functional to incorporate phonon-induced effects nonperturbatively. The effective mass and binding energies are compared with perturbative and variational approaches, which provide qualitatively consistent trends. We evaluate electron-hole recombination rates as mediated through both trap-assisted and bimolecular processes, developing a consistent statistical mechanical approach valid in the reaction limited regime. These calculations demonstrate how phonons screen electron-hole interactions, generically reducing exciton binding energies and increasing their radiative lifetimes.
