论文标题
声子诱导的激子弱定位在二维半导体中
Phonon-induced exciton weak localization in two-dimensional semiconductors
论文作者
论文摘要
从理论上讲，我们研究了量子效应对原子薄晶体中激子扩散系数的贡献。这与闭合环上的激发波峰在轨迹上的干扰引起的弱定位有关。由于激子 - 音波相互作用的弱非弹性，即使激子被长波长的声音子散射，效果也存在。我们考虑与线性分散体和具有二次分散的弯曲声子与纵向声音子的激子相互作用。我们确定弱定位效应特别明显的制度。我们还简要介绍了自由电荷载体在激子量子传输中的作用，并且在自洽定位理论中，弱定位效应超出了最低顺序。
We study theoretically the contribution of quantum effects to the exciton diffusion coefficient in atomically thin crystals. It is related to the weak localization caused by the interference of excitonic wavefunctions on the trajectories with closed loops. Due to a weak inelasticity of the exciton-phonon interaction the effect is present even if the excitons are scattered by long-wavelength acoustic phonons. We consider exciton interaction with longitudinal acoustic phonons with linear dispersion and with flexural phonons with quadratic dispersion. We identify the regimes where the weak localization effect can be particularly pronounced. We also briefly address the role of free charge carriers in the exciton quantum transport and, within the self-consistent theory of localization, the weak localization effects beyond the lowest order.
