论文标题
二维半导体中带电激子的光学特性
Optical properties of charged excitons in two-dimensional semiconductors
论文作者
论文摘要
在原子上稀薄的过渡金属二分法中，强烈的库仑相互作用使这些系统特别有望用于兴奋性物理学研究。特别感兴趣的是二维半导体的光学性质中带电的激子（也称为Trions）的表现。为了描述这种系统的光学响应，应明确考虑与居民电子的激子相互作用。在本文中，我们证明这可以在TRION（本质上是很少的粒子）和费米 - 果龙（多体）方法中进行，只要电子密度足够低，并且TRION结合能比激子元素小得多。在这里，我们考虑了与带电的激子，Trions和Zeeman效应的精细结构以及Trions的光致发光有关的光学转变的振荡器强度，这些振动型表明了几个粒子和多体模型的适用性。
Strong Coulomb interaction in atomically-thin transition metal dichalcogenides makes these systems particularly promising for studies of excitonic physics. Of special interest are the manifestations of the charged excitons, also known as trions, in the optical properties of two-dimensional semiconductors. In order to describe the optical response of such a system, the exciton interaction with resident electrons should be explicitly taken into account. In this paper we demonstrate that this can be done both in the trion (essentially, few-particle) and Fermi-polaron (many-body) approaches, which produce equivalent results provided that the electron density is sufficiently low and the trion binding energy is much smaller than the exciton one. Here we consider the oscillator strengths of the optical transitions related to the charged excitons, fine structure of trions and Zeeman effect, as well as photoluminescence of trions illustrating the applicability of both few-particles and many-body models.
