arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.08374cond-mat.mtrl-sci
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杂质半导体中的复合激子态

Composite excitonic states in doped semiconductors

Dinh Van Tuan, Hanan Dery

摘要:

提出了一个杂质半导体中复合激子态的理论模型。多体之间的相互作用的光激发的电子-空穴对和电子气被集成到一个计算易处理的少体问题,通过变分法求解。由于ML-MoSe $_2$和ML-WSe $_2$的导带性质不同,本文重点研究了它们的电子掺杂。在这两种情况下,复合材料的核心是一个紧密结合的三电子(两个电子和价带空穴),周围是一个耗尽电子的区域。ML-WSe $_2$中的复合物还包括具有不同量子数的卫星电子。该理论是通用的,可以应用于具有各种能带特性的半导体,允许计算它们的激子态并量化与费米海的相互作用。

英文摘要:

We present a theoretical model of composite excitonic states in doped semiconductors. Many-body interactions between a photoexcited electron-hole pair and the electron gas are integrated into a computationally tractable few-body problem, solved by the variational method. We focus on electron-doped ML-MoSe$_2$ and ML-WSe$_2$ due to the contrasting character of their conduction bands. In both cases, the core of the composite is a tightly-bound trion (two electrons and valence-band hole), surrounded by a region depleted of electrons. The composite in ML-WSe$_2$ further includes a satellite electron with different quantum numbers. The theory is general and can be applied to semiconductors with various energy-band properties, allowing one to calculate their excitonic states and to quantify the interaction with the Fermi sea.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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