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arXiv 2212.09600cond-mat.mes-hallcond-mat.mtrl-sci
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二维半导体材料中的三粒子(trion)团簇结构与结合能:Faddeev方程方法

Trion clustering structure and binding energy in 2D semiconductor materials: Faddeev equations approach

K. Mohseni, M. R. Hadizadeh, T. Frederico, D. R. da Costa, A. J. Chaves

AI总结:

本文用动量空间Faddeev方程研究二维MoS$_2$中的三粒子,提出红外与紫外两种正则化处理排斥RK势,得到一致结合能并揭示激子-电子主导团簇结构。

摘要:

在本工作中,我们发展了利用动量空间Faddeev方程研究半导体层状材料中三粒子的基本形式体系,所考虑的是处于二维空间中的三种不同粒子。针对应用于MoS$_2$层的短程单项可分离Yamaguchi势和Rytova-Keldysh(RK)相互作用,我们求解了三粒子Faddeev耦合积分方程。我们设计了两种不同的正则化方法,以克服在动量空间数值求解Faddeev方程时排斥性电子-电子RK势所带来的挑战。第一种方法在红外区域对排斥相互作用进行正则化,而第二种方法在紫外区域对其进行正则化。通过将三粒子能量外推至无屏蔽情形,两种方法对MoS$_2$层给出了一致的结果:在激子能量为$-753.3$ meV时,三粒子结合能为$-49.5(1)$ meV。我们详细分析了RK势和Yamaguchi势下的三粒子结构,展示了它们总体上的相似性以及占主导地位的团簇结构,即强束缚激子与一个电子弱束缚。我们发现,这一性质表现为两个Faddeev分量相对于空穴作为相互作用电子对旁观者的那个分量占优势。

英文摘要:

In this work, we develop the basic formalism to study trions in semiconductor layered materials using the Faddeev equations in momentum space for three different particles lying in two dimensions. We solve the trion Faddeev coupled integral equations for both short-range one-term separable Yamaguchi potential and Rytova-Keldysh (RK) interaction applied to the MoS$_2$ layer. We devise two distinct regularization methods to overcome the challenge posed by the repulsive electron-electron RK potential in the numerical solution of the Faddeev equations in momentum space. The first method regulates the repulsive interaction in the infrared region, while the second regulates it in the ultraviolet region. By extrapolating the trion energy to the situation without screening, the two methods gave consistent results for the MoS$_2$ layer with a trion binding energy of $-49.5(1)$~meV for the exciton energy of $-753.3$~meV. We analyzed the trion structure for the RK and Yamaguchi potentials in detail, showing their overall similarities and the dominant cluster structure, where the strongly bound exciton is weakly bound to an electron. We found that this property is manifested in the dominance of two of the Faddeev components over the one where the hole is a spectator of the interacting electron pair.

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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