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Biexciton oscillator strength

机译：双激子振荡器强度

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摘要

Our goal is to provide a physical understanding of the elementary coupling between photon and biexciton and to derive the physical characteristics of the biexciton oscillator strength, following the procedure we used for trion. Instead of the more standard two-photon absorption, this work concentrates on molecular biexciton created by photon absorption in an exciton gas. We first determine the appropriate set of coordinates in real and momentum spaces to describe one biexciton as two interacting excitons. We then turn to second quantization and introduce the "Fourier transform in the exciton sense" of the biexciton wave function, which is the relevant quantity for oscillator strength. We find that, like for trion, the oscillator strength for the formation of one biexciton out of one photon plus a single exciton is extremely small; it is one biexciton volume divided by one sample volume smaller than the exciton oscillator strength. However, due to their quantum nature, trion and biexciton have absorption lines, which behave quite differently. Electrons and trions are fermionic particles impossible to pile up all at the same energy. This would make the weak trion line spread with electron density, the peak structure only coming from singular many-body effects. By contrast, the bosonic nature of exciton and biexciton makes the biexciton peak mainly rise with exciton density, this rise being simply linear if we forget many-body effects between the photocreated exciton and the excitons present in the sample.
机译：我们的目标是提供对光子与双激子之间基本耦合的物理理解，并遵循我们用于三重子的程序，得出双激子振荡器强度的物理特性。代替更标准的双光子吸收，这项工作集中在由激子气体中光子吸收产生的分子双激子上。我们首先确定真实空间和动量空间中的适当坐标集，以将一个双激子描述为两个相互作用的激子。然后，我们转到第二量化，并引入双激子波函数的“在激子意义上的傅立叶变换”，这是与振荡器强度有关的量。我们发现，与三重奏一样，从一个光子加一个激子中形成一个双激子的振荡器强度非常小；它是一个双激子体积除以一个比激子振荡器强度小的样本量。但是，由于它们的量子性质，重子和双激子具有吸收线，它们的行为截然不同。电子和tri子是费米离子粒子，不可能在相同的能量下全部堆积。这将使弱三极子线随电子密度扩展，其峰结构仅来自奇异的多体效应。相比之下，激子和双激子的玻色性质使双激子峰主要随激子密度的增加而上升，如果我们忘记了光生激子和样品中存在的激子之间的多体效应，则这种上升只是线性的。

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  • 来源
    《Physical review》 |2009年第20期|205313.1-205313.12|共12页
  • 作者

    M. Combescot; O. Betbeder-Matibet;

  • 作者单位

    Institut des NanoSciences de Paris, Universite Pierre et Marie Curie-CNRS, Campus Boucicaut, 140 rue de Lourmel, 75015 Paris, France;

    Institut des NanoSciences de Paris, Universite Pierre et Marie Curie-CNRS, Campus Boucicaut, 140 rue de Lourmel, 75015 Paris, France;

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  • 正文语种 eng
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  • 关键词

    excitons and related phenomena;

    机译：激子及相关现象;

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