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arXiv 2102.07368cond-mat.mes-hallquant-ph
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微扰法研究过渡金属双硫族化合物中激子的极化子位移

A perturbative approach to the polaron shift of excitons in transition metal dichalcogeniedes

J. C. G. Henriques, N. M. R. Peres

摘要:

本文研究了二维过渡金属二硫属化物中声子对基吸收跃迁线1 s激子共振位置的影响。我们应用我们的理论WS $_{2}$的二维材料的吸收峰位置的位移已被测量为温度的函数。该理论仅由两个部分组成:一是纵向光学声子对吸收峰位置的影响,我们用二阶微扰理论描述;二是声子对单粒子能隙值的影响,我们用HuangRhys模型描述。我们的结果表明,一个很好的协议与实验测量的吸收峰随温度的变化。

英文摘要:

In this paper we study the phonon's effect on the position of the 1s excitonic resonance of the fundamental absorption transition line in two-dimensional transition metal dichalcogenides. We apply our theory to WS$_{2}$a two-dimensional material where the shift in absorption peak position has been measured as a function of temperature. The theory is composed of two ingredients only: i) the effect of longitudinal optical phonons on the absorption peak position, which we describe with second order perturbation theory; ii) the effect of phonons on the value of the single particle energy gap, which we describe with the Huang Rhys model. Our results show an excellent agreement with the experimentally measured shift of the absorption peak with the temperature.

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