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Temperature dependence of the dielectric function and of the parameters of critical point transitions of CdTe

机译：CdTe的介电函数和临界点跃迁参数的温度依赖性

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摘要

The dielectric function ε of CdTe is deduced from spectroscopic ellipsometry measurements performed from 0.7 to 5.5 eV. For the first time s is given for temperatures increasing from 20 to 370 K. e variations with photon energy are analysed within the standard critical point model (SCP). The variations, with temperature, of the CP parameters are given, discussed and compared with known data. For T < 80 K the dielectric response is completely governed by the exciton near the fundamental gap Eo The contribution of this bound state decreases with T but remains high at room temperature. The transition at El is likely to correspond to a quasi bound state interacting with the continuum in the entire temperature range studied. Only one critical point is seen in the vicinity of E2 which behaves like a two dimensional transition at a saddle point. The weak variations of the spin--orbit splittings △o and △l with temperature are explained as resulting from the choice of lineshapes used to fit experimental data.
机译：CdTe的介电函数ε是从0.7到5.5 eV的椭圆偏振光谱测量得出的。首次针对温度从20 K升高到370 K给出s。在标准临界点模型（SCP）中分析了光子能量的变化。给出，讨论了CP参数随温度的变化，并与已知数据进行了比较。当T <80 K时，介电响应完全由激元控制，接近于基隙Eo。该束缚态的贡献随着T的增加而降低，但在室温下仍然很高。在整个研究温度范围内，E1处的跃迁可能对应于与连续体相互作用的准结合态。在E2附近仅看到一个临界点，其行为类似于鞍点处的二维过渡。自旋轨道分裂△o和△l随温度的微弱变化被解释为是由于选择了适合实验数据的线形而产生的。

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