纳米尺度下轻掺杂硒化铅质量增强因子的测定
Nanoscale Determination of the Mass Enhancement Factor in the Lightly-Doped Bulk Insulator Lead Selenide
摘要：
铋硫族化物和碲化铅/硒化铅合金具有优异的热电性能，可用于发电和器件应用。由于声子在实现这些所需特性方面起着重要作用，因此量化声子和电子之间的相互作用（编码在材料的Eliashberg函数中）非常重要。然而，由于缺乏当地的实验探测器，其精确提取在一定程度上受到限制。在这里，我们构建了一种方法，直接提取的Eliashberg功能使用朗道能级光谱，并证明其适用于轻掺杂的热电体绝缘体PbSe。除了它的高能量分辨率仅限于热展宽，这种新的实验方法可以用来检测在纳米尺度上的质量增强因子的变化。因此，它开辟了一个新的途径，研究化学缺陷，表面掺杂和应变的质量增强因子的影响。
英文摘要：
Bismuth chalcogenides and lead telluride/selenide alloys exhibit exceptional thermoelectric properties which could be harnessed for power generation and device applications. Since phonons play a significant role in achieving these desired properties, quantifying the interaction between phonons and electrons, which is encoded in the Eliashberg function of a material, is of immense importance. However, its precise extraction has in part been limited due to the lack of local experimental probes. Here we construct a method to directly extract the Eliashberg function using Landau level spectroscopy, and demonstrate its applicability to lightly-doped thermoelectric bulk insulator PbSe. In addition to its high energy resolution only limited by thermal broadening, this novel experimental method could be used to detect variations in mass enhancement factor at the nanoscale. As such, it opens up a new pathway for investigating the effects of chemical defects, surface doping and strain on the mass enhancement factor.
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