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Nonuniform carrier density inCd3As2evidenced by optical spectroscopy
Physical Review B ( IF 3.7 ) Pub Date : 2018-03-22 00:00:00 , DOI: 10.1103/physrevb.97.125204
I. Crassee , E. Martino , C. C. Homes , O. Caha , J. Novák , P. Tückmantel , M. Hakl , A. Nateprov , E. Arushanov , Q. D. Gibson , R. J. Cava , S. M. Koohpayeh , K. E. Arpino , T. M. McQueen , M. Orlita , Ana Akrap

We report the detailed optical properties of Cd3As2 crystals in a wide parameter space: temperature, magnetic field, carrier concentration, and crystal orientation. We investigate high-quality crystals synthesized by three different techniques. In all the studied samples, independently of how they were prepared and how they were treated before the optical experiments, our data indicate conspicuous fluctuations in the carrier density (up to 30%). These charge puddles have a characteristic scale of 100 μm, they become more pronounced at low temperatures, and possibly, they become enhanced by the presence of crystal twinning. The Drude response is characterized by very small scattering rates (1 meV) for as-grown samples. Mechanical treatment, such as cutting or polishing, influences the optical properties of single crystals, by increasing the Drude scattering rate and also modifying the high-frequency optical response. Magnetoreflectivity and Kerr rotation are consistent with electronlike charge carriers and a spatially nonuniform carrier density.

中文翻译:

光谱法证明Cd3As2中载流子密度不均匀

我们报告了详细的光学特性 光盘3作为2个宽参数空间中的晶体:温度,磁场,载流子浓度和晶体取向。我们研究了通过三种不同技术合成的高质量晶体。在所有研究的样品中,无论它们是如何制备的以及在光学实验之前如何进行处理的,我们的数据均表明载流子密度存在明显的波动(高达30%)。这些电荷坑的特征刻度为100μ,它们在低温下变得更明显,并且可能由于晶体孪晶的存在而增强。德鲁德响应的特征是散射速率非常小(1个meV)用于生长中的样品。机械加工(例如切割或抛光)会通过提高Drude散射速率并修改高频光学响应来影响单晶的光学特性。磁折率和克尔旋转与类电子电荷载流子和空间上不均匀的载流子密度一致。
更新日期:2018-03-22
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