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arXiv 1907.06339cond-mat.mes-hall
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BiTeI中Rashba模型的有效性极限:高场磁光研究

Limits of Validity of Rashba Model in BiTeI: A High-field Magneto-optical Study

S. Bordacs, M. Orlita, M. Sikula, H. Murakawa, Y. Tokura

摘要:

最近的研究表明,BiTeI,一种具有极性晶体结构的半导体,具有巨大的电子自旋分裂,这已被解释为Rashba型自旋轨道耦合。在这里,我们使用高场磁光光谱来量化的导带轮廓的偏差,从这个吸引人的,但在同一时间,强烈简化的模型。我们发现,光学响应-包括一系列的朗道能级间的激发-可以描述的Rashba模型,只有在低磁场。相比之下,高场响应似乎更符合一个简单的图片无质量的电子在一个圆锥带。这表明,在导带底部以上的能量处,更倾向于线性而不是抛物线。

英文摘要:

It was recently shown that BiTeI, a semiconductor with polar crystal structure, possesses a giant spin-splitting of electrons, which has been interpreted in terms of Rashba-type spin-orbit coupling. Here, we use high field magneto-optical spectroscopy to quantify the deviations of the conduction-band profile from this appealing, but at the same time, strongly simplifying model. We find that the optical response -- comprising a series of inter-Landau level excitations -- can be described by the Rashba model only at low magnetic fields. In contrast, the high-field response appears to be more consistent with a simple picture of massless electrons in a conical band. This points towards more linear rather than parabolic at energies well above the bottom of the conduction band.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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