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arXiv 1610.02012cond-mat.str-elcond-mat.mes-hall
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拓扑绝缘体Bi2Se3中的Fano q反转

Fano q-reversal in topological insulator Bi2Se3

S. V. Dordevic, G. M. Foster, M. S. Wolf, N. Stojilovic, H. Lei, C. Petrovic, Z. Chen, Z. Q. Li, L. C. Tung

摘要:

我们研究了正则拓扑绝缘体Bi $_2$ Se $_3$的磁光响应,目的是解决一个有争议的问题的电子-声子耦合。磁场引起的反射率的修改是非常明显的红外光谱的一部分,表明强烈的电子-声子耦合。这种耦合导致60 cm $^{-1}$声子模式的不对称线形,并在Fano形式主义内进行分析。分析表明,当回旋共振随声子模简并时,Fano非对称性参数q变号。据我们所知,这是磁场驱动q反转的第一个例子。

英文摘要:

We studied magneto-optical response of a canonical topological insulator Bi$_2$Se$_3$ with the goal of addressing a controversial issue of electron-phonon coupling. Magnetic-field induced modifications of reflectance are very pronounced in the infrared part of the spectrum, indicating strong electron-phonon coupling. This coupling causes an asymmetric line-shape of the 60 cm$^{-1}$ phonon mode, and is analyzed within the Fano formalism. The analysis reveals that the Fano asymmetry parameter (q) changes sign when the cyclotron resonance is degenerate with the phonon mode. To the best of our knowledge this is the first example of magnetic field driven q-reversal.

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