Cyclotron resonance in Kondo insulator
Cyclotron resonance in Kondo insulator
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DOI：
10.1103/physrevresearch.2.023194
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发表时间：
2020-05-19
影响因子：
4.2
通讯作者：
Tada, Yasuhiro
中科院分区：
文献类型：
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作者：
Tada, Yasuhiro
受近藤绝缘体SmB_6和YbB_（12）中量子振荡实验观测的启发，我们研究了近藤绝缘体的磁光电导。我们发现，由于系统的特征朗道能级结构，在低于杂化能隙的频域中存在非平凡的回旋共振峰。此外，这些低能量峰在由施加的磁场驱动的绝缘体-金属相变附近增强，并且即使在低温下也是稳定的。它们通过近藤效应平滑地连接到高温下未杂化传导和f电子的共振峰。非平凡的回旋共振是静态量子振荡的动力学对应物，通过这种密切的联系，它将为后者提供有用的见解。
Motivated by the recent experimental observations of quantum oscillations in the Kondo insulators SmB6 and YbB12, we study magneto-optical conductivity of Kondo insulators. We show that there exist nontrivial cyclotron resonance peaks in a frequency domain below the hybridization gap as a result of the characteristic Landau level structure of the system. Furthermore, these low-energy peaks are enhanced near the insulator-metal phase transition driven by an applied magnetic field and stable even at low temperatures. They are smoothly connected via the Kondo effect to resonance peaks for unhybridized conduction and f electrons at high temperature. The nontrivial cyclotron resonance is a dynamical counterpart of quantum oscillations in static quantities, and through this intimate connection it will provide a useful insight for the latter.