Li Jing, Sun Yanmei, Wu Meimei, Pan Hui
Department of Physics, Beihang University, Beijing 100191, People's Republic of China.
J Phys Condens Matter. 2021 Apr 23;33(18). doi: 10.1088/1361-648X/abf19e.
We theoretically study the Landau levels and the magneto-optical conductivity of eight-borophene in the presence of a perpendicular magnetic field and an inplane electric field. We find that in the absence of the inplane electric field, the magneto-optical conductivity of eight-borophene presents a series of striking single resonance peaks as functions of the frequency, and the longitudinal conductivities are found to be anisotropic due to its anisotropic tilted Dirac cones. In the presence of the inplane electric field, some novel effects are predicted on the Landau levels and the magneto-optical conductivity. The Landau level spacings in the two tilted Dirac cones are different, which lifts the degeneracy of the twofold valley, and the magneto-optical conductivity appears a double peak structure. We also discuss the influence of the chemical potential between different Landau levels on the double peak of the magneto-optical response. The valley related magneto-optical properties in the anisotropic structure may make eight-borophene a candidate for the new optical devices.
我们从理论上研究了垂直磁场和面内电场作用下八硼烯的朗道能级和磁光电导率。我们发现，在没有面内电场的情况下，八硼烯的磁光电导率呈现出一系列随频率变化的显著单共振峰，并且由于其各向异性倾斜狄拉克锥，纵向电导率表现出各向异性。在存在面内电场的情况下，预计朗道能级和磁光电导率会出现一些新效应。两个倾斜狄拉克锥中的朗道能级间距不同，这消除了双重谷的简并性，磁光电导率呈现双峰结构。我们还讨论了不同朗道能级之间的化学势对磁光响应双峰的影响。各向异性结构中与谷相关的磁光特性可能使八硼烯成为新型光学器件的候选材料。
