双层硅烯的几何和场多样性电子和光学性质
Geometry- and field-diversified electronic and optical properties in bilayer silicene
摘要：
本文发展了广义紧束缚模型，对AB-bt双层硅烯的电子和光学性质进行了深入的研究。它们通过屈曲结构、堆叠配置、层内和层间跳跃积分、自旋轨道耦合、电场和磁场（${E_z\hat z}$ $\&$ ${B_z\hat z}$）而极大地多样化。随着$E_z$的变化，存在线性、抛物线和等能量环色散，多谷能带结构和超导金属跃迁。与$E_z$相关的磁量子化表现出丰富而独特的朗道能级和磁光谱。LLS具有较低的简并度、谷产生的局域中心、不寻常的量子数分布、在$B_z$依赖性中表现良好和异常的能谱以及不存在反交叉行为。在很窄的频率范围内出现了许多明显的磁吸收峰，这归因于不同的激发类别。除了临界电场驱动狄喇克锥能带结构外，它们没有特定的选择规则。光学带隙被$E_z$减小，但被$B_z$增强，其中阈值通道可能在形成的情况下显著改变。上述特性与层状石墨烯形成鲜明对比。
英文摘要：
The generalized tight-binding model has been developed to thoroughly explore the essential electronic and optical properties of AB-bt bilayer silicene. They are greatly diversified by the buckled structure, stacking configuration, intralayer and interlayer hopping integrals, spin-orbital couplings; electric and magnetic fields (${E_z\hat z}$ $\&$ ${B_z\hat z}$). There exist the linear, parabolic and constant-energy-loop dispersions, multi-valley band structure and semiconductor-metal transition as $E_z$ varies. The $E_z$-dependent magnetic quantization exhibits the rich and unique Landau Levels (LLs) and magneto-optical spectra. The LLs have the lower degeneracy, valley-created localization centers, unusual distributions of quantum numbers, well-behaved and abnormal energy spectra in $B_z$-dependences, and the absence of anti-crossing behavior. A lot of pronounced magneto-absorption peaks occur at a very narrow frequency range, being attributed to diverse excitation categories. They have no specific selection rules except that the Dirac-cone band structures are driven by the critical electric fields. The optical gaps are reduced by $E_z$, but enhanced by $B_z$, in which the threshold channel might dramatically change in the formed case. The above-mentioned characteristics are in sharp contrast with those of layered graphenes.
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