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Diverse magnetic quantization in bilayer silicene

机译：双层硅中的多元化磁量化

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摘要

The generalized tight-binding model is developed to investigate the rich and unique electronic properties of AB-bt (bottom-top) bilayer silicene under uniform perpendicular electric and magnetic fields. The first pair of conduction and valence bands, with an observable energy gap, displays unusual energy dispersions. Each group of conduction/valence Landau levels (LLs) is further classified into four subgroups, i.e., the sublattice-and spin-dominated LL subgroups. The magnetic-field-dependent LL energy spectra exhibit irregular behavior corresponding to the critical points of the band structure. Moreover, the electric field can induce many LL anticrossings. The main features of the LLs are uncovered with many van Hove singularities in the density-of-states and nonuniform delta-function-like peaks in the magnetoabsorption spectra. The feature-rich magnetic quantization directly reflects the geometric symmetries, intralayer and interlayer atomic interactions, spin-orbital couplings, and field effects. The results of this work can be applied to novel designs of Si-based nanoelectronics and nanodevices with enhanced mobilities.
机译：建立了广义的紧束缚模型，以研究在均匀垂直电场和磁场作用下AB-bt（底部）双层硅油的丰富而独特的电子性能。第一对导带和价带具有可观察到的能隙，显示出异常的能量分散。每组传导/价朗道能级（LLs）进一步分为四个亚组，即亚晶格和自旋为主的LL亚组。与磁场有关的LL能谱表现出与能带结构的临界点相对应的不规则行为。而且，电场可以引起许多LL反交叉。 LL的主要特征是在磁吸收光谱中具有许多范霍夫奇异性和密度分布的非均匀三角函数样峰。功能丰富的磁量化直接反映了几何对称性，层内和层间原子相互作用，自旋轨道耦合和场效应。这项工作的结果可以应用于具有更高迁移率的基于硅的纳米电子学和纳米器件的新颖设计。

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  • 来源
    《Physical review》 |2018年第12期|125416.1-125416.11|共11页
  • 作者

    Thi-Nga Do; Po-Hsin Shih; Godfrey Gumbs; Danhong Huang; Chih-Wei Chiu; Ming-Fa Lin;

  • 作者单位

    Department of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan 82446, Republic of China;

    Department of Physics, National Cheng Kung University, Tainan, Taiwan 701, Republic of China;

    Department of Physics and Astronomy, Hunter College of the City University of New York, 695 Park Avenue, New York, New York 10065, USA;

    US Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, USA;

    Department of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan 82446, Republic of China;

    Hierarchical Green-Energy Materials Research Center, National Cheng Kung University, Tainan, Taiwan 701, Republic of China,Quantum Topology Center, National Cheng Kung University, Tainan, Taiwan 701, Republic of China;

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