Wu Jhao-Ying, Su Wu-Pei, Gumbs Godfrey
Center of General Studies, National Kaohsiung University of Science and Technology, Kaohsiung, 811, Taiwan.
Department of Physics, University of Houston, Houston, Texas, USA.
Sci Rep. 2020 May 6;10(1):7674. doi: 10.1038/s41598-020-64106-0.
The magneto-transport properties of phosphorene are investigated by employing the generalized tight-binding model to calculate the energy bands. For bilayer phosphorene, a composite magnetic and electric field is shown to induce a feature-rich Landau level (LL) spectrum which includes two subgroups of low-lying LLs. The two subgroups possess distinct features in level spacings, quantum numbers, as well as field dependencies. These together lead to anomalous quantum Hall (QH) conductivities which include a well-shape, staircase and composite quantum structures with steps having varying heights and widths. The Fermi energy-magnetic field-Hall conductivity (E-B-σ) and Fermi energy-electric field-Hall conductivity (E-E-σ) phase diagrams clearly exhibit oscillatory behaviors and cross-over from integer to half-integer QH effect. The predicted results should be verifiable by magneto-transport measurements in a dual-gated system.
通过采用广义紧束缚模型计算能带，研究了磷烯的磁输运性质。对于双层磷烯，复合磁场和电场被证明会诱导出丰富的朗道能级（LL）光谱，其中包括两个低能朗道能级子群。这两个子群在能级间距、量子数以及场依赖性方面具有不同的特征。这些共同导致了异常量子霍尔（QH）电导率，包括形状良好的、阶梯状的以及具有不同高度和宽度台阶的复合量子结构。费米能量 - 磁场 - 霍尔电导率（E - B - σ）和费米能量 - 电场 - 霍尔电导率（E - E - σ）相图清楚地展示了振荡行为以及从整数到半整数量子霍尔效应的转变。预测结果应该可以通过双栅系统中的磁输运测量来验证。
