Dirac-Weyl 半金属结中电磁控制的克莱因隧穿和电荷电导
The Electric and Magnetic-Controlled Klein Tunneling and Charge Conductance in Dirac-Weyl Semimetal Junction
投稿时间:2018-10-28  修订日期:2018-10-28
DOI:
中文关键词: Dirac-Weyl半金属  克莱因隧穿  电势垒  磁场  电荷电导
英文关键词: Dirac-Weyl semimetal  Klein tunneling  electric potential barrier  magnetic field  charge conductance
基金项目:国家自然科学基金(11404411)
作者单位E-mail
邱学军 中南民族大学 电子信息工程学院 2014006@mail.scuec.edu.cn 
吕强 中南民族大学 电子信息工程学院  
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中文摘要:
      本文理论研究了Dirac-Weyl 半金属结中电磁控制的克莱因隧穿和电荷电导。研究发现,完美电子隧穿显著依赖于电势垒的大小、磁场幅度及其方向。当电势垒接近费米能时,该结构显示了明显的波矢过滤特性。有趣的是,通过调节磁场幅度和方向,可以获得任意入射角度的完美隧穿电子波矢。基于电子的透射概率,进一步计算了电势垒和磁场幅度对电荷电导的影响,研究发现,通过选择合适的电势垒或磁场幅度,可以实现电子开关的功能。最后,讨论了不同磁场作用下电势垒依赖的电荷电导,由于电子的倏逝波模式隧穿,电荷电导展示了一个磁场依赖的输运空隙,且空隙宽度随磁场增大而增大。这些理论结果为设计基于Dirac-Weyl半金属结中纳米电子器件提供了基础。
英文摘要:
      In this paper, we theoretically study electric and magnetic-controlled Klein tunneling and charge conductance in Dirac-Weyl semimetal junction. It is found that the perfect electron tunneling is sensitive to the electric potential barrier, magnetic field magnitude and its direction. The structure shows obvious wave vector filtering behavior when the potential barrier is close to Fermi energy. More interesting, under the modulation of magnetic field magnitude and direction, a perfect electron tunneling wave vector of discretionary incident angle can be obtained. Based on the transmission probability, we further calculate the charge conductance under the effect of electric potential barrier and magnetic field, one electric switch is found to be feasible by choosing appropriate electric potential barrier and magnetic field. Finally, we discuss the electric potential barrier-dependent charge conductance at different magnetic field, owing to these evanescent modes, a magnetic field -dependent transport gap is observed and increases as the magnetic field. These theoretical results provide basics for designing nano-electronic devices based on Dirac-Weyl semimetal junction.
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