中国物理B ›› 2007, Vol. 16 ›› Issue (10): 3087-3092.doi: 10.1088/1009-1963/16/10/044

• • 上一篇    下一篇

Magnetotransport in a dual waveguide coupled by a finite barrier: Energy filter and directional coupler

颜晓红1, 谢月娥2, 陈元平2   

  1. (1)College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; (2)Institute of Modern Physics and Department of Physics, Xiangtan University,Xiangtan 411105, China
  • 收稿日期:2007-02-18 修回日期:2007-03-27 出版日期:2007-10-08 发布日期:2007-10-08
  • 基金资助:
    Project supported by the Project of Hunan Provincial Education Department of China (Grant No 05C103) and the Major Program of Ministry of Education, China (Grant No 204099).

Magnetotransport in a dual waveguide coupled by a finite barrier: Energy filter and directional coupler

Xie Yue-E(谢月娥)a), Chen Yuan-Ping(陈元平)a), and Yan Xiao-Hong(颜晓红)b)   

  1. a Institute of Modern Physics and Department of Physics, Xiangtan University, Xiangtan 411105, China; b College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2007-02-18 Revised:2007-03-27 Online:2007-10-08 Published:2007-10-08
  • Supported by:
    Project supported by the Project of Hunan Provincial Education Department of China (Grant No 05C103) and the Major Program of Ministry of Education, China (Grant No 204099).

PDF (PC)

456

赞

摘要： We propose in this paper that a dual waveguide coupled by a finite barrier be able to serve as an energy filter under a perpendicular magnetic field. In the waveguide direction, the conductance exhibits a periodic square-wave pattern in which the miniband is controlled by the magnetic and potential modulation. The electrons with energies in the miniband can completely transfer along one waveguide while the other electrons undergo filtration. Compared with the coupled waveguide without magnetic modulation, the structure under magnetic field is found to be a good directional coupler. By adjusting the potential barrier and magnetic field, the electrons input from one port of waveguide can transfer to any other ports.

关键词: magnetotransport, dual waveguide

Abstract: We propose in this paper that a dual waveguide coupled by a finite barrier be able to serve as an energy filter under a perpendicular magnetic field. In the waveguide direction, the conductance exhibits a periodic square-wave pattern in which the miniband is controlled by the magnetic and potential modulation. The electrons with energies in the miniband can completely transfer along one waveguide while the other electrons undergo filtration. Compared with the coupled waveguide without magnetic modulation, the structure under magnetic field is found to be a good directional coupler. By adjusting the potential barrier and magnetic field, the electrons input from one port of waveguide can transfer to any other ports.

Key words: magnetotransport, dual waveguide

中图分类号:  (Quantum wires)

  • 73.63.Nm
72.20.My (Galvanomagnetic and other magnetotransport effects)