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)
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
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.
Received: 18 February 2007
Revised: 27 March 2007
Accepted manuscript online:
(Galvanomagnetic and other magnetotransport effects)
Fund: 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).
Cite this article:
Xie Yue-E(谢月娥), Chen Yuan-Ping(陈元平), and Yan Xiao-Hong(颜晓红) Magnetotransport in a dual waveguide coupled by a finite barrier: Energy filter and directional coupler 2007 Chinese Physics 16 3087
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