中国物理B ›› 2001, Vol. 10 ›› Issue (6): 537-540.doi: 10.1088/1009-1963/10/6/314

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AN EFFECTIVE TWO-LEVEL CHANNEL FOR AN IMPURITY IN A SUPERLATTICE

张平1, 段素青1, 赵宪庚1, 张爱珍2, 梁九卿2   

  1. (1)Institute of Applied Physics and Computational Mathematics, Beijing 100088, China; (2)Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China; Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2000-12-15 出版日期:2001-06-15 发布日期:2005-06-12
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 19725417), by National "Climb" Program of China (Grant No. 95-YU-41), and by a Grant of the China Academy of Engineering and Physics.

AN EFFECTIVE TWO-LEVEL CHANNEL FOR AN IMPURITY IN A SUPERLATTICE

Zhang Ai-zhen (张爱珍)ab, Zhang Ping (张平)c, Duan Su-qing (段素青)c, Zhao Xian-geng (赵宪庚)c, Liang Jiu-qing (梁九卿)ab   

  1. a Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China; b Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;  c  Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
  • Received:2000-12-15 Online:2001-06-15 Published:2005-06-12
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 19725417), by National "Climb" Program of China (Grant No. 95-YU-41), and by a Grant of the China Academy of Engineering and Physics.

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摘要： The eigenstates and eigenspectrum of a charged particle in a one-dimensional semiconductor superlattice with an impurity under the action of a dc electric field are investigated employing the single-band tight-binding model. We find that the system undergoes a series of avoided crossings, at which resonant oscillations between the impurity and its nearest neighbour occur if appropriate conditions are met, suggesting an effective two-level approximation. This phenomenon shows that introducing an impurity in a perfect lattice provides a promising structure for the observation of terahertz radiation.

Abstract: The eigenstates and eigenspectrum of a charged particle in a one-dimensional semiconductor superlattice with an impurity under the action of a dc electric field are investigated employing the single-band tight-binding model. We find that the system undergoes a series of avoided crossings, at which resonant oscillations between the impurity and its nearest neighbour occur if appropriate conditions are met, suggesting an effective two-level approximation. This phenomenon shows that introducing an impurity in a perfect lattice provides a promising structure for the observation of terahertz radiation.

Key words: localization, avoided crossing

中图分类号:  (Superlattices)

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03.65.Ge (Solutions of wave equations: bound states)