中国物理B ›› 2009, Vol. 18 ›› Issue (6): 2523-2528.doi: 10.1088/1674-1056/18/6/067

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Dynamics of electron in a surface quantum well

王立飞, 杨光参   

  1. School of Physics and Electronic Information, Wenzhou University, Wenzhou 325035, China
  • 收稿日期:2008-08-05 修回日期:2008-10-10 出版日期:2009-06-20 发布日期:2009-06-20
  • 基金资助:
    Project partially supported by the State Key Development Program of Basic Research of China (Grant No 2007CB310405).

Dynamics of electron in a surface quantum well

Wang Li-Fei(王立飞) and Yang Guang-Can(杨光参)   

  1. School of Physics and Electronic Information, Wenzhou University, Wenzhou 325035, China
  • Received:2008-08-05 Revised:2008-10-10 Online:2009-06-20 Published:2009-06-20
  • Supported by:
    Project partially supported by the State Key Development Program of Basic Research of China (Grant No 2007CB310405).

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摘要： This paper studies the quantum dynamics of electrons in a surface quantum well in the time domain with autocorrelation of wave packet. The evolution of the wave packet for different manifold eigenstates with finite and infinite lifetimes is investigated analytically. It is found that the quantum coherence and evolution of the surface electronic wave packet can be controlled by the laser central energy and electric field. The results show that the finite lifetime of excited states expedites the dephasing of the coherent electronic wave packet significantly. The correspondence between classical and quantum mechanics is shown explicitly in the system.

Abstract: This paper studies the quantum dynamics of electrons in a surface quantum well in the time domain with autocorrelation of wave packet. The evolution of the wave packet for different manifold eigenstates with finite and infinite lifetimes is investigated analytically. It is found that the quantum coherence and evolution of the surface electronic wave packet can be controlled by the laser central energy and electric field. The results show that the finite lifetime of excited states expedites the dephasing of the coherent electronic wave packet significantly. The correspondence between classical and quantum mechanics is shown explicitly in the system.

Key words: quantum well, electronic wavepacket, autocorrelation function

中图分类号:  (Quantum wells)

  • 73.21.Fg
73.20.At (Surface states, band structure, electron density of states)