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Dynamic behaviours of an exciton confined in coupled quantum dots driven by an a lternating current electrical field

Liu Cheng-Shi Ma Ben-Kun Wang Li-Min

Dynamic behaviours of an exciton confined in coupled quantum dots driven by an a lternating current electrical field

Liu Cheng-Shi, Ma Ben-Kun, Wang Li-Min
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  • Abstract views:  2476
  • PDF Downloads:  630
  • Cited By: 0
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  • Received Date:  29 September 2002
  • Accepted Date:  10 January 2003
  • Published Online:  20 August 2003

Dynamic behaviours of an exciton confined in coupled quantum dots driven by an a lternating current electrical field

  • 1. 北京师范大学物理系,北京 100875

Abstract: With a two-site Hubbard model and Floquet theorem, we investigate the dynamic behaviour of an exciton confined in a coupled double-quantum-dot system driven by an alternating current(AC) electrical field. The calculation shows that the quasi-energy levels versus the amplitude of the external field undergo a series o f exact-crossing and avoid-crossing. Generally, the initially localized state can remain forever at the first exact-crossing point of two ground quasi-energy levels. Increasing the interaction of the electron and hole, the degree of dynamical localization is enhanced. At the second exact-crossing point of ground quasi-energy levels, this kind of dynamical localization is decayed. At the point of avoid-crossing and offset from the exact-crossing, the dynamical localiz ation ceases to maintain. This demonstrates the possibility to control the excit on states on extremely short time scales using the appropriate AC field with the adjustable amplitude and frequency, which may be useful for quantum information processing.

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