Abstract
Dynamical behaviors of an exciton in an asymmetric double coupled quantum dot and an alternatingcurrent (ac) electric field have been analyzed based on the two-level approximation theory, and the conditions under which dynamical localization occurs are obtained. It shows that when the amplitude of the ac electric field is small, the Coulomb interaction plays an important role. The dynamical behaviors of the exciton are mainly confined in the low-level subspace. When the ratio of the field intensity to frequency is the root of Bessel function, electron and hole are localized in one dot, and they can be divided with the increasing amplitude of the ac electric field.
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References
Grfonic M. and Hänggi P., Driven quantum tunneling, Phys.Rep., 1998, 304: 229
Grossmann F., Dittrich T., Jung P. et al., Coherent destruction oftunneling, Phys. Rev. Lett., 1991, 67: 516
Zhang P. and Zhao X.-G., Quantum dynamics of a driven double quantum dot, Phys. Lett., A, 2000, 271: 419
Zhang P. and Zhao X.-G., Localization and entanglement of two interacting electrons in a double quantum dot, Phys.Condens. Matter, 2001, 13: 8389
Zhang P. and Zhao X.-G., The floquet spectrum and dynamical localization of a two electron system driven by an alternatingcurrent field, Phys. Condens. Matter, 2000, 12: 2351
Liu C., Ma B. and Wang L., Dynamical localization of an exciton in double quantum dot molecule, Chin. J. Semicond., 2003, 24(7): 707 (in Chinese)
Liu C., Ma B. and Wang L., Dynamic behaviours of an exciton confined in coupled quantum dots driven by an alternating current electrical field, Acta Phys. Sin., 2003, 52: 2020 (in Chinese)
Liu Y. and Chen H., Localization and entanglement of an exciton in a quantum dot molecule by an ac electric field, Phys.Lett., A, 2004, 1: 1
Liu Y. and Chen H., Dynamical localization in an asymmetric two-electron quantum dot molecule by an alternating-current electric field, Chin. Phys. Lett., 2004, 21: 923
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Translated from Chinese Journal of Semiconductors, 2005, 26(6) (in Chinese)
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Liu, Cd., Liu, W., Li, Fl. et al. Dynamical behaviors of an exciton in an asymmetric double coupled quantum dot. Front. Phys. China 1, 238–242 (2006). https://doi.org/10.1007/s11467-006-0007-y
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DOI: https://doi.org/10.1007/s11467-006-0007-y