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Coherent Dynamics of Direct-Current-Driven Quantum-Dot-Array with Two Time-Dependent Embedded Impurities |
| LI Xiu-Ping;LA Shi-Jiang;WEN Yu-Bing;YAN Wei-Xian |
| Department of Physics, Shanxi University, Taiyuan 030006 |
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| Cite this article: |
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LI Xiu-Ping, LA Shi-Jiang, WEN Yu-Bing et al 2008 Chin. Phys. Lett. 25 1396-1399 |
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Abstract The coherent dynamics of dc-driven quantum-dot array with two embedded time-dependent impurities is investigated, the exact crossings and avoided crossings in the quasienergies are associated with the evolution dynamics of the electron by the introduction of the envelope lines of the site's maximum returning probability. Through a perturbative scheme, the time-dependent Hamiltonian is replaced by an equivalent static one, whose structure reveals the new quantum tunnelling mechanism in the time-periodic driving system and sheds light on the alternative interpretation of dynamic localization and delocalization.
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| Keywords:
66.35.+a
72.20.Ee
72.10.Fk
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Received: 18 August 2007
Published: 31 March 2008
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| PACS: |
66.35.+a
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(Quantum tunneling of defects)
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72.20.Ee
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(Mobility edges; hopping transport)
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72.10.Fk
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(Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect))
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