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Coherence destruction of tunneling in a quantum-dot molecule with bias |
| Zhong Guang-Hui(钟光辉)a) and Wang Li-Min(王立民)b)†ger |
| a Department of Physics, Hebei Normal University, Shijiazhuang 050016, China; b Institute of Applied Physics and Computational Mathematics, Beijing 100088, China |
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Abstract This paper studies the constraint conditions for coherence destruction in tunneling by using perturbation theory and numerical simulation for an AC-field with bias and Coulomb interaction between electrons in a quantum dot molecule. Such conditions can be described by using the roots of a Bessel function Jn(x), where n is determined by both the bias and the Coulomb interactions, and x is the ratio of the amplitude to the frequency of the AC-field. Under such conditions, a coherent suppression of tunneling occurs between localized electronic states, which results from the dynamical localization phenomenon. All the conditions are verified with numerical simulations.
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Received: 01 February 2010
Revised: 19 March 2010
Accepted manuscript online:
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PACS:
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71.15.-m
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(Methods of electronic structure calculations)
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73.20.Jc
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(Delocalization processes)
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73.21.La
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(Quantum dots)
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73.40.Gk
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(Tunneling)
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73.63.Kv
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(Quantum dots)
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| Fund: Project supported by Natural Science Foundation of Hebei Normal University for Young Teachers (Grant No. L2009Q07). |
Cite this article:
Zhong Guang-Hui(钟光辉) and Wang Li-Min(王立民) Coherence destruction of tunneling in a quantum-dot molecule with bias 2010 Chin. Phys. B 19 107202
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