Coherence destruction of tunneling in a quantum-dot molecule with bias

doi:10.1088/1674-1056/19/10/107202

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 J_n(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.

Keywords: dynamic localization Floquet state constraint conditions

Received: 01 February 2010
Revised: 19 March 2010
Accepted manuscript online:

PACS:	71.15.-m	(Methods of electronic structure calculations)
	73.20.Jc	(Delocalization processes)
	73.21.La	(Quantum dots)
	73.40.Gk	(Tunneling)
	73.63.Kv	(Quantum dots)

Fund: Project supported by Natural Science Foundation of Hebei Normal University for Young Teachers (Grant No. L2009Q07).

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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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