Dark states and Aharonov–Bohm oscillations in multi-quantum-dot systems

doi:10.1088/1674-1056/20/2/020303

Abstract We study the formation of dark states and the Aharonov–Bohm effect in symmetrically/asymmetrically coupled three- and four-quantum-dot systems. It is found that without a transverse magnetic field, destructive interference can trap an electron in a dark state. However, the introduction of a transverse magnetic field can disrupt the dark state, giving rise to oscillation in current. For symmetrically structured quantum-dot systems, the oscillation has a period of one flux quanta. But for asymmetrically structured dot systems, the period of oscillation is halved. In addition, the dephasing due to charge noise also blocks the formation of dark states, while it does not change the period of oscillation.

Keywords: quantum dot dark state Aharonov–Bohm effect

Received: 12 June 2010
Revised: 08 October 2010
Accepted manuscript online:

PACS:	03.65.Ta	(Foundations of quantum mechanics; measurement theory)
	73.23.Hk	(Coulomb blockade; single-electron tunneling)
	73.63.Kv	(Quantum dots)
	85.35.Ds	(Quantum interference devices)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2007CB925204), the National Natural Science Foundation of China (Grant No. 10775048), the Key Project of the Chinese Ministry of Education (Grant No. 206103), and the Construct Program of the National Key Discipline.

Cite this article:

Wang Qiong(王琼), Liu Jun(刘军), Tang Ning(唐宁) and Zeng Hao-Sheng(曾浩生) Dark states and Aharonov–Bohm oscillations in multi-quantum-dot systems 2011 Chin. Phys. B 20 020303

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Dark states and Aharonov–Bohm oscillations in multi-quantum-dot systems

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