Coherent spectroscopy of a strongly driven triple quantum dot molecule

doi:10.1088/1674-1056/19/11/117302

Abstract Based on a calculation model, we study the interference phenomena of serially coupled V-type and Λ-type triple quantum dots (CTQDs) driven simultaneously by a strong driving field and a weak probe field. Strongly depending on the configuration of the three-level CTQD, the probe absorption spectra, which are shown in the tunneling current, exhibit various quantum coherence properties. In the case where the two pairs of transitions of the CTQD have a small eigenfrequency difference Δω, the double-coupling effect of the driving field results in two Autler-Townes doublets and one weak Mollow triplet in one spectrum. With the value of Δω increasing, only one Autler-Townes splitting remains due to the single-coupling of the field. We also find that the effect of spontaneous emission of phonons may lead to an obvious background current, which can be used to distinguish which transition is driven by the driving field in experiment. The interesting quantum property of a CTQD revealed in our results suggests its potential applications in quantum modulators and quantum logic devices.

Keywords: coherent spectroscopy coupled quantum dots quantum transport photon assistance

Received: 08 April 2010
Revised: 17 June 2010
Accepted manuscript online:

PACS:	73.23.-b	(Electronic transport in mesoscopic systems)
	73.40.Gk	(Tunneling)
	73.63.Kv	(Quantum dots)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10774016).

Cite this article:

Xie Yan(解研), Duan Su-Qing(段素青), Chu Wei-Dong(楚卫东), and Yang Ning(杨宁) Coherent spectroscopy of a strongly driven triple quantum dot molecule 2010 Chin. Phys. B 19 117302

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