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Transient evolutional dynamics of quantum-dot molecular phase coherence for sensitive optical switching
KTH. Joint Research Centre of Photonics of Zhejiang University.
2018 (engelsk)Inngår i: Journal of the Physical Society of Japan, ISSN 0031-9015, E-ISSN 1347-4073, Vol. 87, nr 4, artikkel-id 044401Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Atomic phase coherence (quantum interference) in a multilevel atomic gas exhibits a number of interesting phenomena. Such an atomic quantum coherence effect can be generalized to a quantum-dot molecular dielectric. Two quantum dots form a quantum-dot molecule, which can be described by a three-level Λ-configuration model fj0i; j1i; j2ig, i.e., the ground state of the molecule is the lower level ∣0〉 and the highly degenerate electronic states in the two quantum dots are the two upper levels j1i; j2i. The electromagnetic characteristics due to the ∣0〉–∣1〉 transition can be controllably manipulated by a tunable gate voltage (control field) that drives the ∣2〉–∣1〉 transition. When the gate voltage is switched on, the quantum-dot molecular state can evolve from one steady state (i.e., ∣0〉–∣1〉 two-level dressed state) to another steady state (i.e., three-level coherent-population-trapping state). In this process, the electromagnetic characteristics of a quantum-dot molecular dielectric, which is modified by the gate voltage, will also evolve. In this study, the transient evolutional behavior of the susceptibility of a quantum-dot molecular thin film and its reflection spectrum are treated by using the density matrix formulation of the multilevel systems. The present field-tunable and frequency-sensitive electromagnetic characteristics of a quantum-dot molecular thin film, which are sensitive to the applied gate voltage, can be utilized to design optical switching devices.

sted, utgiver, år, opplag, sider
Physical society of Japan, 2018. Vol. 87, nr 4, artikkel-id 044401
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URN: urn:nbn:se:kth:diva-227470DOI: 10.7566/JPSJ.87.044401ISI: 000429108000018Scopus ID: 2-s2.0-85043700822OAI: oai:DiVA.org:kth-227470DiVA, id: diva2:1206249
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 QC 20180516

Tilgjengelig fra: 2018-05-16 Laget: 2018-05-16 Sist oppdatert: 2018-05-22bibliografisk kontrollert

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