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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 (Engelska)Ingår i: Journal of the Physical Society of Japan, ISSN 0031-9015, E-ISSN 1347-4073, Vol. 87, nr 4, artikel-id 044401Artikel i tidskrift (Refereegranskat) 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.

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Physical society of Japan, 2018. Vol. 87, nr 4, artikel-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

Tillgänglig från: 2018-05-16 Skapad: 2018-05-16 Senast uppdaterad: 2018-05-22Bibliografiskt granskad

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