Cooperative Effects in the Photoluminescence of (In,Ga)As/GaAs Quantum Dot Chain Structures.
Multilayer In0.4Ga0.6As/GaAs quantum dot (QD) chain samples are investigated by means of cw and time-resolved photoluminescence (PL) spectroscopy in order to study the peculiarities of interdot coupling in such nanostructures. The temperature dependence of the PL has revealed details of the confinement. Non-thermal carrier distribution through in-chain, interdot wave function coupling is found. The peculiar dependences of the PL decay time on the excitation and detection energies are ascribed to the electronic interdot coupling and the long-range coupling through the radiation field. It is shown that the dependence of the PL decay time on the excitation wavelength is a result of the superradiance effect.
Mazur
Yu I
YI
Department of Physics, University of Arkansas, 226 Physics Building, Fayetteville, AR, 72701, USA. ymazur@uark.edu.
Dorogan
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Marega
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Cesar
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Lopez-Richard
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Marques
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Zhuchenko
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Tarasov
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Salamo
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