One-dimensional features of In(Ga)As/GaAs dot chain structures with changeable interdot coupling

Mazur, Yu. I.; Dorogan, V. G.; Marega, E.; Lytvyn, P. M.; Zhuchenko, Z. Ya.; Tarasov, G. G.; Salamo, G. J.

doi:10.1088/1367-2630/11/4/043022

Cited by 14 publications

(11 citation statements)

References 26 publications

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“…[14][15][16] These (In, Ga)As/GaAs quantum dot-chain structures consist of elongated QDs aligned along the chain direction. The distances between neighboring QDs and their sizes are easily controlled by growth conditions, such that at very large dot to dot separations the ensemble acts like a collection of separate 0D QDs, and at very small separations where the dots are nearly touching, it acts more like a collection of coherent 1D nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Effect of dimensionality and morphology on polarized photoluminescence in quantum dot-chain structures

Mazur

Dorogan

Ware

et al. 2012

Journal of Applied Physics

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Change of the photoluminescence (PL) polarization is studied by changing the excitation intensity and temperature for aligned In(Ga)As quantum dot (QD) structures with varying inter-dot distances grown by molecular beam epitaxy on semi-insulating GaAs (100) substrates. An unusual increase of the polarization ratio is observed by increasing the temperature and/or excitation intensity throughout a low temperature (T < 70 K) and low intensity (Iex < 1 W/cm2) range. This increase as well as the general behavior of the polarized PL are the results of the exciton dynamics and the peculiarities of the system morphology. They are due to the varying inter-dot distances which change the system from zero-dimensional comprised of isolated QDs to one-dimensional comprised of wire-like structures.

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Section: Introductionmentioning

confidence: 99%

Effect of dimensionality and morphology on polarized photoluminescence in quantum dot-chain structures

Mazur

Dorogan

Ware

et al. 2012

Journal of Applied Physics

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“…In Ref. 18, a discussion can be found about the potential effect of inter-dot coupling in the experimentally extracted decay time of coupled QDs. Also in this case various samples were tested with different In content that would, in principle lead to variations of the electronic structure, however it has been shown that the main effect that shapes the relaxation and recombination process is the inter-dot electronic coupling tuned by inter-dot distance.…”

Section: Ref 6)mentioning

confidence: 99%

Carrier transfer in the optical recombination of quantum dots

et al. 2011

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We report a study of dynamic effects detected in the time-resolved emission from quantum dot ensembles. Experimental procedures were developed to search for common behaviors found in quantum dot systems independently of their composition: three quantum dot samples were experimentally characterized. Systems with contrasting inter-dot coupling are compared and their sensitivity to the excitation energy is analyzed. Our experimental results are compared and contrasted with other results available in literature. The optical recombination time dependence on system parameters is derived and compared to the experimental findings. We discuss the effects of occupation of the ground state in both valence and conduction bands of semiconductor quantum dots in the dynamics of the system relaxation as well as the non-linear effects.

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“…Moreover, another interesting topic emerged related to ordering of QDs in various kinds of arrays, such as in chains of QDs. QD chains create a bridge from zero-to onedimensional nanostructures and show interesting optical [17][18][19] and transport behaviors [20]. Previously, we could show that InAs QD chains grown onto groove-like patterns show different growing behaviors than their selfassembled counterparts, and thus their optical properties show differences [21].…”

Section: Introductionmentioning

confidence: 99%

The Role of Groove Periodicity in the Formation of Site-Controlled Quantum Dot Chains

Schramm¹,

Hakkarainen²,

Tommila³

et al. 2016

Nano Online

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Structural and optical properties of InAs quantum dot (QD) chains formed in etched GaAs grooves having different periods from 200 to 2000 nm in [010] orientation are reported. The site-controlled QDs were fabricated by molecular beam epitaxy on soft UV-nanoimprint lithography-patterned GaAs(001) surfaces. Increasing the groove periods decreases the overall QD density but increases the QD size and the linear density along the groove direction. The effect of the increased QD size with larger periods is reflected in ensemble photoluminescence measurements as redshift of the QD emission. Furthermore, we demonstrate the photoluminescence emission from single QD chains.

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One-dimensional features of In(Ga)As/GaAs dot chain structures with changeable interdot coupling

Cited by 14 publications

References 26 publications

Effect of dimensionality and morphology on polarized photoluminescence in quantum dot-chain structures

Effect of dimensionality and morphology on polarized photoluminescence in quantum dot-chain structures

Carrier transfer in the optical recombination of quantum dots

The Role of Groove Periodicity in the Formation of Site-Controlled Quantum Dot Chains

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