Magnetophotoluminescence study of intershell exchange interaction in CdTe/ZnTe quantum dots

Kazimierczuk, T.; Smoleński, T.; Goryca, M.; Kłopotowski, Ł.; Wojnar, P.; Fronc, K.; Golnik, A.; Nawrocki, M.; Gaj, J. A.; Kossacki, P.

doi:10.1103/physrevb.84.165319

Cited by 40 publications

(60 citation statements)

References 32 publications

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“…28 However, in accordance with Ref. 25 and 27 we find that for telluride QDs the distances between the emission lines vary almost proportionally to each other ( Fig. 1(c)).…”

Section: Resultssupporting

confidence: 90%

Comparison of magneto-optical properties of various excitonic complexes in CdTe and CdSe self-assembled quantum dots

Kobak

Smoleński

Goryca

et al. 2016

J. Phys.: Condens. Matter

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We present a comparative study of two self-assembled quantum dot (QD) systems based on II-VI compounds: CdTe/ZnTe and CdSe/ZnSe. Using magneto-optical techniques we investigated a large population of individual QDs. The systematic photoluminescence studies of emission lines related to the recombination of neutral exciton X, biexciton XX, and singly charged excitons (X + , X − ) allowed us to determine average parameters describing CdTe QDs (CdSe QDs): X-XX transition energy difference 12 meV (24 meV); fine-structure splitting δ1 = 0.14 meV (δ1 = 0.47 meV); g-factor g = 2.12 (g = 1.71); diamagnetic shift γ = 2.5 µeV/T 2 (γ = 1.3 µeV/T 2 ). We find also statistically significant correlations between various parameters describing internal structure of excitonic complexes.

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“…28 However, in accordance with Ref. 25 and 27 we find that for telluride QDs the distances between the emission lines vary almost proportionally to each other ( Fig. 1(c)).…”

Section: Resultssupporting

confidence: 90%

Comparison of magneto-optical properties of various excitonic complexes in CdTe and CdSe self-assembled quantum dots

Kobak

Smoleński

Goryca

et al. 2016

J. Phys.: Condens. Matter

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“…Such an emission is not observed in PL measurements performed in a typical experimental setup with optical axis parallel to the QD growth axis 10,18,19 . However, the dark exciton PL can be revealed by using an in-plane setup geometry (i.e., the optical axis perpendicular to the growth axis).…”

mentioning

confidence: 86%

“…Under strong excitation power (short dot repopulation time) the bright exciton PL dominates the spectrum, as X b lifetime is usually much shorter compared to the dark exciton one. However, in the low excitation power regime (i.e., when the dot repopulation time is long enough to allow undisturbed recombination of the X d ), the dark exciton emission line is clearly visible (its identification is based on the spectral position, which matches relative energy of the dark exciton determined in the magnetophotoluminescence experiments 18 ). This result indicates the presence of radiative recombination channel of the dark exciton confined inside a QD.…”

mentioning

confidence: 99%

In-plane radiative recombination channel of a dark exciton in self-assembled quantum dots

et al. 2012

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We demonstrate evidence for a radiative recombination channel of dark excitons in self-assembled quantum dots. This channel is due to a light hole admixture in the excitonic ground state. Its presence was experimentally confirmed by a direct observation of the dark exciton photoluminescence from a cleaved edge of the sample. The polarization resolved measurements revealed that a photon created from the dark exciton recombination is emitted only in the direction perpendicular to the growth axis. Strong correlation between the dark exciton lifetime and the in-plane hole g-factor enabled us to show that the radiative recombination is a dominant decay channel of the dark excitons in CdTe/ZnTe quantum dots.

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“…We identified strong lines related to neutral exciton in the highest energy, trions in intermediate energies, biexction in lowest energy, and weaker lines associated with higher charged states 9,18,19 . Emission lines were identified by a combination of various methods: measurement of luminescence intensity as a function of excitation power, linear polarization anisotropy measurements (Fig.…”

Section: New Opportunities Coming From Low-density Of Dotsmentioning

confidence: 99%

“…6) and study of properties 17,18 almost all emission lines in broad µPL spectrum. This is unavailable without using additional treatments like mesas in usual samples.…”

Section: New Opportunities Coming From Low-density Of Dotsmentioning

confidence: 99%

Ultra low density of CdTe quantum dots grown by MBE

Kobak

Rousset

Rudniewski

et al. 2013

Journal of Crystal Growth

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This work presents methods of controlling the density of self-assembled CdTe quantum dots (QDs) grown by molecular beam epitaxy. Two approaches are discussed: increasing the deposition temperature of CdTe and the reduction of CdTe layer thickness. Photoluminescence (PL) measurements at low temperature confirms that both methods can be used for significant reduction of QDs density from 10 10 QD/cm 2 to 10 7 -10 8 QD/cm 2 . For very low QDs density, identification of all QDs lines observed in the spectrum is possible.

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Magnetophotoluminescence study of intershell exchange interaction in CdTe/ZnTe quantum dots

Cited by 40 publications

References 32 publications

Comparison of magneto-optical properties of various excitonic complexes in CdTe and CdSe self-assembled quantum dots

Comparison of magneto-optical properties of various excitonic complexes in CdTe and CdSe self-assembled quantum dots

In-plane radiative recombination channel of a dark exciton in self-assembled quantum dots

Ultra low density of CdTe quantum dots grown by MBE

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