Tuning Between Quantum-Dot- and Quantum-Well-Like Behaviors in Type II ZnTe Submonolayer Quantum Dots by Controlling Tellurium Flux During MBE Growth

Ji, Haining; Roy, Bidisha; Dhomkar, Siddharth; Moug, Richard T.; Tamargo, M. C.; Wang, A.; Kuskovsky, Igor L.

doi:10.1007/s11664-013-2729-2

Cited by 4 publications

(13 citation statements)

References 14 publications

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“…The non-radiative times estimated in Ref. [33] are of order 0.1 -1 ns, would give parameter b ~ 10 -3 to 10 -4 , which is still at least factor of 5 smaller.…”

Section: Discussionmentioning

confidence: 81%

“…In our samples, within the temperature range of this experiment, the average PL lifetimes was determined to be between 50 and 100 ns [33]. This allows us to estimate [40], where electron-phonon effects on decoherence were addressed.…”

Section: Discussionmentioning

confidence: 90%

“…The stacks are formed due to a strong vertical correlation between the quantum dot containing layers [31,32]. The lateral separation between the QD stacks is much larger [33] than the size of the carrier orbit [34], allowing for the assumption that carriers orbit each stack independently. There are no magnetic impurities expected in these samples due to the nature of the growth procedure.…”

Section: Resultsmentioning

confidence: 99%

“…This sample exhibits emission due to QDs only (see e.g., Refs. [30,33] for PL from a set of samples that have both QD and isoelectronic bound exciton related emission), which allows for simple spectral integration. The result is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…by the destruction of the states with a well-defined angular momentum. In our model, therefore, while an electron and a hole are strongly coupled to form an exciton [33,37], the electron travels over longer distances outside of the dot than the confined hole and its probability to be scattered is much larger. Correspondingly, the magnitude of the AB peak decreases exponentially with the electron path length D, similar to the amplitude of the AB oscillations observed in transport measurements (e.g.,…”

Section: Discussionmentioning

confidence: 99%

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Decoherence in semiconductor nanostructures with type-II band alignment: All-optical measurements using Aharonov-Bohm excitons

et al. 2017

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We examine the temperature dependence of the visibility of the excitonic Aharonov-Bohm peak in type-II quantum dots. We obtain a functional temperature dependence, which is similar to that determined by transport experiments, namely, with T -1 term due to electron-electron collisions and with T -3 term due to electron-phonon interactions. However, the magnitude of the latter term is much smaller than that for the transport electrons and similar to the interaction strength of the exciton-phonon coupling. Such suppressed electron-phonon interaction ushers a way for all-optical studies of decoherence processes in semiconductor nanostructures as other dephasing mechanisms become more pronounced.

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“…The non-radiative times estimated in Ref. [33] are of order 0.1 -1 ns, would give parameter b ~ 10 -3 to 10 -4 , which is still at least factor of 5 smaller.…”

Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Decoherence in semiconductor nanostructures with type-II band alignment: All-optical measurements using Aharonov-Bohm excitons

et al. 2017

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Determination of lateral size distribution of type-II ZnTe/ZnSe stacked submonolayer quantum dots via spectral analysis of optical signature of the Aharanov-Bohm excitons

Dhomkar

Roy

et al. 2014

Journal of Applied Physics

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For submonolayer quantum dot (QD) based photonic devices, size and density of QDs are critical parameters, the probing of which requires indirect methods. We report the determination of lateral size distribution of type-II ZnTe/ZnSe stacked submonolayer QDs, based on spectral analysis of the optical signature of Aharanov-Bohm (AB) excitons, complemented by photoluminescence studies, secondary-ion mass spectroscopy, and numerical calculations. Numerical calculations are employed to determine the AB transition magnetic field as a function of the type-II QD radius. The study of four samples grown with different tellurium fluxes shows that the lateral size of QDs increases by just 50%, even though tellurium concentration increases 25-fold. Detailed spectral analysis of the emission of the AB exciton shows that the QD radii take on only certain values due to vertical correlation and the stacked nature of the QDs.

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Optical anisotropy in type-II ZnTe/ZnSe submonolayer quantum dots

Dhomkar

et al. 2016

Journal of Applied Physics

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Linearly polarized photoluminescence is observed for type-II ZnTe/ZnSe submonolayer quantum dots (QDs). The comparison of spectral dependence of the degree of linear polarization (DLP) among four samples indicates that the optical anisotropy is mostly related to the elongation of ZnTe QDs. Numerical calculations based on the occupation probabilities of holes in px and py orbitals are performed to estimate the lateral aspect ratio of the QDs, and it is shown that it varies between 1.1 and 1.4. The value of anisotropic exchange splitting for bright excitonic states is found to be ∼200 μeV from the measurement of the degree of circular polarization as a function of the magnetic field. The results also show that heavy-light hole mixing ratio is about 0.16.

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Tuning Between Quantum-Dot- and Quantum-Well-Like Behaviors in Type II ZnTe Submonolayer Quantum Dots by Controlling Tellurium Flux During MBE Growth

Cited by 4 publications

References 14 publications

Decoherence in semiconductor nanostructures with type-II band alignment: All-optical measurements using Aharonov-Bohm excitons

Decoherence in semiconductor nanostructures with type-II band alignment: All-optical measurements using Aharonov-Bohm excitons

Determination of lateral size distribution of type-II ZnTe/ZnSe stacked submonolayer quantum dots via spectral analysis of optical signature of the Aharanov-Bohm excitons

Optical anisotropy in type-II ZnTe/ZnSe submonolayer quantum dots

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