Optical Aharonov-Bohm Effect in Type-II Quantum Dots

Sellers, Ian R.; Kuskovsky, Igor L.; Govorov, Alexander O.; McCombe, B. D.

doi:10.1007/978-3-642-39197-2_11

Cited by 2 publications

(1 citation statement)

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“…We note that the signal persists to above 27 K, indicating that the effect is very robust, which allows one to perform decoherence measurements by varying the temperature over two orders of magnitude. The peak (henceforth called the AB peak) at B AB ~1.38 T is due to EABE [36].…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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 Aharonov-Bohm Effect in Type-II Quantum Dots

Cited by 2 publications

References 43 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

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