Magnetic Field Effect on the Excitation Spectrum of a Neutral Exciton in a Single Quantum Dot

Molas, Maciej R.; Nicolet, A. A. L.; Piętka, B.; Babiński, A.; Potemski, M.

doi:10.12693/aphyspola.126.1066

Cited by 1 publication

(2 citation statements)

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“…shells, and the ground electron level, the s-shell, however, in the presence of an additional hole. 19,34,35 Moreover, the peak, appeared around ∼15.5 meV at B=0 T, lowers its energy with the magnetic field. As a consequence this peak has been attributed to the absorption process of excited state of the positively charged exciton, labelled X * + (1e p 1h p 1h s ), which involve absorption process of an electron from the p-shell level in the valence band to the p-shell level in the conduction band in presence of an extra hole on the s-shell (see Refs.…”

Section: Resultsmentioning

confidence: 98%

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Energy spectrum of confined positively charged excitons in single quantum dots

Molas¹,

Wójs²,

Nicolet³

et al. 2016

Phys. Rev. B

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A theoretical model, which relates the binding energy of a positively charged exciton in a quantum dot with the confinement energy is presented. It is shown that the binding energy, defined as the energy difference between the corresponding charged and neutral complexes confined on the same excitonic shell strongly depends on the shell index. Moreover, it is shown that the ratio of the binding energy for positively charged excitons from the p-and s-shells of a dot depends mainly on the nearly perfect confinement in the dot, which is due to the "hidden symmetry" of the multielectron-hole system. We applied the theory to the excitons confined to a single GaAlAs/AlAs quantum dots. The relevant binding energy was determined using the micro-photoluminescence and micro-photoluminescence excitation magneto-spectroscopy. We show that within our theory, the confinement energy determined using the ratio of the binding energy corresponds well to the actual confinement energy of the investigated dot.

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Section: Resultsmentioning

confidence: 98%

“…shells, and the ground electron level, the s-shell. 19,34,35 Such an attribution would explain the diamagnetic shift of the resonances. At high energies, the observed pattern of resonant peaks becomes extremely complex and the peaks can be hardly followed with the magnetic field.…”

Section: Resultsmentioning

confidence: 99%