The impact of position of Mn δ-doping on the formation of CdTe/ZnTe quantum dots with single magnetic ions

Gietka, Karol; Kobak, J.; Janik, E.; Rousset, J.-G.; Borysiuk, J.; Nawrocki, M.; Golnik, A.; Kossacki, P.; Pacuski, W.

doi:10.1016/j.jcrysgro.2014.01.080

Cited by 4 publications

(1 citation statement)

References 25 publications

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“…Our calculations illustrate how the position-dependent e-Mn and h-Mn exchange controls the light-hole exciton mixing which in turn changes the absorption spectra and the EXR oscillations. Let us stress that the Mn location can be experimentally controlled [25].…”

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confidence: 99%

Light-hole exciton mixing and dynamics in Mn-doped quantum dots

et al. 2016

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We investigate theoretically the spectral and dynamical effects of the short-range exchange interaction between a single manganese (Mn) atom hosted by cylindrical CdTe quantum dots and its light-hole excitons or biexcitons. Our approach is based on the Kohn-Luttinger k · p theory and configuration interaction method, the dynamics of the system in the presence of intraband relaxation being derived from the von Neumann-Lindblad equation. The complex structure of the light-hole exciton absorption spectrum reveals the exchange-induced exciton mixing and depends strongly on the Mn position. In particular, if the Mn atom is closer to the edges of the cylinder, the bright and dark light-hole excitons are mixed by the hole-Mn exchange alone. Consequently, their populations exhibit exchange-induced Rabi oscillations which can be viewed as optical signatures of light-hole spin reversal. Similar results are obtained for mixed biexcitons, in this case the exchange-induced Rabi oscillations being damped by the intraband hole relaxation processes. The effect of light-hole heavy-hole mixing is also discussed.

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Section: Introductionmentioning

confidence: 99%

Light-hole exciton mixing and dynamics in Mn-doped quantum dots

et al. 2016

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Distributed Bragg reflectors obtained by combining Se and Te compounds: Influence on the luminescence from CdTe quantum dots

Rousset

Kobak

Janik

et al. 2016

Journal of Applied Physics

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We report on the optical properties of structures containing self assembled CdTe quantum dots (QDs) combined with Te and Se based distributed Bragg reflectors either in a half cavity geometry with a relatively broad cavity mode or in a full cavity geometry where the cavity mode is much narrower. We show that for both structures the extraction coefficient of the light emitted from the QDs ensemble is enhanced by more than one order of magnitude with respect to the QDs grown on a ZnTe buffer. However, a single QD line broadening is observed and attributed to an unintentional incorporation of Se in the vicinity of the CdTe QDs. We show that postponing the QDs growth for 24 h after the distributed Bragg reflector deposition allows recovering sharp emission lines from individual QDs. This two step growth method is proven to be efficient also for the structures with CdTe QDs containing a single Mn2+ ion.

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Effect of electron-hole separation on optical properties of individual Cd(Se,Te) quantum dots

et al. 2016

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Cd(Se,Te) Quantum Dots (QD) in ZnSe barrier typically exhibit a very high spectral density, which precludes investigation of single dot photoluminescence. We design, grow and study individual Cd(Se,Te)/ZnSe QDs of low spectral density of emission lines achieved by implementation of a Mnassisted epitaxial growth. We find an unusually large variation of exciton-biexciton energy difference (3 meV ≤ ∆EX−XX ≤ 26 meV) and of exciton radiative recombination rate in the statistics of QDs. We observe a strong correlation between the exciton-biexciton energy difference, exciton recombination rate, splitting between dark and bright exciton, and additionally the exciton fine structure splitting δ1 and Landé factor. Above results indicate that values of the δ1 and of the Landé factor in the studied QDs are dictated primarily by the electron and hole respective spatial shift and wavefunctions overlap, which vary from dot to dot due to a different degree of localization of electrons and holes in, respectively, CdSe and CdTe rich QD regions.

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The impact of position of Mn δ-doping on the formation of CdTe/ZnTe quantum dots with single magnetic ions

Cited by 4 publications

References 25 publications

Light-hole exciton mixing and dynamics in Mn-doped quantum dots

Light-hole exciton mixing and dynamics in Mn-doped quantum dots

Distributed Bragg reflectors obtained by combining Se and Te compounds: Influence on the luminescence from CdTe quantum dots

Effect of electron-hole separation on optical properties of individual Cd(Se,Te) quantum dots

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