Exciton dynamics in individual semimagnetic (Zn,Mn)Te/(Zn,Mg)Te nanowires

Gałkowski, Krzysztof; Wojnar, P.; Janik, E.; Papierska, J.; Sawicki, Krzysztof; Kossacki, P.; Suffczyński, J.

doi:10.1063/1.4929822

Cited by 5 publications

(2 citation statements)

References 48 publications

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“…A similar effect on the field was previously observed in DMS structures and nanostructures, e.g., involving Mn 9,[109][110][111]. As in previous works,9,[109][110][111][112] we attribute the emission intensity increase to the magnetic field induced reduction of efficiency of non-radiative exciton recombination assisted by Auger excitation of the Fe 3+ ion. In the absence of the magnetic field, band carriers and the Fe 3+ ions are spin degenerate making efficiency of the Auger process independent of spin.…”

supporting

confidence: 86%

Fe dopant in ZnO: 2+ vs 3+ valency and ion-carrier s,p-d exchange interaction

Papierska,

Ciechan,

Bogusławski

et al. 2016

Preprint

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Dopants of transition metal ions in II-VI semiconductors exhibit native 2+ valency. Despite this, 3+ or mixed 3+/2+ valency of iron ions in ZnO was reported previously. Several contradictory mechanisms have been put forward for explanation of this fact so far. Here, we analyze Fe valency in ZnO by complementary theoretical and experimental studies. Our calculations within the generalized gradient approximation (GGA+U ) indicate that the Fe ion is a relatively shallow donor. Its stable charge state is Fe 2+ in ideal ZnO, however, the high energy of the (+/0) transition level enhances the compensation of Fe 2+ to Fe 3+ by non-intentional acceptors in real samples. Using several experimental methods like electron paramagnetic resonance, magnetometry, conductivity, excitonic magnetic circular dichroism and magneto-photoluminescence we confirm the 3+ valency of the iron ions in polycrystalline (Zn,Fe)O films with the Fe content attaining 0.2%.We find a predicted increase of n-type conductivity upon the Fe doping with the Fe donor ionization energy of 0.25 ± 0.02 eV consistent with the results of theoretical considerations. Moreover, our magnetooptical measurements confirm the calculated non-vanishing s,p-d exchange interaction between band carriers and localized magnetic moments of the Fe 3+ ions in the ZnO, being so far an unsettled issue.

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confidence: 86%

Fe dopant in ZnO: 2+ vs 3+ valency and ion-carrier s,p-d exchange interaction

Papierska,

Ciechan,

Bogusławski

et al. 2016

Preprint

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“…This is because excitons in wide-gap semiconductors exhibit high binding energy and high oscillator strength, which open a possibility of roomtemperature operation, and result in high efficiency of photon sources as well as strong coupling with photonic modes [13][14][15] . However, the suppression of excitonic luminescence resulting from addition of Mn 2+ ions to both bulk material and to the low dimensional structures was observed [16][17][18][19] . This is due to the opening of new, sensitive to the magnetic field, channels of non-radiative crossrelaxation of excitons leading to the excitation of the Mn 2+ ions 12,[20][21][22][23][24][25][26] .…”

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confidence: 99%

Origin of luminescence quenching in structures containing CdSe/ZnSe quantum dots with a few Mn2+ ions

et al. 2017

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We present a detailed spectroscopic study of the photoluminescence quenching in an epitaxial structures containing CdSe/ZnSe quantum dots doped with low concentration of Mn 2+ ions. Our time-resolved and time-integrated experiments reveal the origin of the quenching observed in macrophotoluminescence studies of ensembles of such dots. We show that incorporation of even a few ions to an individual dot does not quench its luminescence effectively, although some fingerprints of expected spin-dependent quenching are visible. At the same time, the presence of Mn 2+ ions in the sample significantly affects the luminescence intensity of the wetting layer, resulting in a quenching of the global luminescence from studied structure. On the other hand, the luminescence decay dynamics is found to be independent of the presence of Mn 2+ ions, which suggests that the observed quenching occurs for the excited excitonic states.

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Photoluminescence of CdTe quantum wells doped with cobalt and iron

Piotrowski

Pacuski

2020

Journal of Luminescence

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Exciton dynamics in individual semimagnetic (Zn,Mn)Te/(Zn,Mg)Te nanowires

Cited by 5 publications

References 48 publications

Fe dopant in ZnO: 2+ vs 3+ valency and ion-carrier s,p-d exchange interaction

Fe dopant in ZnO: 2+ vs 3+ valency and ion-carrier s,p-d exchange interaction

Origin of luminescence quenching in structures containing CdSe/ZnSe quantum dots with a few Mn2+ ions

Photoluminescence of CdTe quantum wells doped with cobalt and iron

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